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How do i i know if my iac is bad? - 1995 Volvo 850

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If the IAC motor is defective, it will set a code on the vehicles computer system. You should have it scanned for codes by a repair facility that has the proper software. Symptoms of a defective IAC can be, hard starts, warm or cold, errattic idle, poor performance, hesitation.

Posted on Nov 18, 2009


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JUST to be safe, pull the 3 pin plug on the IAC while the engine is idling. Does the idle change (speed should increase or start to fluctuate)? If not, you've got another bad IAC or there's a problem with the wiring/PCM that's not permitting it to work properly.

The code indicates there is an problem with your Idle Air Control System. Most likely failure is that the IAC system failed. There is an 3 pin from the IAC. Remove it from IAC when your engine is idling.Check whether there is an idle speed change? IF it does not fluctuate then your IAC has gone bad,

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Whats will my car do if the idle air control valve goes bad

The engine will idle very rough or it will die at idle.

A simple way to test, try removing the IAC valve completely from the intake manifold, leaving an exposed opening to let air in the manifold. If the engine idles ok with the IAC removed, you'll know it's a problem related to the IAC. You will need further testing to determine if the problem is with the IAC valve itself or with its circuit.

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If my idle air control system is bad what kind of problems could this cause? What would be the effects?

A bad IAC unit will cause poor driveablility and poor/high idle, and also stalling and starting issues. There is really no harm by being bad but during rapid deceleration if the IAC does not catch the RPM's the engine could stall out; not a good thing if you were going 60 mph. Remove the IAC motor and clean the valve and also the chamber that it goes into with a good throttle body cleaner and that should really help. Carbon buildup is a big factor in IAC failure. Most CEL will not show a malfunction code with a bad IAC motor.

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How to fix mis firing of engine that cause shaking during idling for ford escape 2003

Sounds like it could be your Idle Air Control valve (IAC). The IAC does as it sounds and controls the idle in your vehicle. When these go bad, you can either clean them with a throttle body cleaner or replace them. Most people replace them as they are normally not very expensive and relatively easy to replace. The IAC is located on the throttle body which is where the air duct hose ends as it comes out of the air filter box. It is normally held on with a couple screws and just needs to be unplugged and plug the new one in. Please, please let me know if you have any further questions. If you can't find the location of the part let me know. Also if you don't think the IAC is your problem and have addition information that could point to something else, let me know. Here is a picture of what you are looking for: 656346b.jpg
This is the IAC for the 6 cylinder engine but it is different and more expensive on the 4. Let me know if you have the 4 and need a picture of it. Thanks for rating my response and for using FixYa!

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