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  1. #1

    Default 98 tahoe shifting problem

    when ever i punch the gas my truck doesn't let me shift unless i release the gas a little bit. but it only does this when i punch it. normal city driving i dont have a problem
    98 Chevy 2 Door Tahoe
    K&N Cold Air Intake
    Flowmaster 40 Series

  2. #2
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    murdog94's Avatar
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    Is the CEL lit?? Also try a sweep test on the TPS since that could be misreading and sending a poor signal to the computer.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  3. #3

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    I have the same problem engine revs but it doesn't down shift untill I let off the gas a little

  4. #4
    Sr. Mechanic trapperdon's Avatar
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    mine just took a crap on me the same way yesterday, just as i got into the fast lane of the freeway, not good !
    couldnt get it to upshift above 50 mph, had to limp it home.

    last night ( this morning at 3 am ) on way home from work it wouldnt shift from 40 mph, then when i could
    finally coax it to shift i'd get to about 56 mph and it would act like it was a manual tranny in 2nd gear at high rev...

    i am on vacation as of today, was going to replace the entire suspension & bushings and do a write up,
    but getting it to be able to drive right now takes top priority !!

    would it be vacuum lines to the tranny or would it more likely be something in the TBI or related systems
    that would cause it to fall flat and not shift?

    i'm better at helping other people with probs, i get braindead when diagnosing my own issues...
    :fighting0037:
    when in doubt, doubletap !

    - buying a new truck, one part at a time :grrrrrr:
    94 Blazer 4x4 k1500 5.7 L - aftermarket cold air intake
    Energy Suspension swaybar & upper and lower control arm bushings
    Pro Comp ES 9000 front shocks, new front drive axles,
    stainless front brake rotors & new pads,
    new Moog front end ball joints, Smittybilt black nerf bar steps,
    MB Racing rims & Hankook ATm off road tires

  5. #5
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    I would do a sweep test on in the TPS, also you might have a bad solenoid on your truck.. And did the CEL come on? If it did i would pull the codes.

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