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11-11-2019, 10:27 AM | #1 |
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2011 135i knock sound
Noticed this the other day while in a drive through. Car has a weird knock sound when I rev it just a tiny bit. I don't think it's a huge issue, but I have no idea what it could be. Anyone got any ideas?
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11-12-2019, 02:27 PM | #3 |
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I can't hear much through my crappy laptop speakers. Some questions that the answers for might help others help you:
Does it change when you are driving / under load With engine speed (assume this is yes) Have you lifted the hood and listened around to isolate it to front / back / left / right Does it sound like metal, plastic Have you ever heard fuel injector noise or actual rod knock to compare to |
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11-12-2019, 07:25 PM | #4 |
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For under $10, get a mechanics stethascope, and have a friend rev the engine while you place the scope on various places around the engine bay (except anything rotating). Be careful, but it should help isolate where the noise is coming from. It could be many things. If it's coming from the lower half of the engine, it's probably more serious.
Let us know what you find out. |
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11-13-2019, 07:54 AM | #5 |
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It sounds turbo or pressure system related since it clicks right at the end of your rev, when you would expect the boost pressure to release.
Do you still have your exhaust flap connected on your exhaust? Kinda reminds me of that maybe closing at the end of your rev |
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11-13-2019, 03:32 PM | #6 | ||
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Quote:
Quote:
Someone commented on the YouTube video that it could be the exhaust banging against something or a bad engine mount/exhaust hanger. |
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11-13-2019, 03:46 PM | #7 | |
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Quote:
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12-11-2019, 02:03 PM | #8 |
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Just now getting the car back from the dealer. Noise is coming from inside my downpipe. Have the AR design catless so looks like I'll be dropping the mid section to see what's going on 🤷🏻*♂️ I'll keep this updated.
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