2004 Jeep Cherokee 2004 Grand Cherokee Stalling No Codes

Tiny
PCRAIN60544
  • MEMBER
  • 2004 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 125,000 MILES
My 2004 Jeep Grand Cherokee 6 cyl has a weird problem my techs can't diagnose. While driving on a daily basis the tachometer and speedometer will dip down occasionally when I hit a pothole or bumpy road. No other gauges are effected. After a while the engine will stall when this happens, usually causing loss of power to the engine, and eventual shutoff of the engine. The check engine light never lights up, and when scanned for codes none exist and none are pending. As a matter of fact when this condition occurs the entire computer is reset to 0 engine starts since last scan. The tests are also showing not ready and no drive cycles completed. The wiring harnesses and connectors visually look OK as far as we can tell, and when testing the 5V and grounds at the terminals while parked things look good at inspection. We suspect somewhere somehow some component is shorting out the 5V but no idea where to start. Or we could be completely off and need your expertise.
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Friday, October 9th, 2009 AT 12:44 AM

4 Replies

Tiny
SERVICE WRITER
  • EXPERT
Look for the engine harness damage at the left rear head stud I have seen several rubbed thru and cause this condition. It is usually poked thru the harness tubing.

Also, check the ground on right side of the block. Remove, clean and reinstall.
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Friday, October 9th, 2009 AT 7:45 AM
Tiny
PCRAIN60544
  • MEMBER
Thank you, will have those items inspected today and report back with the findings.
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Friday, October 9th, 2009 AT 10:11 AM
Tiny
PCRAIN60544
  • MEMBER
Harness did show signs of wear through tubing, but no sign of wire insulation failing. Did rewrap and protect just in case.

Also replaced the crank sensor as proactive step since they fail so often and it was only 30 dollars.

Really won't know until road tested for a few days

But thanks for the good advice
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Friday, October 9th, 2009 AT 8:27 PM
Tiny
ASTEDMAN
  • MEMBER
Grand cherokee stalls or dies out. With no codes
1998 and earlier.
1) Check your connections at the ECU (ENGINE CONTROL UNIT) may be called
the PCU (POWERTRAIN CONTROL UNIT) on the passenger side firewall.
On 1998 and earlier the 3 plugs sometimes get a bad or loose connection.
It is ususally the one closest to the fender, unplug and spray the connections with a cleaner
and replug. You may even have to wrap a zip tie around the back of the ECU and zip it to
keep the plug in tight. Take it for a test drive.
2) This may also be the problem. It is going to sound screwy, but there are torx screws
on the 1998 and earlier ECU. Back them out about a 1/3 of a turn. The screws are too long
and are causing some kind of short in the connection. Take it for a test drive.

3) FOR 1999 AND LATER (this was my problem)
I had same problem. 87,000 2000 grand cherokee 4.7l
when I let off the gas it might stall. Happens 1 to 4 times a day.
THERE WERE NO ENGINE CODES
I tried all the above but no luck.
So far I have (not sure if I remember the prices right)
- replaced the crank shaft sensor - it stopped stalling for 3 days $45
- cleaned the throttle boddy free
- replaced the throttle position sensor $72
- replaced the idle air control sensor $132
- replaced the map manafold airflow sensor $125
no luck it is still stalling..
By the way I did all the work myself. It was about 30 minutes for most parts.
I finally ordered a rebuilt ecu or pcu engine control unit. They program in the vin, mileage,
and part nbr so your grand cherokee will recognize it. $185 (rebuilt - off ebay)
IT CAME AND THAT SEEMS TO HAVE FIXED THE PROBLEM.
IT HAS BEEN A WEEK. SO FAR SO GOOD
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Tuesday, November 17th, 2009 AT 3:03 PM

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