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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Nov-11-2019, 08:51:01 PM   #31
Whitehawk8
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Default Re: Random Engine Knock When Sitting Still

My car did this for 2 days randomly. I can't remember if this was specifically it but I changed the knock sensors around this time. Maybe that would do it?

You need a special scan tool to check those. Or get BMW logger on your laptop
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Old Tue, Nov-12-2019, 02:41:39 PM   #32
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Default Re: Random Engine Knock When Sitting Still

fly wheel chatter
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Old Thu, Nov-14-2019, 02:53:30 AM   #33
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Default Re: Random Engine Knock When Sitting Still

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Originally Posted by evanr614 View Post
Look at you still lurking! Haha when you say hiccup would say it felt like a small “thud”? Also no RPM fluctuation?

“skip a beat” is probably the best way to describe it!
It would fluctuate the RPM down momentarily. "Skip a beat" is also a good description of it. Car did this before and after coils were replaced, and only at idle.

Of course I'm still lurking! Especially now that I know you're posting on here.
I'll be tracking your progress with the car with great interest, so please post up pics as you go.
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Old Sun, Nov-17-2019, 04:12:26 AM   #34
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Default Re: Random Engine Knock When Sitting Still

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Originally Posted by Kdubski View Post
fly wheel chatter
I'm thinking this, too. I've had the same issue, but noticed it went away when the clutch was depressed.
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Old Sun, Nov-17-2019, 04:30:57 PM   #35
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Default Re: Random Engine Knock When Sitting Still

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Could it be felt throughout the car?


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The sound was very audible inside the cabin but not felt inside. On the engine itself you can feel the light tapping.
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Discussing Random Engine Knock When Sitting Still in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)