ignition problem
Thread Starter
Navigator
Joined: Feb 2014
Posts: 9
Likes: 0
From: Sweeny Tx
ignition problem
OK, found out that it was not a fuel delivery problem, but an ignition problem. I am not getting any fire between the plug wire and ground. I don't know where to start looking. Any help? I appreciate all the help troubleshooting what I thought was fuel. I know my fuel system now. I like to fix things myself if I can. I have old school skills, but I just don't know where everything is on this corvette. It's a 1993 LT1 with auto trans. Thanks in advance.
Advanced
Joined: Mar 2012
Posts: 55
Likes: 1
From: Salinas CA
Definitely invest in the manuals!
I recently had a no spark issue and found that I had no spark from the coil to the optispark. The wire checked out so next thing I did was remove the ICM and got it tested at autozone. Sure enough it was bad.
I recently had a no spark issue and found that I had no spark from the coil to the optispark. The wire checked out so next thing I did was remove the ICM and got it tested at autozone. Sure enough it was bad.
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 207
From: Orlando FL
Check for spark off the coil (not the plugs).
Check the coil fuse (10A) #25 (I think for the 93) in the passenger door.
Use a noid light to determine if the injectors are working when cranking. This will tell you a lot. If it is, then the opti is working and probably the ECM also.
In that case if the noid light lights, there is a possibility the ICM might be bad. An easy fix.
This is a start and only one approach to the problem but one of the simplest ones. If no noid light, then it gets more complicated.
Check the coil fuse (10A) #25 (I think for the 93) in the passenger door.
Use a noid light to determine if the injectors are working when cranking. This will tell you a lot. If it is, then the opti is working and probably the ECM also.
In that case if the noid light lights, there is a possibility the ICM might be bad. An easy fix.
This is a start and only one approach to the problem but one of the simplest ones. If no noid light, then it gets more complicated.
