99 7.3 idle problems
hey everyone this is my fist post on powerstroke, and im having some problems with my 99 7.3 the problem im having is a rough idle and my truck does this power surge while driving. when im cruzing at low rmps and have the throttle about 1/4, it will start jerking and speeding up and down as if im feathering the pedal. as far as the idle goes, it allways does it no matter the temp or how long its been drivin.
ive have had a loacal deisel mecanic run some tests on it and hes come up with nothing. so far ive had him change the wireing harnesses that are under the valve covers for the injectors, he took out all the injectors and replaced all the o rings. ive had ford change out the cps under the recall 2 months ago. he did the contribution test like 20 differnet times and so far no injector is showing its faulty. there are no codes stored in the computer and no engine light ever comes on.
my truck has around 130k on it, its got a 4" stright pipe smoke stacks with and aftermarket donwpipe. k&n filter, banks intercooler, banks biger tourbo housing and wastegate controler, and a banks chip. ive also put the high oil preashure cross over line and the fuel regulator bypass kit from diselinnnovations. i have snowperformance water meth injection that i use for towing. the truck runs real good once you get past that certain rmp, gots plenty of power, and runs real smoth in higher rpms. i tow a 10K pound weekend warrior with no problem. its just that idle thats been realy irriatating me. i tried a search on this subject but didnt find anyone having that same probmlem, so if anyone has any sugg on what to try or change, i would shure appricate it.
Last edited by diebog; 07-28-2009 at 08:17 PM.