Question about 1990 GMC C1500
How do you lower the idle speed on a 1990 GMC throttle body?
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Nov 28, 2015 | GMC Cars & Trucks
Jun 19, 2014 | 1988 GMC C1500
Mar 07, 2013 | Chevrolet Cars & Trucks
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
Oct 08, 2012 | 2005 GMC Canyon
Sep 11, 2011 | 1990 GMC Sierra
Aug 02, 2011 | 2006 GMC Envoy
Dec 06, 2010 | 1990 GMC Sierra
Jul 16, 2010 | 2004 Toyota Corolla
Feb 16, 2009 | 1990 GMC Sierra
270 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: