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Hey all, so recently I've been having a weird noise come from the bottom of my lovely BMW. It's a loud brrrt and vibration. The car drives completely fine and only happens when I'm driving for awhile and then I come to a stop. It stops after I hit the gas. I have a check engine light, but no other issue lights so I feel as if it rules out ABS. Anyone know what could be going on? Thanks.
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What is your CEL for? It would be most helpful if you can specify the code, and also upload a video of the sound to YouTube or some similar service.
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https://youtu.be/q1JI8e_FIXE here is the video of the soundOriginally Posted by hbrandon1987
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When it starts making the sound, pop your hood and have a look at the belts and pulleys, see if you have anything abnormal going on there. I had a similar strange sound, which went away after replacing the water pump. Not saying your issue is the water pump.
Does it happen at all on cold startup?
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Also you didn't mention why your check engine light is on?
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It's never on cold start up. It's only happening after I drive for a little and then come to a stop. At idle in gear is when the noise happens the most.
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The engine codes are as follow: P0313- The PCM has determined a misfire has occurred with low fuel. P0430- Catalyst efficiency bank 2, probable cause rich air/fuel ratio or high fuel pressure. P2098 Catalyst fuel trim system too lean on bank 2, probable cause vaccuum leak on engine, MAD sensor fault, air leak near sensor or bad sensor.
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Sorry for the delay. Sounds like generic codes. I'd find someone nearby with a BMW specific scanner and that will narrow it down more.
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Viewed your YouTube video for the weird sound. I never encountered such sound in my 330Ci. It sounds like the one or more belt is slipping. Can you remove the belts (it is easy) and inspect them for oil?
The steering pump hose is known to leak for BMW, and it could drip on the belts, if you ignore it. This is my guess
For the rest of the error, I think it will be upper/lower intake boot, and vacuum hoses. Replace all of them if you haven't done so
Apprentice w/#yrs. exp.
How long has the vehicle been driven with the CEL displayed along with the codes?
The noise does sound like an exhaust component, maybe failed cat converter.
Clear codes and scan with BMW specific scan tool for more reliable clue.
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How about worn rear differential bushings...or worn transmission mounts..engine too!
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