erratic idle - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 07-17-2009, 09:58 AM Thread Starter
Carney's Avatar
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erratic idle

My 7.3 rpm jumps from 500 to 800 while idling. I changed the fuel filter, took my superchips tune off and still doing it. I don't notice it while driving but it starts jumping after I start it or drive it for a few hours.

I have heard something about a wiring harness under the valve covers?

What would be the best code reader to buy and diagnose with?


2002 F250 SD, CC, SB, auto, AFE stage 2, Wicked Wheel, DP Tuner

1999 Jeep TJ, 5.13's, HP 60, 14Bolt(both lincoln locked), 40" Creepy stickies, 110" WB
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post #2 of 2 Old 07-17-2009, 10:07 AM Sponsor

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Take the oil cap off and smell for any sort of a burning smell. It will smell horrific and not much like oil. IF you have that bad smell that will lead you to the wiring harness under the valve cover to be burnt. Its semi common on these trucks and will cause what your talking about!!

1996 f350- 615hp/1258tq uncorrected

2008 KR f350- leveled and tuned 569hp/1158tq

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