post #16 of Old 05-27-2013, 01:48 PM Thread Starter
neonhomer
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1996 ZJ 
 
Join Date: Sep 2010
Location: Edgewater, FL
Posts: 470
Hmmm....


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NeonHomer
Mid-Florida Jeep Club - Member
1996 Jeep Grand Cherokee, 4.0L/42RE/242 - Rebuilt motor w/ Comp cam (4/12), 3.5" Junkyard F>R lift, 31x10.5.x15 M/T's, Spartan Locked D44a, TC & tank skids, F&R adj trackbars, V8 steering arms
Galaxy DX99V CB, 102" SS Whip, Yaesu FT-2900R 2m, Larsen 1/4w mag mount, Sony HU, Massive 3way - F Door, Pioneer 3way - R Doors, MB Quart ONX304 Subs (x2), Lanzar 1600w amp.

"No Matter Where You Go... There You Are."
"Oh me oh my a lovely day is dawning. Oh what a joy I didn't wake up dead. So I can go to work and then resume my yawning, and get my sleep on site instead of in my bed" - Daria Morgendorffer (with my twist)
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post #17 of Old 06-17-2013, 04:40 PM Thread Starter
neonhomer
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1996 ZJ 
 
Join Date: Sep 2010
Location: Edgewater, FL
Posts: 470
Well... I pulled the harnesses and cleaned them, and checked the pins. None seemed overly stretched.

I read somewhere that the Coil driver in the PCM is a failure point in these devices, but I am almost certain now the PCM is the fault.

Anyone know if there is a schematic or parts list for these devices for replacement parts? If I can get this damn potting off, I could probably replace the driver IC.

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NeonHomer
Mid-Florida Jeep Club - Member
1996 Jeep Grand Cherokee, 4.0L/42RE/242 - Rebuilt motor w/ Comp cam (4/12), 3.5" Junkyard F>R lift, 31x10.5.x15 M/T's, Spartan Locked D44a, TC & tank skids, F&R adj trackbars, V8 steering arms
Galaxy DX99V CB, 102" SS Whip, Yaesu FT-2900R 2m, Larsen 1/4w mag mount, Sony HU, Massive 3way - F Door, Pioneer 3way - R Doors, MB Quart ONX304 Subs (x2), Lanzar 1600w amp.

"No Matter Where You Go... There You Are."
"Oh me oh my a lovely day is dawning. Oh what a joy I didn't wake up dead. So I can go to work and then resume my yawning, and get my sleep on site instead of in my bed" - Daria Morgendorffer (with my twist)
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post #18 of Old 06-17-2013, 07:14 PM
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Posts: 8,550
The fuel pressure fluctuating between 42-50 at idle is bordering on abnormal. I would take dellis advise a watch the pressure while driving.

Also, the connector at the coil can cause the code you have. Pull the red tab out and disassemble the connector. Squeeze the sides of the sockets in a little to tighten the fit up. i know this isnt an optimal method of doing things, but it works. You can check the fit before you reassemble.

Another approach... you can eliminate different circuits by back pinning into connectors, run wires to a meter thorough passenger window, drive it and watch the meter. If you have a diagram and the time to tinker with it, you can use the process of elimination.

You are correct that he coil driver is a weak point in the PCM. PM JS97zj , he may have a source for some of the internal parts or point you in the right direction. he has writeup on here for resoldering the connections on the board.
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