Results 1 to 9 of 9

Thread: New to Me 2003 Cummins Running HOT

  1. #1
    Tuner in Training
    Join Date
    Mar 2019
    Location
    South West Montana
    Posts
    22

    New to Me 2003 Cummins Running HOT

    So I just picked up a 2003 ram 3500 with the 5.9 Cummins and 6-speed manual.
    The owner who did all the performance parts was not the owner I bought it from, which makes things tough.

    She runs hot! cruising at 60mph on a flat road it was running 800°F, IN THE DOWNPIPE!
    First things first, I am working on getting the EGT probe into the manifold, where it belongs.

    I found a boost leak, and fixed it; no real change. So then I loaded in a stock tune file. Now its running 600-700°F at 60mph. It also black smokes constantly, except at idle, but any throttle position it smokes. Even cruising at 60 you can see a light black haze out the pipe.

    Known mods:
    It had a smarty jr (I put in a stock tune file)
    s300sx3 Turbo (p/n: 177283)
    3-piece manifold (either has wrong charge pipe, or wrong boots; bad angles which caused the original leak)
    Mishimoto 3.5" in/out intercooler
    Some type of high flow intake elbow
    4" straight piped
    FASS Lift Pump

    The head appears to have been removed at some point, so I have no clue if anything has been done to it.

    Really just looking for a way to keep things cool and safe. Plus I need to haul a 10k trailer through the mountains soon.
    I am experienced with GM gas tuning on HP Tuners, but never tuned a diesel. I have built a 12 valve in the past and understand the core concepts.
    This is my DD until my GMC gets it's transfer case rebuilt, until the GMC is back together I just need this truck to last. Once I have my other truck back Ill start tearing into the ram lol

    TIA
    Last edited by briscobones; 6 Days Ago at 06:04 PM.
    2007.5 GMC Sierra 4x4 - L76 6.0L, Comp Cam VVT, DOD delete, LSXRT Intake, lS7 TB, KN CAI-
    1 3/4 LT Headers, 3 inch custom dual/x-pipe, 7" Lift, 35's, 4L70E (stock), old set-up made 345rwhp

    2002 Camaro Z28 6spd - 5.7L, SLP Lid, TSP 2.5 true dual and 1 7/8 LT Headers
    Hopefully a big bad crate engine soon.

  2. #2
    Tuner in Training
    Join Date
    Mar 2019
    Location
    South West Montana
    Posts
    22
    This morning was the first cold start on the stock tune, noticed a decent amount of white smoke.
    That injector timing, isnt it?
    2007.5 GMC Sierra 4x4 - L76 6.0L, Comp Cam VVT, DOD delete, LSXRT Intake, lS7 TB, KN CAI-
    1 3/4 LT Headers, 3 inch custom dual/x-pipe, 7" Lift, 35's, 4L70E (stock), old set-up made 345rwhp

    2002 Camaro Z28 6spd - 5.7L, SLP Lid, TSP 2.5 true dual and 1 7/8 LT Headers
    Hopefully a big bad crate engine soon.

  3. #3
    Senior Tuner Jim P's Avatar
    Join Date
    Jan 2018
    Location
    Everywhere
    Posts
    1,681
    Could be a lot of things but does sound like you got some large injectors installed on the truck

  4. #4
    Tuner in Training
    Join Date
    Mar 2019
    Location
    South West Montana
    Posts
    22
    Quote Originally Posted by Jim P View Post
    Could be a lot of things but does sound like you got some large injectors installed on the truck
    Thats definitely what I was thinking, and IIRC, only way to tell what size is to pull them.
    2007.5 GMC Sierra 4x4 - L76 6.0L, Comp Cam VVT, DOD delete, LSXRT Intake, lS7 TB, KN CAI-
    1 3/4 LT Headers, 3 inch custom dual/x-pipe, 7" Lift, 35's, 4L70E (stock), old set-up made 345rwhp

    2002 Camaro Z28 6spd - 5.7L, SLP Lid, TSP 2.5 true dual and 1 7/8 LT Headers
    Hopefully a big bad crate engine soon.

  5. #5
    Senior Tuner Jim P's Avatar
    Join Date
    Jan 2018
    Location
    Everywhere
    Posts
    1,681
    Just pulling them won?t tell you anything, you have to sent them in to a shop to get them flow tested, which would at the same time test for potentially bad injectors.

  6. #6
    Tuner in Training
    Join Date
    Mar 2019
    Location
    South West Montana
    Posts
    22
    Quote Originally Posted by Jim P View Post
    Just pulling them won?t tell you anything, you have to sent them in to a shop to get them flow tested, which would at the same time test for potentially bad injectors.
    Well crap, lol.

    There any way to turn them down in the tune without knowing their size?

    Edit: Like, until I can get them flow tested; should I reduce PW by 10-20%, maybe add some timing? Fiddle with it until it runs clean and cool?
    Once I get my DD back I'll take in the Cummins to get the injectors flow tested. But until then, it is my only vehicle.
    Last edited by briscobones; 5 Days Ago at 12:01 PM.
    2007.5 GMC Sierra 4x4 - L76 6.0L, Comp Cam VVT, DOD delete, LSXRT Intake, lS7 TB, KN CAI-
    1 3/4 LT Headers, 3 inch custom dual/x-pipe, 7" Lift, 35's, 4L70E (stock), old set-up made 345rwhp

    2002 Camaro Z28 6spd - 5.7L, SLP Lid, TSP 2.5 true dual and 1 7/8 LT Headers
    Hopefully a big bad crate engine soon.

  7. #7
    Senior Tuner Jim P's Avatar
    Join Date
    Jan 2018
    Location
    Everywhere
    Posts
    1,681
    Reducing pulsewidth across the entire table by x amount of percent isn?t how it works. If you look at how companies rate injectors, it?s x amount of percent above stock at x psi of fuel pressure. It?s not linear across the table. White smoke can be a large amount of possible things, injector or injectors sticking open, very large injectors uncompensated for, bad head gasket, bad tuning. You could just have very large injectors in the truck but who knows. If you got something like a bad head gasket or injector or injectors sticking or leaking, no amount of tuning will compensate for that.

  8. #8
    Tuner in Training
    Join Date
    Mar 2019
    Location
    South West Montana
    Posts
    22
    Quote Originally Posted by Jim P View Post
    Reducing pulsewidth across the entire table by x amount of percent isn?t how it works. If you look at how companies rate injectors, it?s x amount of percent above stock at x psi of fuel pressure. It?s not linear across the table. White smoke can be a large amount of possible things, injector or injectors sticking open, very large injectors uncompensated for, bad head gasket, bad tuning. You could just have very large injectors in the truck but who knows. If you got something like a bad head gasket or injector or injectors sticking or leaking, no amount of tuning will compensate for that.
    I wasnt talking about tuning for injectors, I was talking about testing for big injectors. If pulling out pulse width (and/or pulling out full) clears up white smoke and drops EGTs, that would be an indicator of big injectors. If all that did was lose power and it still white smokes and runs hot, then its probably something else.
    Im watching my coolant levels to see if it's consuming coolant, I want to mess with the tune to see if it's bad tuning/big injectors, gonna leak test exhaust and charge side again today.
    Im trying to do all the easy stuff first, before tearing into the engine or pulling injectors.
    2007.5 GMC Sierra 4x4 - L76 6.0L, Comp Cam VVT, DOD delete, LSXRT Intake, lS7 TB, KN CAI-
    1 3/4 LT Headers, 3 inch custom dual/x-pipe, 7" Lift, 35's, 4L70E (stock), old set-up made 345rwhp

    2002 Camaro Z28 6spd - 5.7L, SLP Lid, TSP 2.5 true dual and 1 7/8 LT Headers
    Hopefully a big bad crate engine soon.

  9. #9
    Senior Tuner Jim P's Avatar
    Join Date
    Jan 2018
    Location
    Everywhere
    Posts
    1,681
    Whatever floats your boat. This is the point where I bow out.