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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 09-13-2010, 10:50 PM   #1 (permalink)
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Bad engine noise

I have a 97 318i 4 cyl 118k was running great for years drove about 8 miles to store no issues.. Got back in car 30 minutes later and cranked it up, sounds like a bad bearing squeal or grinding sound ,when rev. Engine sounds it's higher pitched.. Took both belts off and cranked up with no change help!!!!!
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Old 09-13-2010, 10:57 PM   #2 (permalink)
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Possibly one of the accessory bearings is bad and getting worse fast IMO. Best of luck.
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Old 09-13-2010, 11:08 PM   #3 (permalink)
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thank you for your reply witeshark i was thinking with the belts off would eliminate accesory bearings?
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Old 09-13-2010, 11:17 PM   #4 (permalink)
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Well, yeah, but that event, the bearing issue may be a more critical one... eg water pump.
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Old 09-13-2010, 11:24 PM   #5 (permalink)
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does the water pump turn with out a belt? may be a stupid question...i don't know...
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Old 09-13-2010, 11:30 PM   #6 (permalink)
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AFAIK it is not; it's far too important. It's typically associated with the drive to the cam, so engine timing based.
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Old 09-13-2010, 11:40 PM   #7 (permalink)
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thank you for the input ... I was leaning toward a timing issue , the only thing is the engine still runs great no skips or backfire .
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Old 09-14-2010, 12:04 AM   #8 (permalink)
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Yeah, well that doesn't rule out a bearing issue on a timing based component like the coolant pump. Wishing you luck!
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Old 09-14-2010, 08:20 AM   #9 (permalink)
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thank you witeshark any body else had this issue?
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Old 09-19-2010, 03:27 PM   #10 (permalink)
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Water pump is belt driven so removing the belts will eliminate any water pump noise. Only other thing, is it possible that the starter is remaining engaged.
When that happens, it makes a lot of extra noise and it would be higher pitched as well.
Other than that, there is your throw out bearing if you have a standard. Push lightly on the clutch to see if pitch changes.
Timing chain issues like guides etc I don't think would make a high pitched sound. Also if something skipped a cog, the engine would run differently.
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