02 7.3 check engine light

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Sep 19, 2009 | 05:33 AM

asphaltcowboy1074

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02 7.3 check engine light

My light comes on when I am driving highway speeds. It never stays on long, 5 min or so and as soon as you turn the ignition off, it clears the code so I cant get a read on it. It happens when downshifting and accelerating to pass or pull a hill. Any ideas? I do have a superchips tuner installed but I have tried both with and without programming installed with the same results. Other than the light coming on, the truckruns fine. I have about 125k on it and this has also happened through 2 cam sensors.

Sep 19, 2009 | 06:09 AM

greedy737

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From: Lenhartsville PA

Maybe an over boost thing, but if the light came on it stored a code. How did you read the codes?

Last edited by greedy737; Sep 19, 2009 at 06:11 AM. Reason: sorry I didn't see you said downshifting to!

Sep 19, 2009 | 09:50 AM

SuperDoodie

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From: Liberty Lake, WA

I suspect if you were to pull the codes with a scanner, its gonna be either P1211 or an overboost code.

Sep 19, 2009 | 12:03 PM

asphaltcowboy1074

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Is that anything to worry about or is there something I can do to fix it?

Sep 19, 2009 | 07:59 PM

zx250

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From: Concord NC

Depends on the code.

Sep 19, 2009 | 08:43 PM

F350-6

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From: Texas

I thought the Superchips tuner could pull codes? Just because the light goes out doesn't mean the codes dissapear. The PCM will remember the codes for a while, even after the light goes out.

Another P1211 guess here.