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Old 12-22-2004, 12:17 PM   #34
Scooby Newbie
Member#: 52625
Join Date: Jan 2004
Default My P0171 Story

Great guide - real neat idea that we have all these possible causes on one thread.

My P0171 story goes as follows:

Car started idling rough around 25,000 miles. Knew from previous car that air sensors get dirty so I tracked down the IACV solenoid and cleaned it with carb cleaner. I cleaned it when the engine was warm and the IACV gasket did seem mis-shapen.

Anyway, idle problem would come and go - one day fine, next day problems. This situation continued and I didn't have chance to look at it for 3 months.

Thing that brought mine to a conclusion was when my car started overheating! - I was losing coolant.

Turns out that the IACV gasket must have been leaking water into the air intake. I bought a new gasket and haven't had problems with idle since.

Moral of story is - either clean IACV when engine is cold (so gasket doesn't get misshapen) or buy a new IACV gasket ($8) when cleaning the IACV.

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samneric is offline   Reply With Quote