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Old 07-25-2010, 09:31 PM   #1
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Unhappy Am sooo frustrated any ideas!!!

I have a 2005 jeep wrangler 4.0 6 cylinder right hand drive for my job! Has been a great vehicle til now ... had it in the shop to be repaired because i will be driving along and the engine stalled and wouldn't crank and no guages. The shop replaced the ignition coil and gave it back to me with a hefty bill! Worked good for two weeks and the coil went out again! Shop replaced it (at no cost to me) saying it was a defective part! The very next day the new coil went out! Does anyone have any ideas what could be causing the coils to burn up that quick? The mechanics don't have a clue what the cause is!
I want my jeep back for work sooner then later!!! Thanks for any help you can give me!

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Old 07-28-2010, 05:57 PM   #2
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only 2 things that i could think of, PCM keeping the driver active on that coil or possibly ground issue, but i wouldnt think that ground would limit it to 1 coil. hope this helps.

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Old 07-29-2010, 04:53 AM   #3
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Something is definitely keeping that coil hot. I'd start looking at the cam or crank position sensor.

Taken from the OE service manual;
Quote:
The 3 coils dual-fire the spark plugs on cylinders
1-6, 2-5 and/or 3-4. When one cylinder is being fired
(on compression stroke), the spark to the opposite
cylinder is being wasted (on exhaust stroke).
Battery voltage is supplied to the three ignition
coils from the ASD relay. The Powertrain Control
Module (PCM) opens and closes the ignition coil
ground circuit for ignition coil operation.
NOTE - The coil is a 1 piece unit consisting of 3 different coils

Power is controlled by the PCM. Trace the wire harness from the coil back to the PCM and look for rub through or pinches that may have shorted one of the PCM ground signal lines to ground.

The shop that installed your coil should be able to hook up to the OBDII port and watch the cam/crank signal to make sure it is OK. They should also be able to check to see if one of the signal lines is staying grounded depending on engine position by Ohming out the signal lines.
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Old 07-29-2010, 05:04 AM   #4
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seems since is the third coil and it's on their dime that they would know enough to check why the coils, if it is the coils, are being fried.
Sounds like a loose ground somewhere. does it die just out of the blue or are you doing something, like hitting a bump in the road or whatever.

I had a Ranger that would just die after going over some railroad tracks or a small bump. Power shut down, steering lock up, just would go dead. very dangerous.

It would just spin when I engaged the key. Of course there were a hundred wires all over the places, but I lucked out and jiggled the correct one. It looked like an inline fuse holder but it was nothing more than a contact.
I bypassed that by rewiring and I've never had the problem since.
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Old 07-29-2010, 05:08 AM   #5
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The wires for the ground signal to the coil are

BK/GY - coil 1 pin 1
DB/TN - coil 2 pin 3
RD/YL - coil 3 pin 4
Pin #2 is a DG/LG wire and is constant power from the ASD relay/coil capacitor.

Testing should work by disconnecting the coil pack harness, key on - engine off, using a Ohm meter, one lead to ground, the other to each of the signal lines in the harness connector one at a time. Rotate the engine by hand. You should see the Ohm meter show OL or no continuity then hopefully close to 0.0 Ohms as you rotate the engine around as the PCM senses the cam and crank sensors showing what cylinders are at the firing point.

DO NOT TOUCH PIN 2!!! You will not like the result.
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Old 07-30-2010, 07:00 AM   #6
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thanks for the adive ... shop finally found the problem! Had bare wires on the harness on the back side of engine! hopefully problem fixed!!
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Old 07-31-2010, 05:24 AM   #7
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Glad they were able to find the problem and get you up and running.

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