1999 Other Jeep Models Cause of P020 misfire codes

Tiny
MIKE PRESTLY
  • MEMBER
  • 1999 JEEP
  • V8
  • AWD
  • AUTOMATIC
  • 100,500 MILES
Our '99 Grand Cherokee LTD with the 4.7 L V-8 has had an issue with only occasional eratic idle, and a fuel cleansing from the local Jeep dealer helped alot for awhile. While towing an enclosed trailer long distance, the check engine light appeared and stayed on for the next week. The speedometer seems to have occasional rapid fluctuations of approximately 2-4 mph. The Jeep also has the tach 'bouncing' while traveling at a constant speed down the road. It acts almost as if the lock-up torque converter is unlocking and then relocking repeatedly. While the diagnostic computer was attached to the vehicle it detected the misfire codes P0201 and multiiple other cylinders are involved. Also cylinder #1 was only firing maybe one out of every 6-8 cycles. The local independent shop that read the codes mentioned that the only other vehicle they have seem with this same problem of misfires was a Durango with the same 4.7 L and it needed an entirely new ECM to solve the problem. They are not sure that ours will need the same. With the expense of a new ECM, we are hoping to get a more specific answer. Do you have any ideas or information?
Do you
have the same problem?
Yes
No
Thursday, January 10th, 2008 AT 7:20 PM

3 Replies

Tiny
FISHERMAN
  • MEMBER
Hello Mike!

My advice its to switch the injectors from #1 to #6 and see if the #6 its misfiring.
Also check the resistance on all of them.
The problem can be as easy as a faulty injector/s!
(could be that couple of them are faulty)

P0201 Injector Circuit Malfunction - Cylinder 1, does not respond properly to control signal

Specific P0201 its just cyl. Number one!

Let us know on your findings!
Was this
answer
helpful?
Yes
No
Thursday, January 10th, 2008 AT 7:45 PM
Tiny
MIKE PRESTLY
  • MEMBER
We had the fuel rails and injectors cleansed and blown out physically and with a high pressure cleaning system. All misfires have so far been solved, only time will tell if it continues to work.
Was this
answer
helpful?
Yes
No
Thursday, January 17th, 2008 AT 8:33 PM
Tiny
FISHERMAN
  • MEMBER
Only Time. (Enya)

Sound good Mike!

Good Luck!
Was this
answer
helpful?
Yes
No
Thursday, January 17th, 2008 AT 8:55 PM

Please login or register to post a reply.

Recommended Guides