Won't start contribution test???

WackerCattle · #1 (**permalink**) 08-16-2012, 10:22 AM

2001 F250 7.3 auto stock.
Okay, I have replaced my cam and exhaust backpressure sensors, and fixed my under valve cover harnesses. This got the check engine light off, but I still have a miss-no codes. Went to the cool guy in town with the proper SnapOn code reader to do a buzz test and contribution test, and my truck would NOT initiate the contribution test. Does this happen much? We looked at the pre-delivery values of the injectors while running, and 5 and 8 had higher numbers. This makes me think those would be my bad injectors, but why wouldn't it start the contrib? I am thinking clogged nozzles since I found really fine sand in my filter.Can these be "cleaned" in some way?
BTW it does not smoke.

WackerCattle · #2 (**permalink**) 08-23-2012, 07:10 PM

Also wondering if it could be IDM?? Would that throw a code?

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