I posted a thread recently about how the MAP sensor keeps failing every few months on my N* in my 1994 Concours. It does not matter which brand I put in, all crap out the same. This obviously leads me to believe it is something other than the MAP sensor causing the failure.
Edit: Let me reiterate that changing MAP sensor fixes problem for few months. Then the sensor dies after a few months. Replacing completely fixes problem...and the cycle repeats.
Lately, I have been getting P070 codes that seem to be related to random stalls at slow speeds. Cleaned throttle body clean as a whistle, replaced TPS and there is no difference. Code still comes back.
Even more recently, P026 has cropped up and stalls are more frequent and immediately following a stall, difficult to start. Stalls happen even at 40 MPH.
But I can go days without ANY symptoms. Car drives like it should.
I had a mechanic run diagnostic trees on the code. All the wires and TP sensor checked out fine. He didn't want to tell me to replace PCM and be wrong. I have the FSM and for P026, and that pretty much points to replacing PCM since the wires are good.
I am a complete newbie about PCM replacement. I really feel this is what needs to be replaced to fix these problems.
First: Am I wrong?
Second: I don't need the car to last too much longer. Will going cheap on a PCM be a bad idea or should I DEFINITELY go AC Delco?
Third: It seems to me that none of the replacement PCMs come with a PROM. Does this mean I can easily use my existing PROM?
Thanks for helping me. I'm really ignorant on what PCM failure looks like. And lucky enough to have never experienced it before I guess.
Edit: Let me reiterate that changing MAP sensor fixes problem for few months. Then the sensor dies after a few months. Replacing completely fixes problem...and the cycle repeats.
Lately, I have been getting P070 codes that seem to be related to random stalls at slow speeds. Cleaned throttle body clean as a whistle, replaced TPS and there is no difference. Code still comes back.
Even more recently, P026 has cropped up and stalls are more frequent and immediately following a stall, difficult to start. Stalls happen even at 40 MPH.
But I can go days without ANY symptoms. Car drives like it should.
I had a mechanic run diagnostic trees on the code. All the wires and TP sensor checked out fine. He didn't want to tell me to replace PCM and be wrong. I have the FSM and for P026, and that pretty much points to replacing PCM since the wires are good.
I am a complete newbie about PCM replacement. I really feel this is what needs to be replaced to fix these problems.
First: Am I wrong?
Second: I don't need the car to last too much longer. Will going cheap on a PCM be a bad idea or should I DEFINITELY go AC Delco?
Third: It seems to me that none of the replacement PCMs come with a PROM. Does this mean I can easily use my existing PROM?
Thanks for helping me. I'm really ignorant on what PCM failure looks like. And lucky enough to have never experienced it before I guess.