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Old 02 Mar 2012, 12:01 pm
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Default I have a 1998 Honda accord ex what would cause it to isle up and down in park and reverse...

...but not in drive?
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Old 02 Mar 2012, 12:16 pm
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The most common cause is a bubble in the coolant driving the Fast Idle Thermo Valve nuts. There is a bleed nipple on top of the upper radiator hose housing on the engine (maybe on the thermostat housing on some models). With the engine cold, open that nipple 1/2 turn with a 12 mm socket and close it when a steady stream of coolant comes out. That needs to be done whenever the coolant is drained and refilled.
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