Question about 1993 Geo Metro
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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Posted on Jan 02, 2017
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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
Getting this possibilities checked will help.Thanks.Helpmech.
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