General Tech Good at troubleshooting? Have a non-specific issue? Discuss general tech topics here. IF YOUR QUESTION IS SPECIFIC TO A CERTAIN MODEL, IT DOES NOT GO IN THIS SECTION.

1988 K2500 Fast/high idle

Old December 4th, 2009, 11:13 PM
CF Beginner
Thread Starter
Join Date: Dec 2009
Posts: 4
Default 1988 K2500 Fast/high idle

1988 k2500 5.7l 4wd

Let me just start by saying thank you for all the info on this site. I have been lurking for a while, using past threads to solve problems. I have a problem now that I cant figure out.

The motor is a TBI 5.7l with 124,000 miles. It runs strong, burns little to no oil. It idles around 1300 rpm pretty consistently. Ive changed the Iac, and have not noticed any obvious vacuum leaks. Any thing simple that I am missing? When the tranny is in gear (auto) It idles around 500rpm like it should, but it wants to get moving with that much load on the engine.

Also, Ive had a problem with the ESC. It was setting a code 43, and the truck would just run crappy, like it had the flu. Shut it off then restart, runs fine. Get hard into the throttle, Check eng light comes on and it runs poopy again. I use only 91 octane fuel, and I have replaced the ESC. Still have the problem. Would the fast idle be a symptom of this underlying problem? Again, Thank you in advance for any and all insight that you may have. Jason.

Last edited by JAYROCK; December 4th, 2009 at 11:14 PM. Reason: truck info
JAYROCK is offline  
Old June 1st, 2013, 1:25 PM
CF Beginner
Join Date: Jun 2013
Posts: 1

im having same problem but Check engine soon light won't go out. any help out there?
Maverick442 is offline  
Related Topics
Thread Starter
Last Post
February 1st, 2014 7:53 AM
Tahoe & Suburban
November 12th, 2012 5:22 PM
General Tech
August 31st, 2012 4:45 AM
Express & G-Series Vans
August 15th, 2009 7:36 PM
Stan S
Silverado & Fullsize Pick-ups
July 13th, 2009 9:49 PM

Thread Tools
Search this Thread
Quick Reply: 1988 K2500 Fast/high idle

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: