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| 08-01-2022, 10:19 AM | #1 |
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Lieutenant
 
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Squeaking Noises When Engine is Cold
My car is at about 168,000kms or 104,000 miles; it's a 2012 N55 BMW 135i with DCT.
I noticed higher pitched squeaking noises coming from the engine Bay Area when the engine is cold. I can make the squeaking noise louder with throttle. As soon as the engine warms up, the noise disappears. Anyone know what this could be before I bring my car into a shop? |
| 08-01-2022, 02:30 PM | #2 |
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Second Lieutenant
145
Rep 219
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Normally I'd say PCV valve is bad, but that starts squeaking when it gets warm, and doesn't squeak when it's cold...
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hunginator154.50 |
| 08-02-2022, 02:47 PM | #4 |
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Brigadier General
 
1542
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Rhythmic squeaking? Probably belt and tensioner. Just got mine replaced.
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2011 135i w/ DCT | ZSP Sport Pkg | PPK | Ohlins R
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| 08-03-2022, 02:08 PM | #5 |
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Major
 
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Could be anything on the belt drive really, I know my friends N55 developed a squeak that got eventually got worse, his compressor seized and ended up shredding his belt. On my N54 it had a slight squeak before a knocking sound and it ended up being that the alternator pully bearing went bad. Could be number of things, but I wouldn't ignore it
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