Question about 1990 GMC Sierra

1 Answer

1990 gmc 305 where is the Idle Air Control located

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 150 Answers

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.

Posted on Feb 17, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic 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 repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

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

1 Answer

I don't have a 2004 jeep wrangler I have a 2004 GMC ENVOY< PLEase tell me where the idle air control valve is located on MY CAR!!!

Here's a link
It shows how to clean, and reinstall the throttle body on a 4.2 inline 6 trailblazer. which I believe is very much like your Envoy. The idle air control valve is located on the & is part of the throttle body It's the part the wires attach to

Jul 14, 2013 | Cars & Trucks

1 Answer

Where,exactly, is the idle air control valve on a 2004 envoy located

It should be mounted on the side of the throttle body. But if it is bad you should also have a check engine light on and a stored trouble code for the valve.

Jul 14, 2013 | Cars & Trucks

1 Answer

Idle air control valve

Remove the gas cap,and then remove the return fuel line off the back of the throttle body.Now take a air hose and blow in the line you removed to make sure it is not clogged up,you should be able to blow back threw the tank easy with compressed air.If you are able to,then replace the fuel pressure regulator on top of the throttle body.

May 12, 2013 | 1990 GMC Sierra

1 Answer

Where is the idle air control valve on my 2002 gmc denali?

should be mounted on the side of the throttle body

Jul 31, 2012 | 2002 GMC Yukon Denali

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

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

Truck starts, but then stalls, will not restart just keeps cranking, replaced fuel pump didn't fix . 1997 gmc sierra, 305 engine, 4 wheel.

have you tried to start it with your foot on the gas about 30 %. My question is are you sure its not just a issue with maintaining an idle. This would indicate a bad idle air control valve. Unless you have some readings to go on like fuel pressure and data for the maf and various sensors all we can do is guess also. It may be you have a failed computer but without any testing or data its anyones guess.

Aug 01, 2010 | 1997 GMC Sierra

1 Answer

How do you set the idle speed on a 1990 GMC

Idle speed for this model is non adjustable

Apr 30, 2010 | 1990 GMC C1500

1 Answer

1989 pontiac firebird 305 v8 starts and idles

Your idle air control valve may be dirty or the wire harness may be damaged. First try cleaning the throttle body with throttle body cleaner and make sure you use all the can up and try to get the idle air control valve cleaned. A faulty or dirty idle air control valve will cause engine to stall when put in to gear from idle. Good luck and hope this helps. Keep me posted, be glad to help you get your car running 100% soon.

Aug 08, 2009 | 1997 Chevrolet Cavalier

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

157 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

77499 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides