Will a defective PCM cause a misfire on one cylinder

Asked by Oct 24, 2016 at 09:35 PM about the 2001 Jeep Grand Cherokee Limited 4WD

Question type: Maintenance & Repair

have new coil and new plug and have already tried rotating and it works on all other cylinders

3 Answers

74,015

If PCM is bad it would give a random misfire,check the compression on the cylinder that is not firing,may have bad valve on it.

I have already pulled the new coil and put a new plug in it and grounded it and then started the engine...but no fire to the plug from the coil...could that still mean possablility of a low compression problem? If low compression can cause the coil not to fire, I will run a compression check in the morning if you still think so

74,015

No,if you do not have fire at that plug,there is a issue,may be bad spark plug wire,

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