Join Date: Mar 2019
Feedback Score: 0 reviews
GSR not starting after changing ICM, fuel and spark present
Hey guys, so I've got something really weird going on with my GSR.
I had just replaced the ICM, although the donor was from an older D series I believe, but I heard it shouldn't matter. Got it all hooked up, went to start the car, and as soon as I turned the key all the way, all the power died and the starter didn't even try to engage. Just like a power outage. When I removed the key and tried to start it again, I couldn't even get accessory power. A few minutes of fiddling under the hood later while the key was in the ignition with the door open, I might've moved a battery cable or something and heard the beep warning from the cabin. Tried starting again, and exactly the same thing happened. At this point I put back the old ICM, which still worked, just happened to be giving me some trouble I believe. I still couldn't get any power, as the magic that happened before didn't happen again.
So I went to the fuses under the dash, found the ignition fuse, and although the fuse wasn't blown according to a multimeter, swapping it out fixed the power loss issue. However, instead now I'm having something stranger happen; every time I try to start it, the starter makes a very strange, loud screeching sound, not the typical cyclic sound of a good starter but a constant screeching until I let off the key. Also, every time, about a second into holding the key down, there's a single weird almost drum-like (or 'bass-y' water droplet) sound that I believe is coming from the exhaust; it seems like fuel and spark is fine from my tests, so maybe that's just a byproduct of fuel and spark being present.
Basically, I'm lead to believe something's up with the starter, but I really don't understand how changing the ICM in the distributor can cause what sounds to be a mechanical starter issue. Besides that, ECU? But again I'm not sure that would be causing the symptoms I'm having. Any leads and tips are welcome!