All Posts (Woodstock)
Re: Check Valve in fuel system |
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The fuel return line is next to the pump, no check valve there!
On your first pic is the fuel gases line, going to the charcoal canister located under the left headlight.
Posted on: 2012/7/21 9:36
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Re: Check Valve in fuel system |
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Another pic of the pump for better orientation:
Attach file:  Benzinpumpe-Ummantelung.jpg (138.45 KB)
Posted on: 2012/7/20 19:56
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Re: Check Valve in fuel system |
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Loosing pressure over time is totally normal!
Just last week I did a pressure test on my 91. After I had the engine running, pressure stayed at 43 PSI for a few minutes and dropped off to 39 at the 30 minute mark. At 1 hour it was down to 26 PSI, after 90 minutes at 21 and in 3 hours down to 8 PSI. With a cold engine pressure seems to drop off a little quicker. If I let it sit for a couple of weeks,I still get a few drops out of the Schrader valve when pushing in the pin. Here's a picture of the check valve of the pump. The right valve is the feed line. The left must be a high pressure relief valve. Attach file: Benzinpumpe-Ventil.jpg (83.88 KB)
Posted on: 2012/7/20 19:54
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Re: Whats the best oxygen sensor 1993 lt1 |
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I like Delco best. Just don't buy at RockAuto, they sell the Bosch O2 in a Delco box.
Posted on: 2012/7/17 20:35
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Re: ARGH!!!! The damned stumble is back! UPDATED: Now with Data Logs! |
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The fuel/air average (BLM) is looking real lean. GM is shooting for 128 +/-10, above is lean and below rich.
The ECM is fighting this suspected lean condition with some real high injector pulse width milliseconds. With injector M/S that high, it could be almost a rich stumble caused by an overreaction. BLM is maxing out at 160 on top and 108 at the bottom. Your BLM values are real close to max all the time. The IAC is sometimes all the way closed, but not all that bad to suspect a real bad false air issue. What injectors do you got? The yellow Bosch from FIC?
Posted on: 2012/7/17 20:31
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Re: My 89...new tint and paint detail |
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Only the rear can be done. As far the driver, the cops would still like to be able to count nose-hair while driving or at least see the bird while I am flipping it
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Posted on: 2012/6/16 12:50
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Re: Down 100 rwhp . |
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Coming from the old C4 programming, at 9V the PCM would actually make up for it by dumping in more fuel by means of opening the injectors longer and more often.
There is a chart for injector base pulse width vs. battery voltage, should be the same in a C6. Just not a 100% certain, if battery or pump voltage is the main factor for this scalar. At least it would explain the lower mileage. Too much fuel is actually just as bad for HP!
Posted on: 2012/6/16 10:17
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Re: My 89...new tint and paint detail |
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Man, that is soooo coooool!
I really envy you guys, what you can do to your cars. A tint like that would be perfect for me, since I have a hard time to control my fingers. 
Posted on: 2012/6/16 10:11
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Re: ARGH!!!! The damned stumble is back! |
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If you want me to send you a different memcal for testing, let me know.
Posted on: 2012/6/11 16:20
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Re: code 33 |
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Is it just me, or anyone else thinking that fp is way too low?
A 90 shouldn't have pressure under 40 psi at any time! I'd look into that first.
Posted on: 2012/5/1 20:39
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Re: So I bought a car that can't be registered, need advice... |
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If it isn't too exotic with a lot of mods, send it over here.
You'd just need to make sure that customs clears it for export and of course a title is required.
Posted on: 2012/4/19 11:55
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Re: Happy with my 89! |
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That is so kind of you to remember, glad I could help.
Mick gave me a few pointers, too, when I started burning my own chips. He's the man!
Posted on: 2012/3/26 14:44
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Re: Coolant Fan on/off Temps |
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Depends if you want to switch thermostats? The original opens at 195°F. In that case I wouldn't go below 196° off, and on at about 202°.
With a 180° stat and GA climate, I'd probably go 10° lower on both.
Posted on: 2012/3/5 23:12
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Re: New Problem - Hard Starting LT4 |
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Check fuel pressure. A friend with an 88 had similar symptoms and asked me to replace the injectors. We checked resistance and for leakage, but the injectors were fine.
Replacing the fuel pump solved the issue.
Posted on: 2012/3/5 23:00
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Re: Interesting side effect... |
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Quote:
Ign timing is of course vital. I would think, this MPG increase is a combination of many factors. On top of my list would be cracked headers, correct timing, correct fuel pressure and the EGR valve. Computers in cars is a good thing, but often you have to think around corners. False air calls for a lean condition, but the computer is trying to correct things and making it actually way rich. A carbed engine would be simply lean, not so a computer controlled engine. The ECM will ramp up injector flow to correct lean O2 readings. Still good to hear that the final fix is holding up. Good job Andy!
Posted on: 2012/3/5 10:29
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Re: FUEL RETURN LINE |
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How about putting it first in a pot with boiling water?
Posted on: 2012/2/25 12:24
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Re: 95 starts but dies in about 15 seconds |
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You could check the ECM/CCM fuse. Other than that from experience it's usually the ECM that's shot with these kind of DTCs.
Posted on: 2012/2/20 3:04
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Re: [Weird Question #??] How Long Are Power Antenna Leads? |
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I've got an old 88 antenna and a spare 91, which looks different. The 88 may be like yours? It measures 60 inches from the tip of the plug up to the antenna motor.
The inside part is 27", which leaves 33" for the outside. It came from a coupe btw. If you like pictures to compare, let me know.
Posted on: 2012/2/18 22:20
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Re: OBD1 "Mystery timing"??? |
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Earlier L98 engines like 2° advance across the board a lot, not so much the LT1.
LT1 stock engines rarely show spark knock. I figured the spark table must be on the conservative side, but no gain could be achieved by advancing timing. The LT1 owner couldn't feel a difference, so we pulled it out again. Bosch injectors require some adjustments in PW correction vs. battery volts, because they have a lower resistance. I doubt anything can be done to the injector itself.
Posted on: 2012/2/12 14:29
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Re: Grab a cup of coffee! My C4 problem. |
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Quote:
said something about computers not communicating with one another Just fixed a similar problem on a 92 with a memcal swap. Pretty much same symptoms, speedo acting up, ASR light coming on from time to time and limp home mode. Any members in your club with 92 or 93 Vettes to swap memcals? Is yours auto or stick?
Posted on: 2012/1/11 20:51
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Re: Sad Day Wrecked the Vette insurance isnt gonna cover it oh well |
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Do you got the name and address from the drunk? Hard to believe, but here in Germany almost everybody got personal liability insurance.
I.E., you hit a car with your bicycle and you*re covered. You cut a tree and it hits your neighbors house, you're covered. All kinds of stupid stuff is covered and it doesn't even cost a lot. On the other hand, you are a victim and German insurance companies have a pool to cover those sort of accidents. On the other hand it's always a 50/50 chance if your case qualifies. Since your insurance seems to be American, probably no chance to get anything out of the German pool.
Posted on: 2012/1/3 16:23
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Re: [UPDATED] Car still runs badly...VICTORY? [31 Dec 2011] |
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Amazing what you can find at youtube. This might help in the future.
http://www.youtube.com/embed/5-wJH-KUFsM A little late, ironically this came up when your video was finished. Quite interesting this coil stuff.
Posted on: 2012/1/1 22:27
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Re: [UPDATED] Car still runs badly...VICTORY? [31 Dec 2011] |
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I should have googled first, prior to posting my question.
I was not familiar with LTCC, but here's a good link http://www.lt1howto.com/articles/coilpack.htm
Posted on: 2012/1/1 18:20
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Re: [UPDATED] Car still runs badly...VICTORY? [31 Dec 2011] |
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Happy New Year guys.
So far the best news of the year  Andy, what did you do to your car, needing LS coils and still an Opti? Pics would help 
Posted on: 2012/1/1 13:57
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Re: Need HELP !!! |
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Happy New Year guys.
Didn't the LT1s have an issue with the brake fluid being too low?
Posted on: 2012/1/1 13:52
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Re: Ive just about had it....... |
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Could be just a small thing. I once had a loose MAP sensor bracket. Sounded like a piston would jump out through my hood, real scary. In my mind I was already putting in a new engine. What a relief that was. Mojo your way.
Posted on: 2011/12/30 1:34
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Re: 90 ..just does not have it...? |
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Check resistance of all 8 injectors hot and cold and report back.
Posted on: 2011/12/27 18:00
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Re: fuel gauge |
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or as in call? .....Pinocchio
Posted on: 2011/12/21 21:32
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Re: Things that make you go Day-Um! |
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Quote:
the intake looks uh pointless, but scary By no means pointless, you do know Jeff Dunham?
Posted on: 2011/12/14 9:34
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Re: 87 tps voltage |
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Correct value at idle is 0.53V - 0.55V, because I was never able to hit the suggested 0.54V
Posted on: 2011/12/13 17:33
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Re: C4 ride height? Frame to Floor |
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Sorry, misunderstanding on my part.
I measured the ride height from floor to bottom. The chassis should be an inch higher. On the other hand, if memory serves well, there are no spacers for the x-frame in the front, just 4x about one inch high spacers in the rear, but not 100% sure.
Posted on: 2011/12/11 23:07
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Re: C4 ride height? Frame to Floor |
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Every once in a while this question came up, because of Coupe owners wanting to install the cross frame of the convertible, so I once measured my 91 convertible with stock height.
Without the frame it's 13cm metric. Where it's mounted on the side the frame take up 2.3cm, but in the middle of the car it's a little bent and takes up roughly 3cm. Gives me a ride height of 10cm or roughly a little less than 4 inches.
Posted on: 2011/12/11 21:41
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Re: [UPDATED] Car still runs badly... |
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The promised data log would be helpful
 Wouldn't the opti be bad right from the get go or at least when restarted hot?
Posted on: 2011/12/5 16:02
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Re: [UPDATED] Car still runs badly... |
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Quote:
My only problem... and this is what bugs me... is that it seems to be heat related now. It starts, it runs great, then after about 5 minutes, it falls apart and starts to run poorly. Where is your latest log? This sounds like a bad O2 sensor. No way telling with just a screenshot, I'd need to see the ald file. You did swap ECMs, didn't you?
Posted on: 2011/11/27 19:41
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Re: 1979 Porsche 928 Clutch Kit |
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Sorry, I only saw this now. Germany nevertheless is a high price land and as usual more expensive than the promised land
 A quick search revealed, apparently only 3 dealers can deliver and one of those orders his parts once a month from the US.  http://www.pff.de/porsche/board104-po ... /2710352-kupplung-928-s3/ Who wants to start exporting parts for German cars to Germany 
Posted on: 2011/11/23 20:59
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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.
Posted on: 2011/11/22 12:29
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Re: Fix one thing... and the car runs crappy again... |
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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.
Posted on: 2011/11/20 11:35
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Re: Fix one thing... and the car runs crappy again... |
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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.
Posted on: 2011/11/18 20:21
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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)
Posted on: 2011/11/18 15:47
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Re: Fix one thing... and the car runs crappy again... |
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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)
Posted on: 2011/11/18 15:27
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Re: does the 165 computer need a different knock sensor? |
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84-86 part# 10456287
87-89 part# 10456288 Actually you should be fine, since 86 also uses the 7165 ECM! I burned a couple of chips for 86 using the later 88 and 89 MAF bins, thus far no problems with knock retard. I know for sure, the 90-91 sensor is extremely sensitive!!! I do get 8-10° spark knock but never heard a thing to really confirm this data. I just learned to live with it in my 91. Don't want to give up on my low end torque. 
Posted on: 2011/11/4 14:51
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Re: 90 C4 performance degrades the longer it runs |
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Quote:
but something is holding it in although the torx screws are removed There are 2 screws from the inside, one on each side. Left is in the rear part, covered by the distributor. Right is in front, covered by the egr solenoid.
Posted on: 2011/11/2 17:10
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Re: Spark Knock is back.... and I figured out why... And it's BACK AGAIN!!!! |
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Way to go, congrats on a tough one!
I never came across a bad EGR, hence no experience with such a fault. This has been a nice learning experience, thanks for sharing your diagnostics.
Posted on: 2011/10/27 22:01
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Re: Props for Woodstock! |
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I have to protect my investment from greedy bankers and the state, it's loaded with Beck's beer but don't tell
 . Always on the run on the Autobahn . . . . . . Actually, that photo is no fake, it cost me an antenna.
Posted on: 2011/10/26 11:11
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Re: Spark Knock is back.... and I figured out why... And it's BACK AGAIN!!!! |
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I then started to move the car, with the brake on, and it all of a sudden started to run like crap again... load flat out kills it. Could you make another log file and see if it's still lean? You might also want to try to get some action from the brake in your recording and see if depressing the brake will increase your lean condition. If it's still lean, I'd think your on to something with the fuel pump. When ordering, don't forget to order a new strainer, Delcos come without it. Take a look at the fuel lines prior to ordering, though. Maybe the pulsator slipped off slightly? Where is it actually backfiring, plenum or exhaust? Good luck, man.
Posted on: 2011/10/26 11:03
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Re: Props for Woodstock! |
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You're very welcome, but remember your karma? It's not days end yet. I sure hope, your way home will call for one of these
Posted on: 2011/10/25 17:53
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Re: Spark Knock is back.... and I figured out why... And it's BACK AGAIN!!!! |
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Did you reset the ECM, or in other words, was the battery disconnected while you were working on the car?
The stored ECM values could have been so far off, that it takes a small relearning effort to get in line for the good stuff. The values in TunerPro showed lean, but the ECM was dumping a lot of fuel, making it actually way rich. When diagnosing this stuff, you often got to think around corners. You might just needed to get the cat and O2 up to operating temperature to clear off the excess fuel. Sure sound strange. Good luck for your way home!
Posted on: 2011/10/25 17:49
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Re: Top Speed on my '89 |
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German Autobahn, come in and find out
 Depends on your rear end, the 2.59 with AT should make 230kmh/146mph in 3rd and 245kmh/152mph in 4th. Ignition timing makes a little difference, too. About 5kmh can be lost or found. The LT1 has been reported with 270-275kmh.
Posted on: 2011/10/25 11:27
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Re: Spark Knock is back.... and I figured out why... And it's BACK AGAIN!!!! |
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Come on...a little faith in your own work
I didn't think your manifolds would be swiss cheese in California climate  Bad ignition would make it run rich. You're on the right track here.
Posted on: 2011/10/24 16:28
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Re: Spark Knock is back.... and I figured out why... And it's BACK AGAIN!!!! |
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MAP Volts is the regulation the MAP does, and works fine.
Barometric pressure is the surrounding pressure in the air, 100 kPa at sealevel and the weather (high or low) plays a role. Probably only measured at start up, just like coolant temp at start up.
Posted on: 2011/10/24 11:21
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