odd dmax misfire

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Uploaded by on Jul 13, 2011

only happens when warmed up, nothing abnormal in log...just starts missing around ~3000rpm. Reflashed back to stock tune, still no change, reflashed with a tune that has the rev-limiter disabled, still no change etc.. Only thing I can think of is the ECM is dropping CKP signal at higher revs for some reason.

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Uploader Comments (penguin1494)

  • nope...CKP sensor was loose, and the other problem was that I have a medium duty (ie, kodiak) front cover on this engine....the CKP sensors for the pickups and the kodiaks are clocked differently, so the sensor was misaligned. I had to oval out the hole in the mounting tab, and use a washer so I could re-clock and tighten the CKP sensor. Basically....a problem that no one has ever seen before (and probably a problem that no one will ever see again)

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  • Bad fuel? Sounds like water.

  • Ben, if this is on your 05 LLy then most likely the reluctor wheel for the crank sensor is walking loose causing a loose of signal. Pull the crank sensor out and try to move the reluctor with you finger.

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