ICM? Opti? Ideas?
Thread Starter
Le Mans Master
Joined: Dec 2000
Posts: 8,740
Likes: 2
From: Minneapolis MN
ICM? Opti? Ideas?
Figured I would start new new thread about my problem to outline in one post.
Was backing out for work the other day and the car died. Started back up and died again.
Fuel Pressure is good - 42 PSI
The two plugs I checked are getting spark
A month ago water pump went, replaced it, didnt do the opti.
I have an opti on the way but the idea of the icm going was brought up. Is their anyway to test the icm? Would be car die while backing up if the ecm went.
The car wasnt missing but it did seem to be low on power but that could also have been me getting used to it for the season.
No codes are showing up.
Its a 94 with 125k. I bought it with 65k and have never changed the opti and am not sure if it was changed before then.
Was backing out for work the other day and the car died. Started back up and died again.
Fuel Pressure is good - 42 PSI
The two plugs I checked are getting spark
A month ago water pump went, replaced it, didnt do the opti.
I have an opti on the way but the idea of the icm going was brought up. Is their anyway to test the icm? Would be car die while backing up if the ecm went.
The car wasnt missing but it did seem to be low on power but that could also have been me getting used to it for the season.
No codes are showing up.
Its a 94 with 125k. I bought it with 65k and have never changed the opti and am not sure if it was changed before then.
Last edited by n1kki6; May 11, 2006 at 10:09 PM.
Thread Starter
Le Mans Master
Joined: Dec 2000
Posts: 8,740
Likes: 2
From: Minneapolis MN
Just checked the compression and that is fine too.
Also a note that night before work it was pouring out and still raining in the morning when I backed out but I didnt drive it in the rain the night before.
Also a note that night before work it was pouring out and still raining in the morning when I backed out but I didnt drive it in the rain the night before.
Last edited by n1kki6; May 11, 2006 at 09:51 PM.
Advanced
Joined: Sep 2002
Posts: 50
Likes: 0
From: Kenosha WI
I feel for ya! If you check other threads on the Forum, you'll find some posts that say AutoZone can check your ICM - around here (SE Wisconsin), they can't or won't!
Does your Vette fire at all or are you dead in the water like me?
Does your Vette fire at all or are you dead in the water like me?
Thread Starter
Le Mans Master
Joined: Dec 2000
Posts: 8,740
Likes: 2
From: Minneapolis MN
Originally Posted by LT14FUN
I feel for ya! If you check other threads on the Forum, you'll find some posts that say AutoZone can check your ICM - around here (SE Wisconsin), they can't or won't!
Does your Vette fire at all or are you dead in the water like me?
Does your Vette fire at all or are you dead in the water like me?
Thread Starter
Le Mans Master
Joined: Dec 2000
Posts: 8,740
Likes: 2
From: Minneapolis MN
Originally Posted by Redeasysport
The FSM has detailed flow chart on testing the ICM that is how I confirmed my own diagnosis.The FSM is cheaper than throwing parts at it.
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Drifting
Joined: Sep 2003
Posts: 1,483
Likes: 4
From: middle TN
Originally Posted by n1kki6
Its so easy to get at I just picked one up, dude said it would be cool for me to throw it in and return it if its not it. After doing the coild the car is turning over much stronger it seems so hopefully the icm will fix it.
Thread Starter
Le Mans Master
Joined: Dec 2000
Posts: 8,740
Likes: 2
From: Minneapolis MN
Originally Posted by Scooter 94
That's good to know. I always thought there was no refund on electrical parts. Where'd you buy it?
Burning Brakes
Joined: Nov 2005
Posts: 848
Likes: 1
From: 1992 LT1 6 speed Cayman Islands
This could be the ICM ( among other things) if you have no spark and they usually die without any warning when they die.
Do not run the engine too long with the new one hooked up temporarely as they will burn out. The packet of white grease is an important part of this install and must be used or the ICM will overheat and burn out.
Do not run the engine too long with the new one hooked up temporarely as they will burn out. The packet of white grease is an important part of this install and must be used or the ICM will overheat and burn out.
Burning Brakes
Joined: Nov 2005
Posts: 848
Likes: 1
From: 1992 LT1 6 speed Cayman Islands
If you have spark then there is nothing wrong with your ICM.
If you have spark and fuel preassure then the problem seems to be that the ECM (computer) is not pulsing the injectors. Check the two injector fuses in the fuse boxes to see if one has blown.
If you have spark and fuel preassure then the problem seems to be that the ECM (computer) is not pulsing the injectors. Check the two injector fuses in the fuse boxes to see if one has blown.
Thread Starter
Le Mans Master
Joined: Dec 2000
Posts: 8,740
Likes: 2
From: Minneapolis MN
What about this though. He had spark and it was the icm.
http://forums.corvetteforum.com/show...7&postcount=15
Doesnt the icm have something to do with timing as well.
http://forums.corvetteforum.com/show...7&postcount=15
Doesnt the icm have something to do with timing as well.
Le Mans Master
Joined: May 2005
Posts: 7,340
Likes: 2,272
From: Central Maryland
Originally Posted by Jerris
If you have spark then there is nothing wrong with your ICM.
If you have spark and fuel preassure then the problem seems to be that the ECM (computer) is not pulsing the injectors. Check the two injector fuses in the fuse boxes to see if one has blown.
If you have spark and fuel preassure then the problem seems to be that the ECM (computer) is not pulsing the injectors. Check the two injector fuses in the fuse boxes to see if one has blown.
An engine needs three things to run:
1. Compression. This requires that the valve train is funcitoning correctly, etc.
2. Spark to the proper cylinders at the proper time.
3. Air and fuel in approximately the correct ratio.
You have compression.
You're getting spark to the plugs, and you're not getting backfiring/misfiring (or are you?). If there is no backfire/misfire, but rather only an apparent no-fire, it's unlikely to be an ignition-related fault.
You have fuel pressure. Good news. But are the injectors opening?
Be well,
SJW
Thread Starter
Le Mans Master
Joined: Dec 2000
Posts: 8,740
Likes: 2
From: Minneapolis MN
WHen its cranking it doesn not seem to be missing and its not backfiring. If I crank it for a while it sounds like it may miss once but I can't call it for sure. So I should check injector fuses. What else should I check injector related?
Thread Starter
Le Mans Master
Joined: Dec 2000
Posts: 8,740
Likes: 2
From: Minneapolis MN
The injectors must be opening though because the plugs have gas on them. Which makes me think the timing is off for some reason. I was backing out and it was fine, then killed. Restarted but wouldnt stay running. Now it just turns. At first it seemed like fuel but with the water pump just going I thought opti. On lunch I will check the injector fuses.
Last edited by n1kki6; May 12, 2006 at 11:38 AM.
Thread Starter
Le Mans Master
Joined: Dec 2000
Posts: 8,740
Likes: 2
From: Minneapolis MN
Does the icm control the timing at all or just amplify. I just read this post and am a little lost.
http://forums.corvetteforum.com/show...58&postcount=6
http://forums.corvetteforum.com/show...58&postcount=6