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bad pcm?

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Old 08-04-2011, 09:05 AM   #1
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Default bad pcm?

I have been trying to diagnose a misfire issue and I am having no luck. 1995 zj with the 5.2L v8. I am wondering what the symptoms of a bad pcm are? My jeep is runs very rough and sometimes hard to start.

I have replaced cap, rotor, wires, plugs, coil, fuel filter, and nothing has worked.

1995 Jeep Grand Cherokee Orvis Edition Build
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Old 08-04-2011, 10:13 AM   #2
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1995 Grand Cherokee

There is a plate at the bottom of the intake manifold that has a gasket that can blow out and cause a vacuum leak and misfire. I highly doubt that the PCM is causing the problem. You may also want to check the fuel pressure, could be a weak pump.
Steering stabilizers will not cure or cause death wobble, they only mask the real problem that is causing death wobble. Oil pumps do not make pressure, they create flow. Bearing clearence and restrictions make pressure. It's the crank sensor.
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Old 08-04-2011, 09:13 PM   #3
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Mine had similiar symptoms, would be hard to start when hot. Was the crank sensor, will cause a misfire too.
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Old 08-06-2011, 07:42 PM   #4
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pcm's rarely go bad but are commonly blamed
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Old 08-06-2011, 07:42 PM
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