Code 1391 runs great with CMPS unplugged Jeep Registry
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Code 1391 runs great with CMPS unplugged

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redheadmike73
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Jeep Information


I am working on a 2000 GC limited 4.7. It has code 1391. I have replaced both the CKS and CMPS with factory sensors. Both show good 5v and have good grounds. I cannot find any issues with the wiring at all. I noticed when I fire it up (starts great) it has a very random miss for just a second. Nothing steady, just randomly. I saw a guy here that unplugged the van sensor after start up and it was smooth. I did the same and mine runs like a clock after the unplug as well. He put in a time delay relay to fix it. Then no more update. I am thinking of doing the same but was wondering if anyone has had the same experience and knows the fix. Fuel is rock solid at 50psi always. Always starts right up. New sensors. Other wise a gem of a rig! Any help would be awesome! Thank you

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