Question about 1990 GMC C1500

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How do you set the idle speed on a 1990 GMC

How do you lower the idle speed on a 1990 GMC throttle body?

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Idle speed for this model is non adjustable

Posted on Apr 30, 2010

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Posted on Jan 02, 2017

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1 Answer

What is the main problem for a very high idle ?


The most common causes are a stuck idle air control valve, a problem with the throttle plate, or a vac leak.

Nov 28, 2015 | GMC Cars & Trucks

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I have a 1990 S-15 with 4.3 motor idles high when you start, idles down , set and idle for a while it starts idling up and down.any idea's?


Could be a faulty idle air control valve.
The computer controls idle speed by regulating how much air enters the throttle body thru the valve.
You could unplug the valve when the idle speed is close to normal, then shut the engine off and restart to see if the idle speed is still in the same place. Unplugging the valve will also set a trouble code and turn the warning light on.

Mar 07, 2013 | Chevrolet Cars & Trucks

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How to clean throttle body on 2005 gmc canyon 3.5l


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

1 Answer

Fast idle 90 GMC Sierra


if you haven't disconnected the battery try that next

May 24, 2017 | 1990 GMC Sierra

1 Answer

Idles up and down and hesitates under a load


Without a steady idle rate, its bound to act up when there s load on it cos with the fluctuation the idle might be too low at some point. Things to look at will be the idle control solenoid, throttle body, MAF sensor, check if carbon tracked then clean out throttle body with carbeurator cleaner.

Sep 11, 2011 | 1990 GMC Sierra

1 Answer

Hi i have a code reading P0506 for a 06 GMC Envoy XL any recomondations


{: ) DTC P0506 Idle Speed Low
The usual cause is an excessive carbon build-up on the throttle body. If this is the case, I suggest you have your throttle body cleaned and perform an idle relearn procedure using a GM scan tool. The idle relearn or reset procedure is very important, otherwise this code may still remain even after a throttle body clean.
In a similar fashion, if the ECM/PCM (engine control module) of a high mileage vehicle is replaced and/or reprogrammed without performing the Throttle/Idle Learn procedure, the ECM/PCM may no longer compensate for existing carbon build up in the throttle body, causing it to return with a similar concern as well as DTCs P0121, P0506, and/or P0507.
There are other conditions that can also affect or reduce idle speed by increasing engine load like incorrect torque converter clutch (TCC) operation, accessories that require additional torque to operate, restricted exhaust, and mechanical conditions that limit engine speed.

Aug 02, 2011 | 2006 GMC Envoy

1 Answer

1990 GMC 350 engine stops while idling at light. Replaced distributor cap,rotor, spark plugs and cables, new battery. and air filter. Engine is running without missing and no hessitation. Starts strong...


The Idle Air Control runs idle speed, it may be stuck or just bad. its located at the left rear corner of the throttle body, make sure its plugged in.

Dec 06, 2010 | 1990 GMC Sierra

1 Answer

Idling problem toyota altis


Either there is a vacuum leak causing the high idle, or
the IACV is bad or being controlled by the computer to make idle speed too high:

To change the IACV refer to the following:
Idle Speed Control (Idle Air Control) Valve Removal & Installation To Remove:
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Remove the throttle body. Idle speed control valve toy_cor-04-18-1187.gif

  3. Remove the 3 mounting screws from the throttle body. Remove the idle speed control valve and gasket.
To Install:
  1. Using a new gasket install the idle speed control valve on the throttle body with the 3 mounting screws.
    • Tighten 33 inch lbs. (3.7 Nm).
  2. Install the throttle body.
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Jul 16, 2010 | 2004 Toyota Corolla

1 Answer

1990 gmc 305 where is the Idle Air Control located


The iac motor is on the throttle body It screws into the passenger side of the throttle body. It has a hex on it to put a wrench on. It's about 1" to 1 3/16" in size,(the hex) can't miss it.

Feb 16, 2009 | 1990 GMC Sierra

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