@fixitmr. The early 90's GM cars used a "bypass" style of ECM. The ICM actually runs the engine during cranking and for a few minutes during warm up when everything is in a default cold engine setting. Then hands over the engine to the ECU/PCM after the sensors are coming online. Early Ford EFI engines had a similar system.
@saturntech9 That is a very interesting question. At first I want to say "Duh" there would be signal if the starter is cranking. And then my brain kicks in and tells me wellllll, there is a chance that the solenoid sticks but the signal has stopped. This is something I'm going to have to check. But it starts 30 times normal before doing this.
Then there is the fact that I just got an email from Scotty Kilmer (dot-com). He said that the signal wire is direct to the starter and definitely does NOT go thru the ICM or the ECU. This is a fairly low mileage rebuilt starter so I'm just flustered over this whole car.
Anywho, I've rebuilt a hundred GM starters and can do it with my eyes closed. I'll just go through it and put on a Borg Warner solenoid.
Thanks guys :)
Wednesday, March 14th, 2012 AT 6:49 AM