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Thread: 04 Cummins 6 speed

  1. #21
    Advanced Tuner
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    It?s not in the tuning

  2. #22
    Tuner MAIDENCR's Avatar
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    The other time i bapassed all correction in my tune and pressure was 3500psi at idle..

  3. #23
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    that is stock in his tune

  4. #24
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    he could possibly be having grounding/voltage/ecm issues as well, look at what sensors are doing in the log

  5. #25
    Tuner MAIDENCR's Avatar
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    Probably...i know that with stock tune if you disconnect fan clutch sometime rpm hang up....probably its shorted inside or wire have been cut and they short together

  6. #26
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    Won?t cause the extremely low rail pressure and misfire timing though and don?t believe it would cause the map sensor and throttle sensor to show sky rocketed readings

  7. #27
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    A scan for DTCs should be done, grounding and battery connections checked over, I?d have the high pressure side of the fuel system checked out

  8. #28
    Tuner in Training
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    Here is my experience with this, take it for what its worth: My early 04 would randomly high idle at 900 - 1100 RPM in any weather condition. Letting the clutch grab a bit was the only way to pull it down. I had no white smoke, and no fuel in the oil until one day when it started missing and smoking white after a few hard pulls. I installed a new set of injectors; the problem has not come back once and its been over a year. Good luck!
    2004 GMC Sierra ECSB - 5.3L - TSP 220/220 - Ported 862s - Pacesetter LTs w/ ORY - TB converter | 1998 S10 SCSB - 305ci - 218/218 - Ported 416s - Blow-through Holley - Single T62-1 - 3k converter | 2004 Dodge Ram 3500 CCLB DRW - 5.9L - 6MT - Intake / Exhaust

  9. #29
    Potential Tuner
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    Feb 2017
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    Hey guys sorry for the delay, i havent had a chance to get back to the truck, i do know the rail pressure issue is fixed, that was on me. however the high idle issue is still present. i need to get more logs but the truck is 1.5 hrs away from me.

  10. #30
    Tuner in Training
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    How many miles on the truck? Read somewhere that when injectors start to fail a symptom is the rpms hang. They recomand a snap nest in neutral. Blip the throttle and if the rpms hang before come to an idle it's a sign of the end

  11. #31
    Potential Tuner
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    I have the same issue, Called a hanging idle or slow deceleration. 03 Cummins NV5600, bumping the throttle up it'll hang from 1200 to 800 for a few moments before coming back down. Mine isn't as bad as others which take minutes to come down sometimes, but its most-likely going to be an injector related issue of wear and tear, my truck has 209K on it but previous owners didn't have a 2 micron fuel filter system on it, they had a 7. I just got to putting a Fass system with CAT filters on last weekend.

    Link to some fuel diagnosis info : https://cdn.oregonfuelinjection.com/...diagnostic.pdf
    I'm getting old.