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Power Strokes
6.0 Tech
sudden RPM increase rough iddle
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[QUOTE="Long Gone, post: 1528564, member: 31343"] Just got everything back together after HPOP went out due to disintegrated sump screen under oil cooler in an 04 built 8-22-03. Replaced HPOP with Thoroughbreds/dieselsite adrenaline pump/ oil cooler and sump screen (this time SS upgrade of course). Things were looking good, went about 80 mi into town and back no problems other than an exhaust leak that I found was do to me leaving out a spring on turbo to exhaust pipe(?). Replaced spring (with one off the old turbo tube boots left over from upgrade to sinister boots just installed) and had it idling fine for about 5 - 10 minutes while I checked for leaks. Noticed a funny hiss like an air leak that would come and go. I was trying to trace this down when the engine suddenly jumps up in RPMs to just over 1k and runs real rough. It sounds like the throttle is being stepped on an let off constantly with very fast climb and deceleration and a lot of injector rattle. Scan gauge shows high IPR at <> 2600 and icp <> 27 %. I have looked for wire chaff and unplugged the turbo to no effect. The truck will run fine as long as i am over 1k but sounds rough on things when attempting to idle. Needless to say I haven't run it much more than to diagnose. I have checked the seating of the FICM connectors and it seems that all three plugs are seated fine along with the PCMs connectors. Looked online for similar problems but haven't run into anything like it. Surer would appreciate it if someone could point me in the right direction as It just sounds like it is hard on the new injectors (1-2k on them same time as the new OEP head gaskets and New Age SS ARP head studs). The IPR I am sure is suddenly high but why? Is this cause or an effect? [/QUOTE]
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sudden RPM increase rough iddle
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