PCM bad???
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PCM bad???
1997 150xlt x cab 4.2L V6
Symptoms:
1. Runs great until coming to operating temp then goes rich and wants to stall.
2. Friend's analyzer says no power to any of the O2 sensor heater circuits.
3. All fuses intact.
4. No visible shorts in harness
Background:
Not my daily driver. Only use the truck to haul equipment once in a while. Ran great in November/early December. Took it out last week. Warmed it up for a good 30 minutes. Started sputtering a few miles down the road. Thought it was old/bad gas so I filled it with Premium and Fuel Stabilizer. Drove another mile or so and it died. Towed it home but had to move it off the street better. Came out an hour later and it fired right up! Yesterday, I took it to the store. Ran great until it warmed up and nursed it home.
A friend came out with an analyzer and it showed that none of the O2 sensor heaters were operating but the wiring and fuses look good. I suspect that the PCM is corroded inside. There has been a leak in the back window for quite some time and it's actually been raining raining like hell in GA lately. All of the windows were saturated with thick condensation and there is a lot of visible corrosion on the tab that mounts the PCM to the kick board. (Also: Window switch on driver side quit working since the last time on the road...)
Where do I go from here?
Thanks in advance!
Symptoms:
1. Runs great until coming to operating temp then goes rich and wants to stall.
2. Friend's analyzer says no power to any of the O2 sensor heater circuits.
3. All fuses intact.
4. No visible shorts in harness
Background:
Not my daily driver. Only use the truck to haul equipment once in a while. Ran great in November/early December. Took it out last week. Warmed it up for a good 30 minutes. Started sputtering a few miles down the road. Thought it was old/bad gas so I filled it with Premium and Fuel Stabilizer. Drove another mile or so and it died. Towed it home but had to move it off the street better. Came out an hour later and it fired right up! Yesterday, I took it to the store. Ran great until it warmed up and nursed it home.
A friend came out with an analyzer and it showed that none of the O2 sensor heaters were operating but the wiring and fuses look good. I suspect that the PCM is corroded inside. There has been a leak in the back window for quite some time and it's actually been raining raining like hell in GA lately. All of the windows were saturated with thick condensation and there is a lot of visible corrosion on the tab that mounts the PCM to the kick board. (Also: Window switch on driver side quit working since the last time on the road...)
Where do I go from here?
Thanks in advance!
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I finally got back off the road and got around to changing the FPR. Still the same symptoms only now we've discovered that there's no spark after it stalls and a new twist. The truck will rough idle and stalls when it's put in the following gears: D, 1 and N. She'll only rough idle in 2 and R. Now our attentions have turned to the coil packs or the Crank Position Sensor. Seems to me that if the reed switch in the sensor were bad, it wouldn't start at all. But I don't know?
What are the symptoms of a bad coil pack?
Throwing a P0320 code...
What are the symptoms of a bad coil pack?
Throwing a P0320 code...
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