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BMW 3-Series (E90 E92) Forum
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Knocking sound
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01-28-2013, 03:57 PM | #1 |
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Knocking sound
Ever since its been very cold, I get a weird noise when I start the car in the morning. When it is cold, I get a knocking sound on the driver side of the engine, below the intake manifold. This only happen when the car is cold, and the idle is sitting at 600 rpm. As I rev the engine a little bit the sound goes away and when the idle settle. The sound comes back, until the car warms up to normal temperature. The sound is like a rod is knocking, I have no codes, or any cel. Anyone else have this issue? I did some search, and did not find a clear answer. The car drives perfect with no issues. Any help would be great, thanks!
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01-28-2013, 05:53 PM | #2 |
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01-29-2013, 12:03 AM | #3 |
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Lifter tick. Although its more common on the N52, it does happen on N54 engines. Removing the camshafts and replacing the lifters is the fix. If you were more local I could help you out better.
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01-29-2013, 12:49 AM | #4 |
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Would this be covered under CPO warranty? I will go talk to the dealer. I had a similar sound before, and it turned out to be a loose TQ converter bolt. It was not torque down right. I wonder if it is the same thing, but I will mention the lifter issue to them.
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01-29-2013, 09:57 PM | #5 |
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I have the same thing. The ticking of the injectors and the knock of an unknown cause. I brought it into the dealer and they said it was the purge valve, and was considered normal however I think it's worse. It's already there for them to hear on a cold start, ill return with my results.
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01-29-2013, 10:02 PM | #6 |
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http://www.youtube.com/watch?v=kZF7t6bcysQ
same exact sound as my motor.
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01-29-2013, 10:25 PM | #7 |
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My car ticks when the engine is still cold. Goes away pretty quick when it's warm. It's almost non-existent in the summer. Had the same noise on two N54s.
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01-29-2013, 10:35 PM | #8 | |
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Quote:
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01-30-2013, 12:22 AM | #9 | |
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01-30-2013, 12:05 PM | #10 |
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Any word yet? My SA hasn't gotten back to me.
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01-30-2013, 02:09 PM | #11 |
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I have an appointment on the 11th, that is the soonest they can get me in. One thing I noticed was, it is warm outside today and the knocking did not last as long as it would before. I had this similar knock sound in the past, and it turned out to be a loose torque converter bolt. They torqued it down correctly and the knocking sound went away. However when it got really cold out, the knocking came back.
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01-30-2013, 04:03 PM | #12 | |
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01-30-2013, 06:00 PM | #13 |
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After coming home from work this morning, I left my car outside (always garaged when home). After letting it sit outside for 5-6hours, I started it and let the idle settle at 600 rpm and the knock sound showed up. By the time i finished saying WTF the sound went away. The knock sound was there for maybe 3 seconds. After that she sounded perfect. I am starting to think, the sound is due to very cold weather. Today it was 70* so I am thinking in warm weather the knock sound will go away. This knock started when the temperature went below 40 degrees here.
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