GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 6 of 6
  1. #1
    Jr. Mechanic
    Join Date
    Mar 2010
    Location
    Montana
    Posts
    134
    Blog Entries
    1

    Default faster n faster gerr

    Hello all been a bit. Hope every one is ready for Christmas.
    So my 97 gmc with 5.7 has been acting strange. My truck will normaly slow its self down
    When heading down hill or when letting off the gas. Kind of like a engines break.
    It now acts as if it jumps into a coast now. I can tap the gas and not sticking.
    You guys have any ideas ? It's not a big deal if roads are dry but with ice and ridding the breaks
    Makes for a fun wrong way slide down the steep hills.
    1997 gmc k1500
    v force muffler
    duel tips
    3 inch pipe
    KnN air filter
    Good year authority tires
    160000 miles and counting
    2 intake gaskets
    1 trany
    1 water pump
    1 alt
    I love my truck !!!!!

  2. #2
    Legend
    TRPLXL2's Avatar
    Join Date
    Jan 2009
    Location
    Norwalk, Ohio
    Posts
    3,359
    Blog Entries
    8

    Default

    Sounds like a bad torque converter, or the pwm solenoid is bad in the valve body.
    2004 Chevy Colorado
    LS1 5.7 swap/TBSS rear axle swap

  3. #3

    Default

    I think your "off the gas" engine speed is too high, what does the tach read when you are idling?

    For a down hill test, shift the transmission into NEUTRAL and watch the tach. Your truck has a throttle cable (I think) and in neutral, the engine rpm should return to idle speed.
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  4. #4
    Jr. Mechanic
    Join Date
    Mar 2010
    Location
    Montana
    Posts
    134
    Blog Entries
    1

    Default

    Quote Originally Posted by RayVoy View Post
    I think your "off the gas" engine speed is too high, what does the tach read when you are idling?

    For a down hill test, shift the transmission into NEUTRAL and watch the tach. Your truck has a throttle cable (I think) and in neutral, the engine rpm should return to idle speed.
    It runs about 450 when warmed up I'll try down hill test tonight
    1997 gmc k1500
    v force muffler
    duel tips
    3 inch pipe
    KnN air filter
    Good year authority tires
    160000 miles and counting
    2 intake gaskets
    1 trany
    1 water pump
    1 alt
    I love my truck !!!!!

  5. #5

    Default

    Quote Originally Posted by cobra2end View Post
    It runs about 450 when warmed up I'll try down hill test tonight
    Ok, let us know.
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  6. #6
    Jr. Mechanic
    Join Date
    Mar 2010
    Location
    Montana
    Posts
    134
    Blog Entries
    1

    Default

    Rpms dropped when going down hill in neutral. Could the cold weather make this happen? It didn't start till it for to -20 and has not stopped now that it has warmed up a little. The transmission only has 75k on it
    1997 gmc k1500
    v force muffler
    duel tips
    3 inch pipe
    KnN air filter
    Good year authority tires
    160000 miles and counting
    2 intake gaskets
    1 trany
    1 water pump
    1 alt
    I love my truck !!!!!

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •