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Thread: cold acceleration problem

  1. #1
    Junior Member
    Join Date:  Jan 2019

    Location:  Ponchatoula, LA

    Posts:    13

    My VIN:    SCEDT26T8BD004207

    cold acceleration problem

    Having a cold acceleration problem. Acceleration is fine after warm up The pressure regulator pressure is 30PSI at 66deg.drops to about 20PSI upon acceleration. The engine hesitates and black smoke comes out of the exhaust The regulator pressure takes about 7 seconds to reach the set pressure after cold start. I don't know if this correct or causing problems. any suggestions
    Thanks
    Hilton

  2. #2
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    8,354

    My VIN:    03572

    What pressure are you stating? Primary pressure should always be 75 PSI hot or cold. Control pressure starts out around 20 PSI cold and after warmup is running around 50 PSI.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  3. #3
    Junior Member
    Join Date:  Jan 2019

    Location:  Ponchatoula, LA

    Posts:    13

    My VIN:    SCEDT26T8BD004207

    poor acceleration

    Quote Originally Posted by Bitsyncmaster View Post
    What pressure are you stating? Primary pressure should always be 75 PSI hot or cold. Control pressure starts out around 20 PSI cold and after warmup is running around 50 PSI.
    warm up pressure regulator 30PSI at 66deg, 20 PSI when accelerating when cold. 52PSI after warm up .Primary pressure 75PSI

  4. #4
    Administrator Ron's Avatar
    Join Date:  Jun 2011

    Location:  North GA

    Posts:    5,889

    Club(s):   (SEDOC) (DCUK)

    Pressures seem ok.
    Do you have the delay valve oriented like this (white toward Tee)?:
    DelayValve.jpg

  5. #5
    Junior Member
    Join Date:  Jan 2019

    Location:  Ponchatoula, LA

    Posts:    13

    My VIN:    SCEDT26T8BD004207

    Delay valve

    Quote Originally Posted by Ron View Post
    Pressures seem ok.
    Do you have the delay valve oriented like this (white toward Tee)?:
    DelayValve.jpg
    White in toward Tee

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