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| ARman72 | 93 running issues | ||
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Guru Newb
 
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SORRY FOR THE LONG POST
Ok guys this is my 1st post, I am new here so let me give you alittle back ground on the car. Its a 1993 bone stock 60,000 miles. I replaced the opti a few years ago. The opti has never been wet or anything like that. Here is the issue last fall i was driving the car at night to work and it died and it wouldnt start. So i left it went back at lunch it started right up so i took it home got my Daily driver. After this issue it sat for the winter well after a few months I got the car out had the tranny serviced. Thinking it was ready to go took it out for a drive and it died going down the road. So I thought ok its gotta be the ICM I replaced it and the coil. Took it out ran great till it gets to operating temp (180-190) and if you nail the gas it dies, it will start right back up after it sits for about 5 mins. So i replaced the fuel pump and filter. Still same issue runs great at low temps but after it hits operating temp it will die when u nail the gas and will restart after it sits. Also just FWIW it will also do this sitting in the drive way in park. Sorry for the long post. I am no expert or a repair guru lol, But there is no check engine light, havent pulled code dont have a code reader. Please help thanks in advance. |
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Posted on: 2011/6/18 13:06
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| Ultraman | Re: 93 running issues | ||
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Posted on: 2011/6/18 13:11
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| BillH | Re: 93 running issues | ||
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The Stig Moderator
 
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Welcome to the forum.
The nice thing about a 92-93 is you don't need a code reader, just a paper clip. Go to our tech library, and under Engines is the info on how to pull all the codes up on the dash, it's esay to do. Suggest you print it out. Sounds like that car runs on in Open Loop (cold) and the problem occurs when you hit Closed Loop. You need to check for codes before you can do anything else. Do you have a fuel pressure gauge? |
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Posted on: 2011/6/18 13:35
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| ARman72 | Re: 93 running issues | ||
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Guru Newb
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thanks guys for the welcome
No BillH i dont have one. will it throw out codes without a check engine light? |
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Posted on: 2011/6/18 13:41
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| BillH | Re: 93 running issues | ||
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The Stig Moderator
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Quote:
Yes, codes w/o a check light are possible. You really need to do the procedure before we can give the problem some more thought. You can borrow a F/P gauge from one of the parts stores but you need to pull the codes first. I have a 92 Factory Service Manual that will be very close to your 93. |
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Posted on: 2011/6/18 13:49
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| ARman72 | Re: 93 running issues | ||
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Guru Newb
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ok thanks ill pull them after i read the tech library section.
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Posted on: 2011/6/18 13:52
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| ARman72 | Re: 93 running issues | ||
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ok no codes.....got some H but no C
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Posted on: 2011/6/18 14:33
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| 1Fast04Vert | Re: 93 running issues | ||
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Elite Guru
 
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I know you just replaced the ICM, but everything points to it being the culprit. Might be a good idea to check for spark when it is not starting (hot).
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Posted on: 2011/6/18 14:43
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| ARman72 | Re: 93 running issues | ||
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I took the new ICM off, before i did the fuel pump, and it checked out good.
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Posted on: 2011/6/18 14:45
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| bogus | Re: 93 running issues | ||
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Grand Imperial Pooh-Bah
 
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This is my fave to blame... the ICM HARNESS.
This happened to the former owner of a 93 Vette several years ago. It would do exactly what you are reporting. What was happening, due to age, the ICM harness assembly to and from the ICM to the coil had deteriorated to the point where it wasn't staying tight inside the sockets any more. In short, the weather pack connector ends were dead. The plastic would get soft and the metal would lose contact. |
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Posted on: 2011/6/18 15:34
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| BillH | Re: 93 running issues | ||
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The Stig Moderator
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List the H codes for us. What happens is that when you turn the key off, most codes go from C to H (History). Write the H codes down, than clear all the codes so you can see if they come back. |
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Posted on: 2011/6/18 16:20
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| ARman72 | Re: 93 running issues | ||
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Guru Newb
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1.H 74
4. H 16 |
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Posted on: 2011/6/18 20:53
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| ARman72 | Re: 93 running issues | ||
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You its funny you said that i thought it seemed kinda loose when i replaced it. Cant you get replacement harness? |
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Posted on: 2011/6/18 20:57
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| bogus | Re: 93 running issues | ||
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Grand Imperial Pooh-Bah
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Rockauto has as ton of connectors... you can always make one.
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Posted on: 2011/6/18 21:33
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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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| ARman72 | Re: 93 running issues | ||
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LOL I am not so sure i could make one. Can you give me a run down of what all i would need to make one>?
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Posted on: 2011/6/19 4:31
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| bogus | Re: 93 running issues | ||
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Grand Imperial Pooh-Bah
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oh, exciting. We have found your problem - H16. The opti is dying a slow death. H16 is the low-res signal, this means that the fuel delivery is getting messed with. It happened to mine and the car runs like crap when it happens. Code 74 is a dimming issue with the LCD... nothing to worry about. Reset the codes and see if they come back. |
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Posted on: 2011/6/19 5:52
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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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| ARman72 | Re: 93 running issues | ||
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Guru Newb
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Ok does this mean its not the ICM connection?
Ok I went out this AM and cleared the codes now it shows --- on 1,4,9.....No H,C's...So now i just drive it till it dies, right? Will it throw a code when it dies? will it show like a H16 when i paper clip it again after it dies? Sorry for all the questions just wanna understand and get this thing fixed.. |
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Posted on: 2011/6/19 9:39
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| ARman72 | Re: 93 running issues | ||
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Ok just got back from a drive it died again, also the H16 came back after i pulled the codes again....
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Posted on: 2011/6/19 12:00
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| BillH | Re: 93 running issues | ||
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The Stig Moderator
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What "brand" opti is in there now? Guys have had problems with the inexpensive ones on ebay.
A code 16 is usually the opti. However, it can also be the wiring. Do you have a digital voltmeter that you can use to test the harness? If you do, I can wrire up a quick "how to". |
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Posted on: 2011/6/19 12:27
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| ARman72 | Re: 93 running issues | ||
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No i dont have a voltmeter, I know i need to invest in some tools for working on this car. I know the stock opti went out and i did buy the replacement one on ebay. However when the stock one went out it would act up right from the get go. I know the opti can act many strange ways and not always the same when its on the verge of death lol.
A another Vette owner i know said the wires going into the opti could be the issue.. |
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Posted on: 2011/6/19 12:33
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| BillH | Re: 93 running issues | ||
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The Stig Moderator
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Yea, opti's can all act differently when they go out. Mine hickuped for 4 months before it even threw a 16.
Voltmeters are inexpensive, you can pick one up anywhere, Sears, Pep Boys even Home depot. You can get an OK one for less than $20. If you plan to keep the car, get a Factory Service Manual. I'll try to scan the 2 pages from the manual in a bit but usually they are hard to read. But, I have to wake up first, it's early here.  |
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Posted on: 2011/6/19 12:41
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| ARman72 | Re: 93 running issues | ||
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Guru Newb
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Hey i know i been up since 4 here in Arkansas....I wanna thank you guys for all your help...
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Posted on: 2011/6/19 12:43
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| BillH | Re: 93 running issues | ||
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The Stig Moderator
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These just don't come out well.
Attach file:  Code 16a.jpg (0.00 KB) Code 16.jpg (0.00 KB) |
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Posted on: 2011/6/19 13:11
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| BillH | Re: 93 running issues | ||
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The Stig Moderator
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You may be able to save them as a photo on your computer and enlarge them.
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Posted on: 2011/6/19 13:12
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| ARman72 | Re: 93 running issues | ||
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Guru Newb
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Yea i just did its pretty easy to read after you blow them up... Thanks .....
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Posted on: 2011/6/19 13:13
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| BillH | Re: 93 running issues | ||
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The Stig Moderator
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I'm supprised it worked.  |
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Posted on: 2011/6/19 13:16
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| ARman72 | Re: 93 running issues | ||
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Guru Newb
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WOW, Thats like reading Chinese to me LOL.
I read it, but dont understand it ...... ok your the guru, would you say the opti is doing lunch with the grim reaper? lol |
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Posted on: 2011/6/19 13:20
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| BillH | Re: 93 running issues | ||
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The Stig Moderator
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It's possible. Yea, the FSM takes some getting used to. On the chart, item #2, follow the ignition on/off instructions, disconnect the opti connector ( the one mounted on the right side of the engine). Terminal "A" will be the black/red wire. Set the voltmeter to 20 volts, hook the voltmeter red wire clip to this pin (the harness that goes back towards the firewall) then hook the black voltmeter to ground. Turn on the IGN and see what the voltmeter reads. |
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Posted on: 2011/6/19 13:33
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Every man dies but not every man lives. |
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| biggrizzly | Re: 93 running issues | ||
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2011 Memorial Day Car Show Winner!
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Bill, your a saint!
@ ARman, welcome to the Guru! You're in good hands here! |
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Posted on: 2011/6/19 13:56
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| ARman72 | Re: 93 running issues | ||
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WOW i cant even get to the opti from the top side.! Any suggestions
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Posted on: 2011/6/19 17:03
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| 1Fast04Vert | Re: 93 running issues | ||
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Elite Guru
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The wires from the opti are just a short pigtail that plugs into the harness under the passenger side fuel rail cover.
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Posted on: 2011/6/19 17:15
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2004 Vert. 475hp. Built by Vengeance Racing |
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| bogus | Re: 93 running issues | ||
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Grand Imperial Pooh-Bah
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I had one case where the wires to the opti were corroded.
This requires unplugging the harness to the opti at the opti! The harness plugs in on the right side, below the throttle body and kinda under the waterpump. And yes, the FSM takes getting used to. If you need a new opti, either get an MSD unit, Dynaspark or GM Delco. I have the Dynaspark, and a pot load of other tricks I will explain when I am not walking out the door.  |
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Posted on: 2011/6/19 18:19
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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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| BillH | Re: 93 running issues | ||
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The Stig Moderator
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Quote:
Yea, I forgot about that one on the GM units. The voltage test should be run at both connectors. |
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Posted on: 2011/6/19 20:22
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Every man dies but not every man lives. |
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| ARman72 | Re: 93 running issues | ||
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Guru Newb
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Ok guys my work week is over back to the car. LOL, If i replace the opti it should correct my issue>? right?
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Posted on: 2011/6/22 19:19
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| bogus | Re: 93 running issues | ||
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Grand Imperial Pooh-Bah
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I would confirm the condition of the harness first. If the leads area corroded in any way, they could cause a false code.
If you need to replace: 1. DynaSpark 2. MSD 3. GM Delco Don't waste money on cheap assed opti kits. Rebuilds/remans are a waste of time and money. |
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Posted on: 2011/6/22 20:03
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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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| jaa1992 | Re: 93 running issues | ||
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Guru
 
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Andy,
Actually some of the stuff I've read about the recent Dynaspark's would make me leary of them. The MSD appears to be OK if you open them up and locktite the screws that hold down the wheel and rotor. Which may be over the OP's comfort level. My 383 and the used iron head LT1 I put in my 92 I'm able to use the later style opti and after 6 months of track days the Summit Racing opti has held up just fine. And I'm not eating ICMs any more The AC/Delco isn't positively vented so modifying it to an active vent may also be outside your comfort level. Where in AR are you - maybe there is a guru near you that can help. I know 5 years ago when I replaced the opti on my original 92 engine it was a little intimidating - especially getting the balancer off the hub. I was able to get one of the last original Dynaspark optis and did not have a problem until the engine just got too tired. |
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Posted on: 2011/6/22 22:34
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| ARman72 | Re: 93 running issues | ||
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Guru Newb
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Yeah I know bogus something tells me its something other then the opti being totally junk, but i am no mechanic. I think there is a 85% chance its the harness but man i am at a total lose! I would love some guru close by to offer a helping hand. I can do simple jobs like replacing ICM, fuel pump, coil, but the whole opti harness/unit it selfs alittle over my head. |
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Posted on: 2011/6/22 23:53
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| 1Fast04Vert | Re: 93 running issues | ||
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Elite Guru
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Reread the two pages that Bill posted from his FSM. With a $15 DVOM and less than an hour you can determine if it is the opti of something else. I would be glad to help in person, but Arkansas is a bit far.
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Posted on: 2011/6/23 2:01
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