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Thread: 6.5 turbo 2001 van won't drive over 25 mph

  1. #1
    Join Date
    Nov 2015
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    6

    Default 6.5 turbo 2001 van won't drive over 25 mph

    replaced head injectors glow plugs and exhaust manifold now it wont drive over 25mph it acts like the valves are floating but I know they are not... it stumbles and runs erratic as long as you keep giving it fuel we you let off fuel pedal it clears up and it will do it all over it also will do it if you just power brake it.....it idle perfect for hrs. also have had pmd checked it works fine on another vehicle

  2. #2
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,807

    Default

    It has a fuel supply problem, check the fuel filter first. I had that with a load of bad fuel that blocked the filter. If the intake manifold has been removed, the OPS or it's connection can be damaged, happened on both my vehicles, check to see if the lift pump is running.
    Last edited by grancito; 12-07-2015 at 11:45 PM.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  3. #3
    Join Date
    Nov 2015
    Posts
    6

    Default 6.5 turbo

    Quote Originally Posted by grancito View Post
    It has a fuel supply problem, check the fuel filter first. I had that with a load of bad fuel that blocked the filter. If the intake manifold has been removed, the OPS or it's connection can be damaged, happened on both my vehicles, check to see if the lift pump is running.
    new fuel filter lift pumps runs for a bit when ign. is turned on and gauge shows oil pressure also

  4. #4
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,807

    Default

    Lift pump runs on a different circuit for starting. The OPS contains an oil pressure sender and a lift pump switch, the switch fails. Check that the lift pump is working when the engine is running.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  5. #5
    Join Date
    Dec 2008
    Location
    Conesus N.Y.
    Posts
    100

    Default

    If the pump is running when engine in running it could be the fuel pickup in tank is clogged.
    I have a 1997 horton 4X4 ambulance converted into a motor home. New hot glow plugs, remote PMD and cooler and air induction kit. New duramax fan and 180 degree thermostates. I also own two 99 suburbans.

  6. #6
    Join Date
    Nov 2015
    Posts
    6

    Default

    how many wires to oil pressure sensor I can only see one but looks like their may be more 2 or 3 total?

  7. #7
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,807

    Default

    There are 3 wires.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

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