Thermostat vs Engine Idle Rough When Cold

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Old 05-03-11, 05:04 PM
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Thermostat vs Engine Idle Rough When Cold

1990 Honda Accord LX, 4DR, AT, 216K miles. Would a defect thermostat (partially or fully open when cold) makes engine idle rough when cold and normal when engine reaches normal operating temperature? When idle rough, engine is shaking and want to stop especially at drive gear like D4 gear. Once it reaches operating temperature, it works normal. If not a themostat problem, what else to check? Any idea?
 
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Old 05-03-11, 07:54 PM
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idle speed control valve. i am speaking based of my 91 Civic. cleaning that valve took a lot of shake out. it is operated, at least in part, by coolant running through it. gets clogged, just like drain pipes.

also, you engine mounts are getting there.

i simply rig idle rpms a little bit higher. there should be a flat head screw either under carb or throttle body, if you have CFI engine.
 
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Old 05-04-11, 03:08 AM
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could be lots of things put chevron injector cleaner through it. Gunk on the back of the valves can do this to
 
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