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Thread: 04 Cummins 6 speed

  1. #1
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    04 Cummins 6 speed

    has anyone ever seen a early 04 6 speed truck not come back down to normal idle? this isnt a issue caused by hp. but trying to fix it.
    sometimes when coming to a stop, clutch depressed, the truck will idle at 1100 rpm. only way to get it to 750 is to partially let the clutch out in gear then back to the floor. dont see anything in logs, other then for a manual its showing trans temp at 236*.??
    I attached a log while the truck is doing it own idle up. towards the end it comes down, only thing i did was push the clutch in a few times. this was all sitting in the driveway.
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    Tuner MAIDENCR's Avatar
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    you can send your channel list please
    03 cummins,100hp nozzle,dual cp3,s468/87 or sxe472

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  4. #4
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    Why is your rail pressure so low??? You got some super weird sh*t going on... Post your tune so we can see what it is your did.

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    Looks like you are running in misfire mode as well. Might be looking at that wrong though.
    Last edited by Jim P; 06-27-2019 at 05:13 PM.

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    Quote Originally Posted by mstoaks View Post
    has anyone ever seen a early 04 6 speed truck not come back down to normal idle? this isnt a issue caused by hp. but trying to fix it.
    sometimes when coming to a stop, clutch depressed, the truck will idle at 1100 rpm. only way to get it to 750 is to partially let the clutch out in gear then back to the floor. dont see anything in logs, other then for a manual its showing trans temp at 236*.??
    I attached a log while the truck is doing it own idle up. towards the end it comes down, only thing i did was push the clutch in a few times. this was all sitting in the driveway.
    ecm doesnt monitor trans temp on the manual transmission.

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    nope its running in misfire correction

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    White smoke at all out the exhaust? And post up your tune so I can see what you did to be sure it's not tuning related. If you don't want to publicly post it , pm it to me.

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    Quote Originally Posted by Jim P View Post
    ecm doesnt monitor trans temp on the manual transmission.
    i fully understand that, but trans temp is showing while logging.
    this truck has done some weird things. which im still working the bugs out.
    this idling issue started with a edge evolution tuner. and has carried over to hp.
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    Quote Originally Posted by Jim P View Post
    White smoke at all out the exhaust? And post up your tune so I can see what you did to be sure it's not tuning related. If you don't want to publicly post it , pm it to me.
    no smoke, get a small puff of smoke at wot. no hazing at idle either.

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    Quote Originally Posted by mstoaks View Post
    no smoke, get a small puff of smoke at wot. no hazing at idle either.
    Not ?making oil?? Asking these to try to rule out possibility of leaking injector. Is your wait to start light stuck on?

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    I?ll take a look at your tune in a short bit

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    Quote Originally Posted by Jim P View Post
    Not ?making oil?? Asking these to try to rule out possibility of leaking injector. Is your wait to start light stuck on?
    no wait to start, havent checked oil level.

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    I'm leaning towards hardware fueling issue. Disable the leak detection in the Fuel Sys tab, Fuel Pressure tab, far right very bottom, reflash and see what happens. Then try turning off misfire timing with leak detection off , flash and see what happens. Your issue can be coming from imbalanced injectors, FCA issue, weak rail PRV, weak cascade overflow valve, too high of injector return rate. You have something causing very low rail pressure, below desired from commanded tables. Might be different on the 03-04 but 05-07 max desired rail pressure during a leak detect is 35MPa and you are 10MPa below that. There could be a combination of things happening here in the fuel system causing your issues.

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    Usually the leak detection will lock on the wait to start light and the ebrake light I believe it is. A large enough imbalance between the injectors could cause misfire to happen and activate misfire timing

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    i will give it a shot and report back. appreciate it!

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    Any luck here?

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    Its a early 04? 305hp or a 04.5 325hp?

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    Early 04, irrelevant though, there?s a hardware issue going on

  20. #20
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    You dit some change in corrections table of rail pressure??