Got a 94 Accord,2.2L with manual trans.Engine rpm's can race to 2000
when engine is hot and while driving in stop and go traffic.Seems to
coincide with the warmer wheather and air going into the throttle body
as it seems to be fine while highway driving.I know the IACV is
working properly when first starting the car but can it stick when the
engine is hot?Map sensor?~thanks
Is it fluctuating between high and low?
First, with the engine COLD, remove the rad cap. Is the coolant right up to
the top of the rad filler neck? If it's low, top up, fill the reservoir as
needed, and see if that helps the idle. If not...
With the engine fully warm, remove the air pipe from the air cleaner to the
throttle body. Start engine. With idle high or fluctuating, block the LOWER
port in the throttle body with your finger. Does the idle settle down? Then
it's the Fast Idle Thermo Valve, under the throttle body.
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