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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 12-20-2004, 01:11 PM   #1 (permalink)
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does anyone know what this rattling sound is coming from underneath my car? i've noticed that its gotten alot louder as if there was pebbles inside my exhaust pipe rattling like crazy.

Also, when i drive it seem that my rpm maxes out at 4 1/2 and it seems like my engine is straining..... any ideas what this might be? used
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Old 12-20-2004, 01:45 PM   #2 (permalink)
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yo man, my moms e46 had the same problem. turns out it was her catalytic converter. something inside was loose or worn out or something...not exactly sure, but it was the catalytic converter.

ps don't go to the dealership to have fixed. her fix costed 1700 but luckily it was under warranty. good luck. N
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Old 12-20-2004, 04:04 PM   #3 (permalink)
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A heat shield can be rattling to the exhaust pipe.
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Old 12-20-2004, 04:21 PM   #4 (permalink)
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Crawl up underneath it and check for a loose heat sheild. If you don't see that then hit the cats with a hammer and see listen if it rattles.
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Old 12-20-2004, 04:26 PM   #5 (permalink)
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someone could have put marbles in your engine.. I've seen it before :P
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Old 12-20-2004, 05:24 PM   #6 (permalink)
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i had a bunch of rocks etc in my exhuat on my other bimmer, dont know how they do in there... someone must have put them there.. i agree just get under the car and listen

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Old 12-20-2004, 06:15 PM   #7 (permalink)
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make sure everything under your car is tightened down.
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Old 12-20-2004, 11:36 PM   #8 (permalink)
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roger that! i will check underneath my car asap. thanks guys!
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Old 12-21-2004, 10:21 PM   #9 (permalink)
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I think its deffintly the heat shield i had the same problem and i totaly got rid of mine and viola!!
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Old 12-21-2004, 10:41 PM   #10 (permalink)
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ok so:
-heat shield
-catalyc converter
-rocks in muffler from kids or assholes or whoever.



ugh. thats pritty much the whole damn exhaust system :P (I've got the rattle too, Only at idle when it's in gear, occasionally at idle out of gear, so it's a resonnant rattle for me)
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