GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 4 of 4
  1. #1

    Default high idle/ high engine compartment heat

    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. #2

    Default

    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. #3

    Default

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

  4. #4
    Legend
    murdog94's Avatar
    Join Date
    Feb 2008
    Location
    Cloquet, Minnesota, United States
    Posts
    8,198
    Blog Entries
    12

    Default

    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?
    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!!!!"

Similar Threads

  1. High idle rev w/ A/C on
    By letmusiclive in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 2
    Last: 06-29-2010, 09:49 PM
  2. heat only runs on high
    By dshewy14 in forum General Chevy & GM Tech Questions
    Replies: 3
    Last: 01-13-2010, 02:35 PM
  3. Dupli-Color High Heat Paint with Ceramic
    By zippy in forum Product Reviews
    Replies: 5
    Last: 06-15-2008, 10:57 AM
  4. High Idle
    By Chevyguy in forum GM Powertrain
    Replies: 5
    Last: 11-12-2007, 01:58 PM
  5. High Idle
    By Chevyguy in forum The Coffee Shop ~ Chit Chat
    Replies: 2
    Last: 09-20-2007, 10:09 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •