Mechanics

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

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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Curtis78
April 16, 2012.



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

ASEMaster6371
Apr 16, 2012.