Mechanics

P0351 - AGAIN..

1997 Jeep Laredo

Electrical problem
1997 Jeep Laredo 6 cyl Two Wheel Drive Automatic 144k miles

Been having problems lately with vehicle stalling or losing power to a near stall. Within the past 2 months I've replaced the battery, thermostat, -ignition coil-, cap, rotor, pickup coil, crankshaft sensor cleaned the throttle body with carb cleaner (there was a lot of carbon deposit build-up), had cables/contacts cleaned with electrical cleaner & the last thing I tried was backing out 1/4 of the way the 2 torx screws from the cover of the pcm (I read in a fourm that the screws from the factory are too long and can cause a short in the PCM). Which backing out the screws seems to have worked at least for several weeks no stalling or hesitation. Although I still noticed a low and rough idle accompanied with slight bucking/shudder on occasion when vechicle shifts gears (I believed this to be a vacuum leak). It still hasn't stalled, but today it did loose power to a near stall for 2-3 seconds, no check engine light. Luckly I had my scanner with me hooked it up planning on recording data if the problem reoccured (which it didn't). Except it showed the DTC P0351 (Fault at ignition coil primary/secondary) not a pending code either, I'm not sure why the check engine light did not come on. What I am thinking is that possibly I need to back out the screws from the pcm a little more. Maybe the screws were still in a little too far and still caused a short. I didn't know though if that short in the pcm would cause a false code, the ignition coil is less than 2 months old so I seriously doubt it's already gone bad. So can a short in the pcm cause a false DTC? What else could cause the DTC P0351 other than the ignition coil?

A few day after originally writing this, the Jeep did stall at a red light but cranked right back up. Hooked it up to the scanner when I got home and was now getting P0351 and P0300 (multiple/random misfire detected)
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24csintx
April 9, 2008.




Check the PCM ground wire (BLK/Tan) on the right side of the engine, clean it up and resecure it.

Merlin2021
Apr 14, 2008.
I'll try that either tonight when I get home or tomorrow. Do I need to disconnect the negative battery cable first?

Tiny
24csintx
Apr 14, 2008.
I would.
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Merlin2021
Apr 14, 2008.

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