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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, Feb-12-2017, 06:41:49 PM   #1
911Fiddler
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Default Horrible engine noise

This evening, following a cold start up, car was sat idling for 10 mins whilst I did a bit of INPA, suddenly a knocking started in the engine, so I switched her off. I waited 5 mins then restarted her, noise had changed slightly but still there and horrible, arghhhhhhh!
Experience based opinions please on what it could be....
-engine has been v healthy, no knocks etc, looked after v well, lots of fresh parts.
-rod bearings done 20k miles ago, preventive refresh, crank journals were fine.
-vanos refresh last year, internal seals, but not the oil pump disk or the infamous bolts.
Right now I'm thinking it could be...
-vanos oil pump drive tab fracture.
-vanos bolt failure.
-spinning rod bearing shell. (Hoping it's not this)
Tomorrow I'll take off the top of the engine, check the vanos.
Deep misery. But at least it happened at home.



Last edited by 911Fiddler; Sun, Feb-12-2017 at 06:45:49 PM.
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Old Sun, Feb-12-2017, 07:22:31 PM   #2
lmtfi
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Default Re: Horrible engine noise

What did you do in INPA before the knock?
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Old Sun, Feb-12-2017, 07:26:23 PM   #3
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Default Re: Horrible engine noise

doesn't sound like a rod to me.. is it an SMG?
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Old Sun, Feb-12-2017, 07:29:50 PM   #4
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Default Re: Horrible engine noise

Is was re pairing the cell phone in INPA at the time it started.
Shes an SMG, 150k miles, sweet runner up to now.
Tomorrow I'll first take of the drive belts and check the ancillaries, then the cam cover...
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Old Sun, Feb-12-2017, 08:12:52 PM   #5
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Default Re: Horrible engine noise

Sorry to hear this. Gutting after doing the preventative maintenance. Hope you sort it

Last edited by schoonerm3; Mon, Feb-13-2017 at 05:45:51 PM.
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Old Mon, Feb-13-2017, 01:11:03 AM   #6
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Default Re: Horrible engine noise

Sounds like vanos cam bolts to me, same thing happened to my dads car. He drove it like that for about a month (don't do that) and nothing detrimental happened to it, I replaced them with the upgraded bolts and no problems since. I would park it and tear it down and see what it looks like under the valve cover
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Old Mon, Feb-13-2017, 01:56:39 PM   #7
911Fiddler
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Default Re: Horrible engine noise

News...
-Ancillaries, water pump etc are all ok, smooth and free.
-Vanos bolts and tabs look fine, cam lobes & chain also.
-I can see the chain tensioners and rails in place, don't seems to have moved.
-Oil is clear, no debris, likewise the oil filter as far as I can see.

So no evidence as yet, however I'm totally sure there's a problem. I still think its the rod ends, maybe as its just happened, its too early for copper debris to show up in the oil.

Anyone got any further suggestions?

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Old Mon, Feb-13-2017, 03:17:50 PM   #8
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Default Re: Horrible engine noise

Pull the oil filter. If its making that much noise, you might be able to see metal shavings in the oil filter. A rod knock is more of a clacking sound. You can also drain the oil through a fine filter/mesh to see if you have any metal bits.

Does it move and drive? Does it sound like its coming from the front of the engine?

Could be a transmission related issue. Something loose with the clutch or pressure plate.
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Old Mon, Feb-13-2017, 03:18:53 PM   #9
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Default Re: Horrible engine noise

I assume you took the drive belts off and sound was still present. If so, then drop the pan. Maybe chuncks are too large to go thru the oil pump screen . 150k no rod bearing service done?
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Old Mon, Feb-13-2017, 03:20:32 PM   #10
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Default Re: Horrible engine noise

Quote:
Originally Posted by bigjae1976 View Post
Pull the oil filter. If its making that much noise, you might be able to see metal shavings in the oil filter. A rod knock is more of a clacking sound. You can also drain the oil through a fine filter/mesh to see if you have any metal bits.

Does it move and drive? Does it sound like its coming from the front of the engine?

Could be a transmission related issue. Something loose with the clutch or pressure plate.
This also. A member had a horrible noise that turned out to be a broken pressure plate.. it was an smg.. thats why i asked. But as mentioned drain the oil and see what u find.
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Discussing Horrible engine noise 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)