Question about 1999 BMW 318 ti

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BMW 318i 2000

Hi All

Having trouble with motor keeps cutting out when stopping or idling. Have tried repacing air flow pipe, and cleaning filter valve, still no luck, any ideas you chaps?? ;)

Tracy

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  • ingrammoore
    ingrammoore Jan 13, 2009

    Thanks simulator, I dis-connected the air flow meter, and runs well now so looks like I do need a new one........ Any idea of how much I should expect to pay for a new one to be fitted??



    Thanks again for your response



    Tracy

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I had the same problem and it was the airflow sensor that was on the way out. good luck

Posted on Jan 11, 2009

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Vane air flow (VAF) units are a common failure on these cars. It is the the sensor mounted inline on your intake tube that is aluminum and black plastic with a round twist plug. If you unplug it an it runs better that is most likely your culprit. The gentleman above is on the right track. Intake boot cracks/failures are quite common on these older cars too as are the EGR tubes/hoses - listen for air leaks/sucking noises.

The idle air sensor (IAC), made by Bosch looks like a small coke can with two tubes and a plug going to it. Sometimes they are hard to find/hidden under intake. They do go bad, but can usually be cleaned with car/brake cleaner. The internals should rotate; they are just an oscillating valve that regulates extra air to the intake.

You never said it it runs fine once it us up and going. If it does, it could also be a oxygen sensor. You should really consider having the codes read... it really shortens the list of parts to check!

Good luck!
-Scott
www.europartsplus.com

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