Any suggestions? Failing lambda sensor perhaps?
Please help....this is the mother in law's car and it would make my life much more peaceful as well as earning major brownie points with the wife!!
Matt
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Check the coolant level in the radiator with the engine cold. If it is low the sensors drive the ECU nuts and the idle hunts. If the level is low, you have a leak hunt ahead of you. The radiator is probably like the one in my daughter's '93; it has a flat spot on top where a brace crosses. Look for a crosswise hairline crack there where the flat spot flexes.
Mike
Mike,
Does this particular model also use an Idle Air Control Valve? Can a bad IACV also produce this same type of idle surge?
Ron M.
"Ron M." wrote
I am pretty sure it does, though it may be called an EAC valve on this model.
I agree that's possible.
I concur with Mike's suggestion. In the same vein, do an air purge of the cooling system; a thorough one, where the radiator fan comes on twice (which may take 45 minutes of idling, so be patient).
Also, the oxygen sensor is suspect, too, particularly if the problem only occurs after the car is warmed up.
I had an earlier model Integra with a bad airflow regulator and it would display similar results, though it mainly happened when the engine was cold. The valve contained a "thermo-wax plunger" which had become deffective, resulting in differences of airflow into the injectors (or that's how it was described at least). As opposed to slowly closing proportional to engine temperature, it was erradic.
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