Hot PCM when engine acts up
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Cargo Master
Joined: Apr 2001
Posts: 2,364
Likes: 3
From: Eustis FL
Hot PCM when engine acts up
It isn't a truck, but it is OBD II related; This is the place to go for the best help!
1995 Thunderbird, 4.6
I bought a scan tool, one that gives live monitoring. Engine runs great for about 4 minutes, scan tool showing no codes, none stored either. Pulled PCM out to where I can see it, start car and wait: PCM gets hot, then the car goes to fast idle, runs really rich, and fan kicks in. No pwer when you step on the pedal, just bogs down. I thought it was the PCM, but I replaced it today with a new one, and it does the exact same thing. What does the scan tool say when this happens? It instantly says 'operating error' as soon as the car acts up, no mode will work. What the heck is this? A bad ground wire? I've been messing with this thing for a week now, in every spare moment I have. I have a new fuel pump, filter, and regulator. I have a new IAC motor. I cleaned MAF meter... What gives?
1995 Thunderbird, 4.6
I bought a scan tool, one that gives live monitoring. Engine runs great for about 4 minutes, scan tool showing no codes, none stored either. Pulled PCM out to where I can see it, start car and wait: PCM gets hot, then the car goes to fast idle, runs really rich, and fan kicks in. No pwer when you step on the pedal, just bogs down. I thought it was the PCM, but I replaced it today with a new one, and it does the exact same thing. What does the scan tool say when this happens? It instantly says 'operating error' as soon as the car acts up, no mode will work. What the heck is this? A bad ground wire? I've been messing with this thing for a week now, in every spare moment I have. I have a new fuel pump, filter, and regulator. I have a new IAC motor. I cleaned MAF meter... What gives?
