Discussion in 'GM Diesel & DuraMax' started by lowriderinms, Jul 29, 2009.

  1. lowriderinms

    lowriderinms Rockstar

    hey guys so far yall have been pretty helpful, so i hjave some more with my new toy.. when i am above 45 or so and i accelerate, i have the check engine light come on... i used a key to jump the circuits and it gives me a 29 code... i looked it up and all it says is glow plug relay circuit.. any info on that would be great. also what size gears would make my truck run 3200 rpm at 75 rrpm? just curious. i am gonna use it to haul my other truck when it is done so i am wondering
  2. 2COR517

    2COR517 Epic Member 5+ Years 1000 Posts

    What year/model/mileage/etc.? Sounds like it's a diesel.
  3. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    I have see diesel trucks do this before. Once the engine heats up the glow plugs should turn off. A relay usually fixes this problem.
  4. grimreapersshadow

    grimreapersshadow Rockstar 100 Posts

    as for the gears it would proalby would be larger then 456's proalby something like 488's neightborhood
  5. 2COR517

    2COR517 Epic Member 5+ Years 1000 Posts

    4.88 sounds a little short for a diesel. Unless he's running 44s

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