1991 Acura Integra idle

Tiny
FRUITCAT79
  • MEMBER
  • 1991 ACURA INTEGRA
1991 Acura Integra 4 cyl Front Wheel Drive Manual HAHAHA miles

my car idles in between 1000-3000 Rpms and there is no check engine lights. I have been told that the Iac was the problem and will cause the A/C to more or less blows hot air (A/C was converted one month ago and blow hot (had the car 10 years I know how to trun on the A/C) I was not all that happy with that repair shop and just double checking that I was given the right info before I spend the money
thank you
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Sunday, April 5th, 2009 AT 9:55 PM

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Tiny
RASMATAZ
  • MEMBER
Too fast an idle speed. If an engine without computerized idle speed control is idling too fast and refuses to come down to a normal idle speed despite your best efforts to back off the carburetor idle speed screw or air bypass adjustment screw (fuel injection), air is getting past the throttle somewhere. Common leak paths include the carburetor and throttle body gaskets, carburetor insulator spacers, intake manifold gaskets, and of course, any of the engine's vacuum fittings, hoses and accessories. It is even possible that leaky O-rings around the fuel injectors are allowing air to leak past the seals. Another overlooked item can be a worn throttle shaft and a defective idle speed speed control motor/valve stuck in the extended (high idle speed) position/throttle position sensor. Also the throttle plate could be binding in its bore and kinked accelerator cable, coolant temperature sensor might not be operating properly misleading the computer that the engine is still cold and computer throwing fuel at it raising the idle speed.
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Sunday, April 5th, 2009 AT 10:13 PM
Tiny
FRUITCAT79
  • MEMBER
I do not believe my question was read or I was not very clear. There is NO carburetor in my car it is a 1991 and there is no over heating porblems. I was asking if iac could be the root problem for both the a/c and the idling.
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Sunday, April 5th, 2009 AT 10:41 PM
Tiny
KHLOW2008
  • EXPERT
Hi fruitcat79,

My fellow technician is offline and I will be assisting. He posted an excerp and it mentioned either carb or injection to cover both.

For your model the IAC can cause the problem of high idle but quite often it is the fast idle valve that is the culprit. However high idling speed would not cause the AC to blow hot air. In fact a higher idling speed should have the AC working colder. This should be a separate problem.

The fast idle valve is located under the throttle body. Remove air intake hose and at bottom of throttle body you would notice an air passage, if covering it with your finger reduces the idling speed, the valve has worked itself loose due to a hardened O ring.

If it does not reduce the idling speed, cover the upper air passage, if it reduces the idling speed, the IAC is afulty.

If both does not reduces the idling speed, you have a vacumn leakage after the throttle plate, could be brake booster, PCV or inlet manifold gasket.
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Monday, April 6th, 2009 AT 10:24 AM

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