95 Grand Cherokee Limited, 5/0L V8, Auto Trans, All Wheel Drive.
After 15 years of flawless performance:
The iginition coil keeps burning out in this beast leaving me stranded in the desert, miles from any help. This recurring failure has happened for the fourth time now.
Two days ago, my mechanic replaced the Distributor Cap, Rotor, Pickup Sensor, Crank Position sensor, and installed the ignition coil for the 4th time in the last two months. This time we modified the ignition harness with a pigtail for a 1998 version coil.
Based on the recommendation we received from Jeep, the previous coil had problems in the two-pin connector and the 98 mod eliminates the reliability problem in the control connector.
The beast ran fine for ONE DAY locally around town after these last repairs. Then, last night on my way home from work, the ignition died at freeway speed and will not restart... 20 miles from any help... GRRROWLLL @#$%!!! :-((((
My mechanic is now grasping at straws, suggesting bad motor mounts are the cause... Baloney!!! How can we troubleshoot and fix this problem without throwing any more parts at the same thing??? Is there a broken wire somewhere or a bad ground??? Maybe a resistor or capacitor in the circuit that we missed??? Or perhaps a new ECM is needed???
I replaced the ECM last year with a used unit because of rought idling and stalling problems... Could it have gone bad once again? Is there any way to tell without wasting money on part swapping?
The problem is persistently-intermittent, so how can we diagnose this failure mechanism once and for all time??? I cannot afford any more tows from out in the desert to the shop in town...
Is there anyplace to get a decent schematic for this problem? and where can we find the part number(s) for the ignition harness that goes between the ECM and the coil??? ARE there any ECM diagnostics to test for a coil driver failure?