Question about 1991 Acura Integra Hatchback

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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.

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I had a problem on my 1991 Acura after starting a hot engine it would almost die after a normal start. I think I determined the problem was a leaky fuel injector or leaky fuel bypass valve. I fixed it by using Marvel Mystery Oil in my gasoline. Put in 2 ounces of Marvel for every 5 gals of gas every time you get gas. Marvel Mystery oil does two things for your system. It cleans your injectors, bypass valve and it lubricated the shafts that can stick. It sure made my Acura run better. My daughter has a 2008 Honda and the Marvel is helping her car idle better. You might give it a try, its not expensive and won't hurt anything. Only 2 ounces per every 5 gals of gas.

Posted on May 15, 2010

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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.

Posted on Sep 28, 2009

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