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Thread: Troubleshooting Lift Pump

  1. #71
    Join Date
    Feb 2007
    Posts
    2,944

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    Let me know if you find the problem. I went on long drive yesterday, and 1 hour from home at night, the volt meter was reading very low, I guessed it was the alternator regulator failure, the suburban had that twice in 10,000 miles. I stopped to check the belt, nearly removed the end of of my finger by touching the alternator fan which looked stopped, then on leaving the gauge showed normal voltage.
    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 #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, new engine, 0 miles. 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  2. #72
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    207

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    So this is what I know at this point... The volt gauge hasn't worked in the 11 or so years that I have owned the truck. In that time I have replaced both the alternator and the ignition switch so, my suspicion is the gauge itself and I am putting it low on the list of repairs. As far as the transmission, I have not had the limp mode repeat since it happened the once. I took it to the transmission shop and they said it looked good. When they rebuilt it several years ago they put a new VSS in it, so I'm going to wait to see if the problem repeats itself. I am however getting a 96 code but without a SES light. The 96 is supposed to be a cylinder balance issue with the #6 Cylinder. Though I can't think of what would cause that other then a bad/plugged injector. The injectors are new and I was very careful to make sure they were clean and the lines were also, when I put everything back together. Truck seems to run fine.
    Mike
    1994 K2500 Suburban 320,000 mi., F VIN, 4L80E, 3.73 w/posi., 3" turbo back, no cat, FSD Heat Sync, #9 resistor, SSD heads, SSD intake, fuel miser injectors, Bastard IP (5068), 4x4 posi (manual front axle lock), Cooling upgrade w/duel 180° t-stats and d-max fan

  3. #73
    Join Date
    Feb 2007
    Posts
    2,944

    Default

    I'm just back from a 8 hour drive, some in the dark, and no gauge problem this time. I don't understand how the IP sees the cylinder imbalance. Ignore codes if nothing is malfunctioning. Your VSS signal is likely a connector problem.
    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 #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, new engine, 0 miles. 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  4. #74
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    207

    Default

    Ok, thanks Grant. I'll keep an eye on it.
    Mike
    1994 K2500 Suburban 320,000 mi., F VIN, 4L80E, 3.73 w/posi., 3" turbo back, no cat, FSD Heat Sync, #9 resistor, SSD heads, SSD intake, fuel miser injectors, Bastard IP (5068), 4x4 posi (manual front axle lock), Cooling upgrade w/duel 180° t-stats and d-max fan

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