93 k1500 shifting probs and high idle

Discussion in 'Chevy Truck Forum' started by Natas 9000, Jun 30, 2010.

  1. Natas 9000

    Natas 9000 Full Member

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    K so I have a 93 Chevy Ext. Cab k1500 with a 5.7 TBI, Auto trans.
    I'm having issues with the motor idling pretty high, the trans jumps into gear with I shift into Drive, and I have to rev my truck up for it to shift up? Any ideas what to look at first:idea:. Thanks in advance for all your help:D.

    Just had a tune up plugs, wires, cap, rotor, and about a month ago a new ignition module (in distributor).
    Was driving just fine then lone and behold **** lol. So if anyone has any ideas, I've read alot of threads and post, sounds like people try alot of things to no avail so I figured I'll ask first. Thanks again everyone!
     
    Last edited: Jun 30, 2010
  2. bradrhale

    bradrhale Senior Member

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    TPS would be the very first thing that i look at. all your symptoms including the late shifts points to exactly that. there is a TPS diagnostic chart located in The Reference Thread in the general truck section on how to test this with a halfway good multimeter. if this does turn out to be the problem, clean out the port that the TPS reads out of on the side of the TB as this can develop pretty heavy carbon deposits in there. do not spray the TPS or IAC as this can cause them to fail.

    TPS, throttle position sensor, should be loacted on the drivers side of TB
    IAC, idle air controlling sensor, should be located on the rear side of TB
     
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  3. Natas 9000

    Natas 9000 Full Member

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    awesome thank you I will look into that.
     
  4. mudseeker

    mudseeker Senior Member

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    also look for a vac leak at the throttle body gasket. spray carb cleaner at the base of the throttle body, if it attempts to stall or does, then you found your problem.
     
  5. Natas 9000

    Natas 9000 Full Member

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    TPS was the problem thanks for your help. I did the carb cleaner first thinking that was the problem. But faulty TPS is to blame. Bought a new one and put it on runs great.
     
  6. crabtruck

    crabtruck Senior Member

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    Good to hear you got it Natas.
    Thanks for the update, helps everyone.
     
  7. bradrhale

    bradrhale Senior Member

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    good deal. did you clean the port for the TPS also?? alot of times, the buildup will contribute to the failure of the sensor. remember that an ounce of prevention is worth a pound of cure.
     
  8. Natas 9000

    Natas 9000 Full Member

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    yeah I did, took it off cleaned it. Thanks again for all the help
     

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