1. Welcome To GMTruckClub.com!

    The #1 Chevy Truck Forum Online
    Online since 2004, we are the #1 Chevy Truck & SUV forum and user community. If you have any questions about your Chevy or GMC Truck, SUV or Crossover, or just want to connect with other GM owners and enthusiasts around the world, you've found the best place on the internet to do that.

    Join Today ~ It's Free
    Registering is Free and Easy! Hope to see you on the forums soon!

high idle/ high engine compartment heat

Discussion in 'General Chevy & GM Tech Questions' started by lynx, Sep 4, 2010.

  1. lynx

    lynx New Member

    hello,
    I have a 90 gmc 3500 4x4 454
    my problems are these : engine seems to idle to high warm or cold. at idle truck will acccelerate to over 30 mph on level ground,seems faster in reverse. have replaced air throttle control, new throttle body gasket.

    next problem:
    way to much heat in engine compartment,can cook on hood and fenders after even a short drive. has new cat and muffler dual exhaust. any ideas?
  2. Chris Miller

    Chris Miller New Member

    Check where your cruise control cable goes in, if you have that. It might be cranked in, which would raise the idle way above normal.
    As for the heat issue, does your hood have insulation on the underside? Also, that could simply be caused by the first issue.
  3. lynx

    lynx New Member

    i would be happy to do that if i knew where cruise cable was connected at.:money:
  4. murdog94

    murdog94 New Member 1000 Posts

    Same bracket that your throttle itself connects on the Throttle body. Also have you taken a look to be sure the IAC servo was actually working when installed? Sometimes they will be bad brand new, and they can also be getting a poor signal and not work. And are the throttle blades closed all the way?

Share This Page