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Old 01-04-2012, 08:55 PM
ChevyTruckGuy ChevyTruckGuy is offline
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Originally Posted by 40 grey
Thanks to all for their help and suggestions. After further testing and retesting, the EGR valve was found to be intermitantly sticking open when solenoid commanded it open(cruise over 40mph). Oddly enough it would manually test okay, held vacuum, and pintle moved freely off the truck. When on the truck it would sometimes not seat or open freely after it was hot. New one(ac-delco) is coming tomorrow. Hopefully this is the problem. ---

---BTW, it ran pretty good with automatic ecm and prom. Low idle(500rpm), and shift light on steady were only observed problems.-----
That is what I was thinking was wrong! But with out the 3 shop manuals I don't know how you new everything was working correctly? Not unless you have the 3 shop manuals? Also here is a good site for trucks and mods

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