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Old 06-23-2014, 09:09 AM
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GeP
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Jeep Won't start

Hi Guys,

I have a 2001 TJ 4.0 I6 MT. During some regular service, the jeep was washed (underbody wash etc), and now it will not start. It cranks, but just will not turn over.

I am seriously at a loss. I have tried checking all the electrical niggles that might cause this, but nothing yet. I have got a auto electrician to check all the connections and cables for a fault, but that has not helped.

Could it be the PCM? This is a second hand jeep, and I am not sure what has been done to the PCM previously, but could something have triggered the PCM to crash/stop working?

Understandably, I would rather find a solution to fixing the current PCM than buy a new unit, so I would appreciate any help that any of you could provide.

Thanks in advance.

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Old 06-23-2014, 09:34 AM   #2
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Do your gauges respond when you turn the key to the RUN position?

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Old 06-23-2014, 10:53 AM   #3
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I have a similar problem with my 2000 TJ 4.0 MT. It started right after it was washed at a drive thru wash. Sputtered and stalled. Finally got her to run, but was missing badly. Analyzer said coil not firing. Replaced coil pack. Now it's not running at all with either the new coil pack or the old one. Cranks fine, just no fire. Any hints would sure be appreciated. About to pull the little bit of hair I have left out.!!
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Old 06-23-2014, 02:36 PM
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Quote:
Originally Posted by tangofox007 View Post
Do your gauges respond when you turn the key to the RUN position?
Yes. All gauges except the fuel gauge seem to be working. I initially thought that I ran out of gas, but even after filling her up the fuel gauge stays on Empty.
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Old 06-23-2014, 10:56 PM   #5
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Check the ground on the right side of your transmission. That is the ground for your fuel level sensor and many other sensors. Under washing the Jeep may have loosened it. Make sure it is tight and clean.
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Old 06-23-2014, 11:00 PM   #6
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Check the ground on the right side of your transmission. That is the ground for your fuel level sensor and many other sensors. Under washing the Jeep may have loosened it. Make sure it is tight and clean.
washing can loosen a ground? Wow! How is it connected to the tranny? Is it bolted on or is it a connector? Are there other wires that can loosen like that? I wash under my jeep every time I wheel.
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Old 06-23-2014, 11:16 PM   #7
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Any vibrations can loosen up connections. Add water and oxygen and you get corrosion. Corrosion equals resistance. With sensors that use 5v reference 1 ohm of resistance can make a world of difference. All grounds are connected to multiple points on the chassis, engine and transmission

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