LT1 ignition coil driver and ignition control module...same thing?
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
LT1 ignition coil driver and ignition control module...same thing?
When to the local Winn Dixie tonight in the 92 to get a few things. Can back out and it started up and ran for about 3 seconds and died. It will crank but not start. I am getting fuel but not spark at the plugs. I ran through the FSM and seems the ignition coil driver is bad. It has a 4 wire connector. All 4 wires tested good when troubleshooting. I get no spark from the ignition coil.
Says to check the connection at the coil driver (cleaned the connections good) or replace the coil driver. Is the coil driver and ICM the same thing? Looks like it from the online autoparts stores.
Says to check the connection at the coil driver (cleaned the connections good) or replace the coil driver. Is the coil driver and ICM the same thing? Looks like it from the online autoparts stores.
Pro
Joined: Oct 2004
Posts: 619
Likes: 1
From: Reno Nv
RRT, I just replaced one on my 92. Went thru the pricing BS. I saw prices from $95 to $165(dealership of course). I got one (AC Delco) from Corvette Central for $110 but it took over 2 weeks to get.
Your best bet is to go to your local AC Delco store, they'll probably still have to order it but it should be faster.
CC p/n 274562
From the AC Delco box: ACD# D1971A ( use this at an ACD store)
GM # 10483131
I forgot to add this - The ICM comes with thermal grease to coat the back when installing it, be sure to use it. Also, I had a different problem that your no start. My origional ICM was apparently working alright and the grease on the back was gone, just powdery residue.
Your best bet is to go to your local AC Delco store, they'll probably still have to order it but it should be faster.
CC p/n 274562
From the AC Delco box: ACD# D1971A ( use this at an ACD store)
GM # 10483131
I forgot to add this - The ICM comes with thermal grease to coat the back when installing it, be sure to use it. Also, I had a different problem that your no start. My origional ICM was apparently working alright and the grease on the back was gone, just powdery residue.
Last edited by Bill Hetzel; Jul 30, 2007 at 09:54 AM.
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Thanks for the tips. I just removed it and am going to have it tested. I found about the same prices online. The heat sink grease is just about non existant on the back of it. If it test good, I will get some grease and reapply.
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Pro
Joined: Oct 2004
Posts: 619
Likes: 1
From: Reno Nv
If you have to get a new one, it should come with grease, AC D does.
Thermal grease is a little hard to find, there was a thread on this 3 months ago.
I personnally would subistiture dielectric grease if I couldn't find thermal.
Thermal grease is a little hard to find, there was a thread on this 3 months ago.
I personnally would subistiture dielectric grease if I couldn't find thermal.
Safety Car
Joined: Jul 2001
Posts: 4,871
Likes: 15
From: Detroit's West Side MI
If you have Advanced Auto Parts store near you they carry the GP sorensen version for $75. It has a long warranty, I think he said 7 years?
I bought one yesterday but it doesn't appear to be my problem. If you can't find one let me know, I was going to just return it but could ship it for cost + shipping.
FWIW I've heard the tests they run on the ICM aren't especially reliable. Coils are quite cheap, it may be worth it to buy both and check the coil before plugging in the ICM. Did you check your resistances across the primary and secondary coils? If you get lucky and it's the coil you can return the more expensive ICM part.
I bought one yesterday but it doesn't appear to be my problem. If you can't find one let me know, I was going to just return it but could ship it for cost + shipping.
FWIW I've heard the tests they run on the ICM aren't especially reliable. Coils are quite cheap, it may be worth it to buy both and check the coil before plugging in the ICM. Did you check your resistances across the primary and secondary coils? If you get lucky and it's the coil you can return the more expensive ICM part.
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
I took the ICM and two spare used coils to two different Autozones (in different towns) and to a Advanced Auto Parts. None of them could test the ICM for me (didn't have the connection). The first Autozone tested the ignition coils to be good. GM wants $165.00 for a new one.
Wonder if there is a way I can bench test the ICM?
GMpartsdirect.com wants $87.xx for it, but wants $20 shipping. Thats just stupid.
Wonder if there is a way I can bench test the ICM?
GMpartsdirect.com wants $87.xx for it, but wants $20 shipping. Thats just stupid.
Drifting
Joined: Jul 2001
Posts: 1,296
Likes: 0
From: Largo Florida
Advanced Auto Parts tested my ICM and coil for me. Autozone has a lifetime warranty for their ICM at $71.99 for my 96. I think their coils are about $45 and I would not be surprised if there not lifetime too.
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Safety Car
Joined: Jul 2001
Posts: 4,871
Likes: 15
From: Detroit's West Side MI
Weird. What do you mean "turned you down?" They wouldn't do it, or don't have a tester? Murray's auto around here does it, do you have one nearby?
And you've probably thought of it already, but do you know anyone with a similar year car? It's easy to remove, put yours on another car and see if it runs...post here, there's bound to be someone nearby that will let you do it.
And you've probably thought of it already, but do you know anyone with a similar year car? It's easy to remove, put yours on another car and see if it runs...post here, there's bound to be someone nearby that will let you do it.
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Weird. What do you mean "turned you down?" They wouldn't do it, or don't have a tester? Murray's auto around here does it, do you have one nearby?
And you've probably thought of it already, but do you know anyone with a similar year car? It's easy to remove, put yours on another car and see if it runs...post here, there's bound to be someone nearby that will let you do it.
And you've probably thought of it already, but do you know anyone with a similar year car? It's easy to remove, put yours on another car and see if it runs...post here, there's bound to be someone nearby that will let you do it.
Team Owner
Joined: Oct 2000
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From: Fort Knox, KY
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If your new ICM doesn't come with it, you can get a tube of thermal grease from Radio Shack for $3.99.
Team Owner
Joined: Sep 2003
Posts: 25,295
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From: I'm the walkin dude I can see all of the world...
St. Jude Donor '03
Might be worth a try to disconnect the MSD adapter and try to run through the original ignition system.
This is really easy to do since the connections are snap togethers.
One less thing to troubleshoot.
This is really easy to do since the connections are snap togethers.
One less thing to troubleshoot.
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
You guys want freak'n believe this. I got a used ICM from my dad that was working when he took it off. I couldn't find anyone around here to test mine, so rather than purchase a new one, I decided to use a good spare.
I used dielectric grease on the back and installed it. I had the MSD box disconnected from the battery and tried to start the engine. Same thing...wound crank but not start. I connected the MSD back to the battery and same thing.
Feeling down on my luck, I decided to check the wiring at the ICM and it's good. I had loomed some of the wires when I got the car and started taking the loom off going to the MSD. Found that the ground wire for the MSD was disconnected. The wires apparently were just tied together and electric tape wrapped around it.
I couldn't find a butt connector big enough, so I just twisted the wire back together and turned the key and the engine started. I will have to get a connector for the wire. Might have to go over all the wiring to make sure it's together good.
Wiring problems will drive people crazy...especially me.
Problem solved.....for now. The best thing about it was I didn't spend a dime to fix it.
I used dielectric grease on the back and installed it. I had the MSD box disconnected from the battery and tried to start the engine. Same thing...wound crank but not start. I connected the MSD back to the battery and same thing.
Feeling down on my luck, I decided to check the wiring at the ICM and it's good. I had loomed some of the wires when I got the car and started taking the loom off going to the MSD. Found that the ground wire for the MSD was disconnected. The wires apparently were just tied together and electric tape wrapped around it.
I couldn't find a butt connector big enough, so I just twisted the wire back together and turned the key and the engine started. I will have to get a connector for the wire. Might have to go over all the wiring to make sure it's together good.
Wiring problems will drive people crazy...especially me.
Problem solved.....for now. The best thing about it was I didn't spend a dime to fix it.