Question about 1989 Honda Prelude

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97 acura integra idle rough when cold and

I replaced the idle air control valve

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Where are the rpm's at when its idling cold?

if the cold idle is below 1500 rpm. adjust it by tightning/loosing the intake spring located on the intake manifold.

if it does it reguardless of rmp. replace the spark plugs.

Posted on Aug 14, 2009

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My 91 acura integra is stalling after idling for just a few minutes. I just bought the car and it ran fine until just recently. I also noticed a gas smell after the car started again.


Idle is controlled by two main sensors: the FITV and the IACV. The FITV is a mechanical valve that is controlled by coolant temperature (there is no ECU plug to it). When the coolant is cold, the valve is open and letting air into the Intake Manifold through a hole in the Throttle Body above the throttle plate. This creates a small vacuum leak which in turn lets the motor idle higher than normal (supposed to be above 1K RPM for warming up). As the coolant warms up the valve closes and no longer lets air in through the hole in the throttle body. From this point the IACV, which is Engine Control Unit controlled, is letting small amounts of air into the Intake Manifold through another hole in the Throttle Body. Any amount of extra air the ECU is not expecting will confuse it and you will get either a high idle or a roaming/hunting/fluctuating idle. The principal of engine to operate is a need to have a Fuel : Air ratio of 14.6:1. You smell the gas after restart since the unburnt gas, when the engine dies, got pushed out through the exhaust manifold.
Th following are in order one after the other until it fix problem.
1- Find and replace the vacuum leak on hoses mentioned above.
2- Clean the the gunk built up at holes mentioned above.
3- Replace thermal valve at engine block identified by two vacuum hoses connecting to the Throttle Body.
Good luck.

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