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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 Sun, Sep-03-2017, 07:20:50 PM   #1
tomj87
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Default knocking noise after cold start

Hi guys,
my M3 has a knocking noise right after a cold start. It only appears on cold starts and you can only hear it for 1-2 seconds.

Video:

Top end (Vanos, sparks, chain guide,...) of the motor got completely rebuild by Kevin (thanks at this point, he did a great and fast job!)
Valves are adjusted
Oil is fresh (ori. BMW 10W60)
Memory is empty (read it with INPA)


Does anyone has an idea where this noise could come from? My best guess would be that the oil pump can't build up the oil pressure fast enough.


Thanks,
Tom
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Old Sun, Sep-03-2017, 07:53:51 PM   #2
Arehman
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Default Re: knocking noise after cold start

My buddies M3 does the same exact thing. I had a M3 in the past that did this as well. Vanos and everything had been done too.
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Last edited by Arehman; Sun, Sep-03-2017 at 10:14:13 PM.
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Old Sun, Sep-03-2017, 09:20:38 PM   #3
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Default Re: knocking noise after cold start

My M3 does the same thing on colder mornings. Vanos and rod bearings have been done in the past 3k miles.
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Old Sun, Sep-03-2017, 10:14:32 PM   #4
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Default Re: knocking noise after cold start

Also feel like its oil pump related. Who knows..
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Old Sun, Sep-03-2017, 10:51:38 PM   #5
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Default Re: knocking noise after cold start

Mine does it too, can't figure it out.
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Old Mon, Sep-04-2017, 02:36:25 AM   #6
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Default Re: knocking noise after cold start

There are a lot of post with no definitive answers. The m62 v8 does it as well. Some have had apparent success with replacing the chain tensioner. It does sound like the chain slapping the valve cover.
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Old Mon, Sep-04-2017, 03:12:59 AM   #7
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Default Re: knocking noise after cold start

Mine does it on occasion, a little quieter but the same sound. Vanos & Rod Bearings have been addressed.
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Old Mon, Sep-04-2017, 03:25:00 AM   #8
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Default Re: knocking noise after cold start

My 2I would say the Oil filter housing valve(not sure exactly the name)
It leaks over night, and returns oil down to the pan.
Its like every morning you start the car, you have replaced the oil filter and the housing is empty of oil....
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Old Tue, Sep-05-2017, 02:29:45 AM   #9
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Default Re: knocking noise after cold start

If I had a noise like that I'd get an oil pressure gauge set up to see what was going on. Do any of you have oil light stay on more than a half second after engine first fires?

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Old Tue, Sep-05-2017, 04:29:31 AM   #10
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Default Re: knocking noise after cold start

Similar thing here
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Discussing knocking noise after cold start 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)