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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 07-28-2008, 07:48 PM   #1 (permalink)
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Exclamation m42 chattering!

i noticed today that my 318is is chattering pretty bad on the passenger side. sounds like its coming from the headers or the block. it has 225k miles on it so i know there will probably be some noise... is this one normal?
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Old 07-28-2008, 08:01 PM   #2 (permalink)
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what kind of chatter?
Does it vary with Rpms?
Driving differently?

Have you replaced your timing chain tensioner? Those tend to make noise, i replaced mine at 150k. Im sure you might be due for that?
Might be the valves?
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Old 07-29-2008, 08:49 AM   #3 (permalink)
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its at low rpms and it doesnt feel like its driving differently, but ive only had it for 2 months. the tensioner was the first thing i was going to replace because of the mileage, but this sounds like its coming from under the motor. i dont think its the valves unless one of them is bent or something. besides, it sounds like its further south than the valves. would a miss cause it to chatter?
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Old 07-29-2008, 02:21 PM   #4 (permalink)
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chatter? as in your exhaust pipe maybe touching the body?
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Old 07-29-2008, 08:52 PM   #5 (permalink)
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yeah, its possible that the exhaust is touching the body... it kinda sounds like it might be. do you think it could be a bad motor mount causing it?
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Old 07-30-2008, 12:15 AM   #6 (permalink)
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...more like 1 or more of the rubber doughnuts that hold the exhaust pipe in place may have popped it's hooks or broke...
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