Question about 1993 Geo Metro

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Fast idle the engine idles fast, the colder the outside temp, the faster it idles. I have no fault lights, it is a 93 throttle body fuel injection. The is a small canister on the intake manifold, about 1.5 inches in diameter and about 3 inches long, it has a vaccum tube attached and when I put my finger over it, the idle slows down??? I am not sure what it is called, can't find a discription of it in the manual or where is should be hooked to. Joel

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  • Anonymous Jan 21, 2009

    my car has the same problem i think it has to do witht the air chamber sysytem in conjunction with the IAC valve see hood diagram

  • Clayton McCune
    Clayton McCune May 11, 2010

    How long is your vehicle idling like this for?

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Your fast idle problem might be caused by your coolant temperature sensor not getting a good flow of hot coolant. The sensor is mounted up on top of your throttle body. Here's a test: after you have just made a trip, put your fingers on the area where the coolant temperature sensor is. It should be very hot, but I suspect yours will be only lukewarm. Unless that sensor gets hot, your computer will stay in the "warmup" mode forever. Your idle speed will not be controllable, your fuel mileage will be poor and your engine will run a little hotter than normal. The coolant flow needs the throttle body to pass fluid freely and also your interior heater core is part of that flow, so that can't be obstructed either. The coolant flow ports are very narrow and sometimes they get a piece of gasket sealer caught in the throttle body. Get some air and blow it out. Good Luck, friend.

Posted on Feb 15, 2009

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