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2006 Jeep Cherokee 4.7. When in open loop engine runs fine, Cylinders1, 3, 5, 7, go dead in close loop.

Tiny
CURTIS78
  • MEMBER
  • 2006 JEEP GRAND CHEROKEE
  • 85,000 MILES
Cylinders 1, 3, 5, 7, go dead when engine goes into close loop. Replaced o2 sensor bank 1 sensor 1. When engine is warm you can unplug overhead coils for 1, 3, 5, 7 and no change.
Monday, April 16th, 2012 AT 11:37 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would be looking at a possible pcm. Before doing this, get a real shop with the ability to diag this correctly.

Make sure they do a compression test and check all the basics.

Roy
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Monday, April 16th, 2012 AT 11:55 PM

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