2006 JEEP CHEROKEE 4.7 . WHEN IN OPEN LOOP ENGINE RUNS FINE ,CYLINDERS1,3,5,7, GO DEAD IN CLOSE LOOP.

  • Tiny
  • curtis78
  • 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.

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Monday, April 16th, 2012 AT 11:37 PM

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  • Tiny
  • ASEMaster6371
  • Expert
  • 25,556 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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