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
Tuesday, November 17th, 2009 AT 3:03 PM