Question about BMW 320D
Car starts but stops after 30 seconds maximum
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Posted on Jan 02, 2017
SOURCE: when i start the car
Hello Almo. Most likely these symptoms are caused by either a vacuum leak or a bad Idle Air Control valve or IAC valve. If the IAC is toast (and stuck in one position), it would cause the
same exact symptom as a vacuum leak.
Spraying WD-40 around any potential areas that could be leaking should
help discover if you have a vacuum leak. Using carb cleaner would be
OK around metal, but would further dry out rubber hoses.
Also, on a vehicle that is 10 years old, checking the vacuum hoses
would be a good idea and would be a very likely source of a vacuum
leak. Spraying WD-40 or on the hoses would yield the same discovery
if there is a leak. All said, consider the following:
1. Check vacuum hoses - use WD-40 to help diagnose
2. Check for vacuum leaks around gaskets - again use WD-40
3. Check and replace (if necessary) the IAC valve ( or step motor) -
Posted on Nov 13, 2010
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