Question about 1995 GMC Sierra C1500

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Idle problem I have a high idle when started

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Problem could be the coolant sensor defect or a vacuum leak or IAC valve drag or stuck

hope it help

Posted on Feb 03, 2015

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Posted on Jan 02, 2017

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1 Answer

Idel to high starting, warm to low sometimes dies


What is to high? 2000RPM, 2500RPM? Also cold idle and start up idle and many other factors vary with make, model and type of engine, smaller engines in most cases need a high start up idle.

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High idle at start up 2200rpm then slowly drops but always seems high have to ride brakes to stop


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1 Answer

My van is idle high i cleaned the throttle boady and it idle down the a few hours later its high idle again why i replaced two sensor and still idle high


Hi Alexandra, Im AL the owner of Big As Auto Repair

There are several things that can cause high idle, but the 2 most common problems are as follows.

(1) You could have a vacuum leak somewhere on the engine. Here is how to check for that issue. Here's what I want you to do: Buy a can of CARB Cleaner and while the engine is running spray around the Intake Manifold, the manifold is the thing the throttle body sit on. Also spray around all the vacuum line as well. If while spraying there is a change in the idle speed then you have found your leak. If there is no change then move on to step 2.

(2) Sometimes when you have a high mileage vehicle parts begin to ware out or can also begin to stick in place. Here something you can check. Idle Air Control Motors can start sticking from corrosion build up and can cause a high idle issue. Here what I want you to do. Start the engine and let it idle, while its idling I want you to tap on the Idle Air Control Motor If it idles down to normal idle speed replace the motor. The motor mounts onto the throttle body and most of them are round. Once you replace it and start the engine you'll notice that its idling real high, :This Is Normal, just let it idle until the engine controller resets the idle speed to normal.

Hope this helps and should you need further help please visit my auto repair website. http://www.bigasautorepair.com/

May 25, 2015 | Cars & Trucks

1 Answer

2001 dodge dakota sport with 2.5 engine idles high when I start it up, continues idling high, when pushing clutch in to change gears it idles extremely high


Does it do it if you disconnect the idle air control valve ?
You need to know if its a vac leak or if the computer is making the valve open too far.

Feb 09, 2014 | 2001 Dodge Dakota

1 Answer

High idle at start up


check your vacuum lines

Apr 01, 2013 | 1996 Chevrolet Corsica

1 Answer

High idle


It's probably one of two things , a vacum leak or a bad ground.

Dec 23, 2012 | 1989 Chevrolet C2500

2 Answers

High idle then low idle


just do induction / throttle body cleaning - will solve high idle on start up

Nov 12, 2012 | 2002 Chevrolet Impala

1 Answer

When starts idle to high?


Starts in high idle for the engine to warm up. When adjusting the throttle for idle speed, there is a screw for the high idle speed. Would not mess around with it if you don't know exactly what you're doing. The balance between the fuel and air mixture can easily go wrong.

Mar 20, 2010 | 1988 Nissan Sentra 2 Door

1 Answer

Idle high problem


check the idle air motor it may not be closing properly

Nov 16, 2008 | 1996 Pontiac Grand Am

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