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E46 General discussion and technical help for 1999-2004 3 series cars.

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Old 06-16-2010, 10:34 AM   #1
leeella

Name: leeella
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engine squeal

i have a 99 318i 1.9 after the engine has been running for a while i get a squealing/screaming sound from the engine.
i have checked the belts alternator etc they are all fine.
the noise is from the vac system somewhere any ideas would help.
Also when i try to take the oil cap off with the engine running i cant because the suction is this normal

Last edited by leeella; 06-16-2010 at 10:35 AM..
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Old 06-18-2010, 09:43 AM   #2
Big Evil
 
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Could be a bad pcv valve. I've seen a number of beemers through my shop the last few months with similar complaints and it has been predominantly bad idler pulleys. Have had a frozen water pump, and a couple of hooter valves (pcv's).
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Old 06-30-2010, 10:12 AM   #3
leeella

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Hi i changed my pcv valve and the car now runs better and no more squealing
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