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03-23-2023, 04:40 PM | #1 |
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Ticking sound on cold start - with video
Hello
I've just bought my first M3 V8, which runs very well However, on cold start, until the revs drop, it has a ticking sound, mainly from underneath or back of engine. The ticking stops about 5 seconds before the revs drop from 1,000rpm to 750rpm. It does not tick at any other point, and not in the 1600-2000 'dreaded bearing rev range' It's done 52k mile, had the actuators done, and on the original bearings I've taken it to a dealer who said it was normal and just the hydraulic valves filling with oil, which I don't believe, because the ticking continues until the cold start high revs drop Any ideas whether this is an issue or normal and if anyone has had the same issue and resolved it Its filled with TWS 10w60 oil less than 1,000 miles ago Here's a Youtube link to a short video, demonstrating the ticking when at 1k rpm and then at 750rpm thanks
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03-24-2023, 02:24 AM | #3 |
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thanks - just the confirmation I needed from another owner
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03-24-2023, 11:00 AM | #5 | |
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Cold Engine Startup Routine
Quote:
You can verify this on a cold engine start with data. And if you are able to graph it--that'd be pretty neat. You'll also notice that if you idle for too long, the DME will actually raise the idle from 550 rpms to like 700ish. I bet this is when the cats start to cool down and/or the O2 readings It's kinda interesting to me. I'm trying to search TIS on this...didn't find too specific of information, but there is a target "Diagnosis value" of the O2 sensors the DME targets.
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03-24-2023, 12:30 PM | #6 |
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Thanks for the replies and confirmation from three other M3 owners
I hope this thread can put the mind of any other new M3 owners in the future at ease
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