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02 Jeep Liberty running on two cylinders. Any thoughts?

Tiny
CBOSWELL
  • MEMBER
  • 2002 JEEP LIBERTY
  • 120,000 MILES
Short term fuel trim 99.2 on both banks. I've put in new plugs new iat 1 new 02 sensor. Monday it was idling on two cylinders as I had four coils unplugged. Fuel pressure is 55. All 4 02 sensors are active, the fuel trim being maxed out is driving me crazy
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Wednesday, October 26th, 2011 AT 1:00 PM

4 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
The short term trim doesn't really tell you much. What is the long term? Have you looked at the other sensor data for someting out of parameter?
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Wednesday, October 26th, 2011 AT 1:31 PM
Tiny
CBOSWELL
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  • 9 POSTS
Long term fuel trim is 0. All four 02 sensors are jumping any where from 8.40 to 9.80 Map Los at idle is around 80 kpa
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Wednesday, October 26th, 2011 AT 1:54 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
I think you have your decimal point in the wrong place on those readings but it still wouldn't make any sense to have everything indicating rich except the long term trim.
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Wednesday, October 26th, 2011 AT 1:57 PM
Tiny
CBOSWELL
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  • 9 POSTS
The thing that's still blowing me away is that it's running on two cylinders. Never thought that was possible. And the fact that idles is at 500 rpm's is weird when I was trying to see which cylinders weren't firing
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Wednesday, October 26th, 2011 AT 2:12 PM

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