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| bogus | [UPDATED: 8 Feb 2012] Status on my 1992 Coupe | ||
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Grand Imperial Pooh-Bah
 
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Back ground: 1992 LT1/MN6 Dynaspark opti LTCC, reads optical data, fires appropriate GM Denso made coil from the LS1. Taylor Wires New NGK platinum plugs Fuel Filter replaced in May. EGR failed, causing car to run like shit. This is interesting... After replacing the EGR, my 92 ran great for a few days. Then it started knocking and missing again... found a loose plug wire (#1). I reseated the suspect wire into the coil, all fine. Then yesterday, the knock is back and its running like shit, again! Now this is where shit gets weird... I was trying to track down the miss, when I touched the right distributor harness, it smoothed out... so I need to check that! I am really leaning towards a bad fuel pump... I think it has been a secondary problem for some time. So a new pump it is! |
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Posted on: 2011/11/18 3:01
Edited by bogus on 2012/1/6 2:09:43 Edited by bogus on 2012/1/6 2:10:58 Edited by bogus on 2012/1/31 21:08:59 Edited by bogus on 2012/2/9 3:19:45 |
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| TommyT-Bone | Re: Fix one thing... and the car runs crappy again... | ||
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Chair-man of the bored
 
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Hopefully that will do it. If not ........... I know that diagnosing the problem and fixing the issue is the order of the day but it appears that throwing parts at it may have some benefit. Especially if a part is suspect. Good luck Andy though luck has nothing to do with it.
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Posted on: 2011/11/18 3:12
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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Well... I just realized stupid might... duh...
10 days ago, the battery went dead. Left the lights on. I don't think I have had to refuel since then, so the trip at 107 is a LIE... and my gas gauge is a lie... so I may just be out of gas. That or the time I drove one a bad EGR actually trashed something inside the engine. At some point, a fix must finally stick here... |
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Posted on: 2011/11/18 8:28
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Matatk | Re: Fix one thing... and the car runs crappy again... | ||
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Webmaster
 
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You could always try putting the gasoline on the outside of the car and accidentally dropping a match?
OK, back to the problem. I don't understand why if you touched the distributor harness and it smoothed out, you'll replace the fp? I can understand if you want to replace it for other reasons (ie, 170,000 miles and you want peace of mind), but that logic doesn't follow. I guess once you refill the tank and test it out, things might be better. But if you're low anyway, maybe you've got a bunch of crud in the tank and it is blocking the strainer. Could be something to check out. Matthew |
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Posted on: 2011/11/18 12:27
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| TommyT-Bone | Re: Fix one thing... and the car runs crappy again... | ||
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Chair-man of the bored
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Tip of the day.
Never run your tank below a quarter of a tank. Refuel often .... unless your going to the track (autocross, dragstrip) .... Then 1/4 to 1/2 should be more than enough. |
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Posted on: 2011/11/18 12:51
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| BillH | Re: Fix one thing... and the car runs crappy again... | ||
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The Stig Moderator
 
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Good luck, Andy.
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Posted on: 2011/11/18 13:54
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| Woodstock | Re: Fix one thing... and the car runs crappy again... | ||
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Senior Guru
 
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Quote:
I can understand if you want to replace it for other reasons (ie, 170,000 miles and you want peace of mind) This is why I have been stocking up on fuel pumps lately. Pretty scary what I got to see, and the Vette only had about 60K on it, but look for yourselves. Just to point out, this is a well cared for Vette. I guess, the strainer and tank just have never been touched, like in many Vettes. I wonder how long these contacts (not sure how the black things with springs are called in English) are to begin with? Considering Andys mileage, the pump should pretty much have had it. Attach file:  Benzinpumpe-Ummantelung.jpg (138.45 KB) 9.jpg (51.81 KB) 5.jpg (155.86 KB) 2.jpg (65.01 KB) 3.jpg (96.85 KB) |
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Posted on: 2011/11/18 15:27
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91 convertible |
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| TommyT-Bone | Re: Fix one thing... and the car runs crappy again... | ||
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Chair-man of the bored
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Holy crud!
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Posted on: 2011/11/18 15:46
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| Woodstock | Re: Fix one thing... and the car runs crappy again... | ||
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One more, because it looks real bad, but that's how it looked, before I took the motor apart.
This is a stock Delco pump out of a 90 Vette. Click on the pics for even scarier images. Attach file: Benzinpumpe-Ventil2.jpg (122.58 KB) |
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Posted on: 2011/11/18 15:47
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91 convertible |
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| BillH | Re: Fix one thing... and the car runs crappy again... | ||
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The Stig Moderator
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Quote:
Brushes, Axel. With that much crud, were the springs even pushing them against the rotor? |
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Posted on: 2011/11/18 16:41
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Every man dies but not every man lives. |
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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I doubt mine is that bad, but, replacement pumps have been treating me poorly.
The OEM lasted a long time; then died. I have been replacing the damned things about every 2 years! This one was put in in either 2008 or early 2009. When the pump fails, its like its out of gas and the drive gets very "brittle", if you know what I mean. I have a new racetronix unit from Lingenfelter coming in. Wasn't any more expensive than the other shit I have bought! I am going to gas up the Vette shortly. |
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Posted on: 2011/11/18 17:00
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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Ok... added gas (5g), still running like shit.
It is having a hard time holding an idle. I rev it up, fairly ok, but at idle, its piffing and buffing... I am going to go back out in a bit and confirm all plug wires are where they belong. Can't overlook the easy stuff!! |
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Posted on: 2011/11/18 18:59
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| pianoguy | Re: Fix one thing... and the car runs crappy again... | ||
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Wow, I'm gonna order a fuel pump just on general principles!
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Posted on: 2011/11/18 19:29
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1996 LT4 �Before you criticize someone, you should walk a mile in their shoes. That way when you criticize them, you are a mile away from them and you have their shoes.�- Jack Handey |
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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Something is seriously amiss... I just don't know what yet.
As I said, I am going to check things out some more. I will get back shortly. |
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Posted on: 2011/11/18 20:12
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Woodstock | Re: Fix one thing... and the car runs crappy again... | ||
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Senior Guru
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Thanks Bill on the brushes, it can be so easy when you know it
 . The clean surface tells me though, that was the only good thing about the condition. Than again, the pump held up for about 20 years, not bad.@ Andy, can you make another scan with TunerPro or Datamaster and upload the ald/uni file, that might help to see what's going on. About the condition of the pump, I had it in a dry airtight plastic box for about 5-6 month before I took it apart. That surely contributed to the corrosion. The crud was there for sure but probably got worse with storage. So take Tommys advise "tip of the day" serious and don't let it sit for too long with an empty gastank. |
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Posted on: 2011/11/18 20:21
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91 convertible |
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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ok... plug wires are not crossed... no misfire that way.
I am going to go out with some brake cleaner later and clean all the harness ends to the coils. Just to be sure, and re-secure grounds for the coils. |
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Posted on: 2011/11/18 20:27
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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Quote:
I plan on that as soon as I am done with the cleaning of the harness. Expect that tomorrow. |
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Posted on: 2011/11/18 20:28
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Matatk | Re: Fix one thing... and the car runs crappy again... | ||
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Good luck. Keep us posted.
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Posted on: 2011/11/19 0:55
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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it sounds funny at idle... like its puffing and huffing to keep running. I can hear the IAC making adjustments...
I am wondering if all the games with the EGR didn't flood either one, or both, cats with too much fuel, causing them to ultimately melt down and fail. |
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Posted on: 2011/11/19 6:34
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Matatk | Re: Fix one thing... and the car runs crappy again... | ||
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Did you pull the battery cable and reset the ecm after to correct your fuel tables? |
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Posted on: 2011/11/19 12:41
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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oh. yea... a couple of times.
I am also going to do an ECM swap, just to be sure. I am concerned that the backfiring, the fuel richness... all of it, didn't conspire to kill one or both of the cats. That's my fear. Also, when I was checking stuff, I found that the fuel pressure dropped off REAL fast... so now I can honestly suspect the pump. It wasn't pumping strong, in my opinion, anyway... I have a small Autometer gauge on the fuel rail. |
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Posted on: 2011/11/19 16:33
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| PLRX | Re: Fix one thing... and the car runs crappy again... | ||
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Senior Guru
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I had that issue when I bought the Dynacrap. I replaced it with the MSD and all issues disappear. I love to bash their product every time I read that word anywhere. Dynacrap=Crap-Crap-Crap |
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Posted on: 2011/11/19 23:51
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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I would expect it to throw a code if it was the cause of the problem.
Any one have a GenI opti I can borrow? |
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Posted on: 2011/11/19 23:53
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| PLRX | Re: Fix one thing... and the car runs crappy again... | ||
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Senior Guru
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I had a new Duynac and no codes. Your diagnosis is exactly what I had. I wish I had the old OEM opti for you to have, I threw it away.
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Posted on: 2011/11/20 0:46
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| jonszr1 | Re: Fix one thing... and the car runs crappy again... | ||
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did you say your fuel pressure was dropping off quickly? could you have a leaky injector ?. do the standard c4s when doing a pressure ck at the schrader valve hold pressure after turning the key off like the zr1s do .gosh this hasnt bee your month .
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Posted on: 2011/11/20 4:41
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i have a blast playing with my 4 babies 2 zr1s and 2 mustangs 68 coupe with a jon bennit 408 art car fully rollered c4 with a gearvendors over drive .88 mustang built by my kids with a ported lt5 and a bill boudreau blue printed zf 6 spd. with these 4 ... |
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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When the fuel pressure drops off, that normally means the check valve in the pump has failed or is failing.
I doubt the injectors are the problem. They are only 2 years old Bosch III from FIC. They are literally the last things I will suspect. |
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Posted on: 2011/11/20 6:05
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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Quote:
Thanks, but I need a GenI opti. Our Optis are not compatible. I have sent an email to Bob at Dynaspark... I will be curious what I learn. There seems to be one major difference... the other folks had their cars just die, mine runs like shit. I have a few other ideas churning in my head... |
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Posted on: 2011/11/20 6:05
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Woodstock | Re: Fix one thing... and the car runs crappy again... | ||
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Senior Guru
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Well, since your fuel pump isn't that old, did you check the connections at the pump?
You had this lean condition and I was pretty certain, that would be fixed now with the new EGR. TunerPro data should confirm that. If it's still lean, I am leaning towards fuel supply. I had a buddy, where the hose on top of the pump got torn by the pressure. |
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Posted on: 2011/11/20 11:35
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91 convertible |
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| lltrevino | Re: Fix one thing... and the car runs crappy again... | ||
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Guru Newb
 
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Fuel pressure drop problem is where I would look. Either sticky injector, of bad fuel regulator is my vote.Diagnosis is in order.Clamp the fuel lines test, will tell you alot. Obviously pressure line clamp only, than clamp return line only. If memory serves right, and pressure holds when return is clamped, FPR is culprit. Check Manual, has test in it. Also could pull the rails, and energize pressure and check for leaky injector.
Problem more on a cold start???/ |
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Posted on: 2011/11/20 17:27
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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I can't do much today... the weather is icky... raining hard and quite cool, if not cold! Ok... it's 58 and raining its ass of. That's good enough reason to stay inside.
Back to the fuel issue. I have the TPiS AFPR. I think it is suspect, too... I also have a spare FPR that I can swap and test with. I am replacing the fuel pump... I suspect the Autozone fuel pump is junk... namely that it's from Az... ugh... junk shit if there ever was. But when you are dealing with a dead part, you get what you can and start moving again. This time, I think the part is failing. I am aware of the harness failures of the fuel pumps, but the last time I was in there, mine looked really quite good, but that is about 3 years ago. I am also reaching out to the LTCC guy... I am going to ask if he can check my unit and make sure it's up to standard. Just a diag check. I can't do that and I am willing to eat the postage both ways just to get it checked. I am sure it's ok, his system has a good reputation, but right now, I am grasping at anything I can't categorically test. |
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Posted on: 2011/11/20 22:20
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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New fuel pump in, running real nice.
Still sounds funny... then I found what is in the picture below. It's about 1/2" cubed. Attach file: GuessWhat.jpg (635.66 KB) |
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Posted on: 2011/11/22 1:13
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| TommyT-Bone | Re: Fix one thing... and the car runs crappy again... | ||
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Chair-man of the bored
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You found Chex in the fuel tank?
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Posted on: 2011/11/22 1:18
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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ooh.. good one, Tommy...
Lemme give a hint... I found this below the right muffler. |
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Posted on: 2011/11/22 1:29
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| TommyT-Bone | Re: Fix one thing... and the car runs crappy again... | ||
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Chair-man of the bored
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Ooh,Ooh ......... I know this ..........
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Posted on: 2011/11/22 1:48
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| pianoguy | Re: Fix one thing... and the car runs crappy again... | ||
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Guru Emeritus
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Is it a chunk of catalytic converter innards?
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Posted on: 2011/11/22 1:53
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1996 LT4 �Before you criticize someone, you should walk a mile in their shoes. That way when you criticize them, you are a mile away from them and you have their shoes.�- Jack Handey |
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| pianoguy | Re: Fix one thing... and the car runs crappy again... | ||
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Guru Emeritus
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Quote:
Cat Chex :-P |
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Posted on: 2011/11/22 1:55
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1996 LT4 �Before you criticize someone, you should walk a mile in their shoes. That way when you criticize them, you are a mile away from them and you have their shoes.�- Jack Handey |
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| bogus | Re: Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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Quote:
yup. I am assuming that the fuel dumping, along with the back firing, blew the damned thing up. one or both. Will learn more later... |
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Posted on: 2011/11/22 1:58
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Woodstock | Re: [UPDATED] Fix one thing... and the car runs crappy again... | ||
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Man, I feel for you. Seems like one step forward and two back. Hang in there, your break will come. At least it's not the Opti again.
 Maybe a good idea to attach this thread for future reference to the previous troubleshooting? I always hate to read 50+ posts that lead to an open end. |
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Posted on: 2011/11/22 12:29
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91 convertible |
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| Matatk | Re: [UPDATED] Fix one thing... and the car runs crappy again... | ||
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Time for bullet cats, I guess!
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Posted on: 2011/11/22 12:38
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| 1Fast04Vert | Re: [UPDATED] Fix one thing... and the car runs crappy again... | ||
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Elite Guru
 
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If you need it I have the right side factory cat off my 95 available, but shipping certainly won't be cheap. I already sold the driver's side cat, so I only have the passenger side available.
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Posted on: 2011/11/22 13:19
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2004 Vert. 475hp. Built by Vengeance Racing |
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| tjpreul | Re: [UPDATED] Fix one thing... and the car runs crappy again... | ||
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Elite Guru
 
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If you want factory cats I have the ones from my car. I haven't checked them out yet. They should be off of the car this weekend.
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Posted on: 2011/11/22 14:34
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Vegas wasn't built on winners. '92 auto, MSD, Banski, Taylor wires, SS lines, C5 rims, 3.07 gears, white gauges, seats from a '96. Motor: Forged rotating assy, Probe pistons, CC valvetrain, AFR heads, Procharger P1SC |
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| bogus | Re: [UPDATED] Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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Thanks, guys! I have a pair of cats that I can use... so I am not in major trouble...
I am going to swap them tomorrow. TJ - how many miles on your cats? The factory ones start to fail at about 110k miles and are usually done by 130k. |
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Posted on: 2011/11/22 17:14
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| bogus | Re: [UPDATED] Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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Quote:
That is a good idea. Once I put this to bed, I will merge the two threads and update the original post with that fact and some other relevant data. |
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Posted on: 2011/11/22 17:15
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| tjpreul | Re: [UPDATED] Fix one thing... and the car runs crappy again... | ||
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Then mine are better than new. They only have 143k. |
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Posted on: 2011/11/22 21:44
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| bogus | Re: [UPDATED] Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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ah... 143k, huh...
 thanks for the offer, tho!! check out cat recyclers... they give upto about $40 per for our type of cat. |
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Posted on: 2011/11/23 1:14
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| tjpreul | Re: [UPDATED] Fix one thing... and the car runs crappy again... | ||
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Thats where they are going!! |
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Posted on: 2011/11/23 1:19
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| bogus | Re: [UPDATED] Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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yup! mine will be there too!
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Posted on: 2011/11/23 2:29
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| bogus | Re: [UPDATED] Fix one thing... and the car runs crappy again... | ||
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Grand Imperial Pooh-Bah
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I am slowly getting my head wrapped around this mess.
Yesterday, I finished replacing the cats and with the new fuel pump the car started up and ran BRILLIANTLY. Sounded nice and quiet - meaning no exhaust leaks. Just as it should. A little burble out the pipes, and the expected smoke from some PB Blaster used to separate the old right cat from the pipe. Nothing at all unexpected. After it idled for about 5-7 minutes, the idle lost it, the chugging was back, the idle was all over. I would hit the gas and it would stumble before catching up. So now I have a potential heat soak issue. I am aiming at the following: ECU failure plug wire failure coil failure Dynaspark failure LTCC brain failure I am going to replace the ECU and plug wires. If it still does it, I will then test each coil. The LTCC does have its own error coding system, but the engine needs to be running to see it and I must get the lid off... which is pickled with RTV! The last time I tried, it wasn't all that cooperative... Before I remove the Dynaspark and the LTCC, I will run another datalog and post. This is assuming I haven't found the problem some other way. I would not be surprised if a coil has failed. Nearly three years ago now, I was driving home and the serp belt exploded. It took out the original LTCC harness. This, I know, bent some pins on at least 1 if not 2 coils. I had to straighten them out. I am wondering if that didn't break something internally and it has taken this long to manifest. |
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Posted on: 2011/11/26 15:36
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Matatk | Re: [UPDATED] Car still runs badly... | ||
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Webmaster
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Well, that's good and bad. Some issues sorted, so at least those are out of the way. Can you get your hands on a stock opti?
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Posted on: 2011/11/26 19:24
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| bogus | Re: [UPDATED] Car still runs badly... | ||
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Grand Imperial Pooh-Bah
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No one seems to have one laying around, so no stock opti's.
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Posted on: 2011/11/26 19:29
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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