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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 04-03-2005, 09:53 PM   #1 (permalink)
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my 93 318is makes a kind of a rattle type sound at certain throttle positions. i took a look underneith and there is black where the exaust is bolted together in the middle, so im thinking it is that joint. any thoughts, or suggestion on how to fix this?

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Old 04-03-2005, 10:07 PM   #2 (permalink)
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I had a rattle that I thought was an exhaust or heat shield rattle for the longest time, and went crazy looking for it. It turned out to be that the plate behind my right front brake rotor was cracked, causing a loud rattling noise during certain driving situations. I ended up just cutting an bending a little piece of the plate, and that stopped the rattle.

If you cant find the rattle in the exhaust system you should definatly check there.
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Old 04-03-2005, 10:21 PM   #3 (permalink)
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Quote:
Originally posted by red325ix@Apr 3 2005, 09:07 PM
I had a rattle that I thought was an exhaust or heat shield rattle for the longest time, and went crazy looking for it. It turned out to be that the plate behind my right front brake rotor was cracked, causing a loud rattling noise during certain driving situations. I ended up just cutting an bending a little piece of the plate, and that stopped the rattle.

If you cant find the rattle in the exhaust system you should definatly check there.
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thanks for the response, but this noise is coming more from the back and i just did a brake job/inspection and didnt notice anything like that. ill check again in case though...

reason i think its exhaust is because of the black soot on that joint as well as on the pipe after the joint. just dont know what to do to fix it used
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Old 04-04-2005, 12:34 PM   #4 (permalink)
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you need to put new gaskets where the downpipe and the cat meet... also look for any leaks in it, meaning like any holes that might make that sound...
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Old 04-04-2005, 07:00 PM   #5 (permalink)
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i did find one hole just before the muffler which i thought was gunna be the cause of the noise, but i patched it up and it still does it. you say where the downpipe and cat meet? the part i was refering to was between the two cats... is there supposed to be a gasket there too?
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Old 04-05-2005, 12:53 AM   #6 (permalink)
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anyone?

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Old 04-05-2005, 11:11 AM   #7 (permalink)
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It could be the heat shields - and the gaskets are bad. If that's the case (I'm getting this done next monday) you could get the shields welded to the exhaust or have some metal shims hammered in - those shields need to stay there, so it's not like you'll be removing them any time soon.
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Old 04-05-2005, 02:49 PM   #8 (permalink)
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I did have a rattle too and I've fixed it by removing the o2 sensor cap. It's where the 2 pipes come together where the first (or only) o2 sensor is fitted.
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Old 04-05-2005, 03:37 PM   #9 (permalink)
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That's right after the cat convertor, right dutch? Is your cat. okay?
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Old 04-05-2005, 11:49 PM   #10 (permalink)
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cool, ill check this stuff out first chance i get

thanks
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Old 04-06-2005, 12:19 PM   #11 (permalink)
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SD let me know if that was your problem... if it's just in your exhaust then it's not a big of a deal... but i'm pretty positive it's the pipe underneath that makes the noise...
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