After Replacing an Idnition Control Module
Thread Starter
Racer
Joined: Feb 2001
Posts: 381
Likes: 8
From: NORTH WEST PA
After Replacing an Idnition Control Module
After replacing the ignition control module on an LT1 are there any other procedures that need to be performed?
For example disconnect the battery to reset the computer. Or is it just plug and play?
Thanks in advance for your input!
Brian
For example disconnect the battery to reset the computer. Or is it just plug and play?
Thanks in advance for your input!
Brian
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
You shouldn't have to disconnect the battery. Do, however, use the thermal grease between the ICM and mounting bracket. If you can't find the thermal grease or it didn't come with the new ICM, you can use dielectric grease. If you use neither, the ICM won't last long.
Thread Starter
Racer
Joined: Feb 2001
Posts: 381
Likes: 8
From: NORTH WEST PA
No codes at all ... before, during or after the failure.
Just started running like crap while going up a long hill. I pulled over seemed to idle okay, turned around went back down the hill and then it quit.
My best guess is the ICM fires the coil when instructed by the ECM, so performance should not have been effected.
Just started running like crap while going up a long hill. I pulled over seemed to idle okay, turned around went back down the hill and then it quit.
My best guess is the ICM fires the coil when instructed by the ECM, so performance should not have been effected.
Last edited by RED92LT1; Aug 2, 2007 at 01:41 PM.
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
The ignition module is capable of providing both 4X and 360X timing pulses each crankshaft rev. Using these timing pulses the ECm processes ignition spark timing and sends an EST signal to the ignition module to acirvate the secondary ignition system. The ECM provides power, ground, and 5v reference voltages to the ignition module. A ref signal is generated each time the ECM detedts that the ref voltages have been grounded by the ICM. When the ECM detects ref signals, ignition timing can be processed.
Since the engine is running, I believe the ICM is ok. You might have a different problem going on. Like say lack of fuel pressure, injector probs, ESC system detecting knocks, weak coil, poor ECM grounds, low alternator output, restricted exhaust, ect.
Since the engine is running, I believe the ICM is ok. You might have a different problem going on. Like say lack of fuel pressure, injector probs, ESC system detecting knocks, weak coil, poor ECM grounds, low alternator output, restricted exhaust, ect.
Thread Starter
Racer
Joined: Feb 2001
Posts: 381
Likes: 8
From: NORTH WEST PA
Thanks, RRT for the detailed information. The car was running fine before failure of the module. I just wanted to be sure the module did not control timing or need any thing else to sync up with the ECM.
It has a slight miss at cruising speeds but I do need to replace plug wires.
Thanks for your help!!
Brian
It has a slight miss at cruising speeds but I do need to replace plug wires.
Thanks for your help!!
Brian
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