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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 Wed, Dec-13-2017, 01:20:11 AM   #1
e46IX
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Default Need Help Identifying Engine Rattling Noise


I'm getting a rattling noise from my engine on acceleration, happens between 3-4k. Only happens while accelerating, can't reproduce the noise while revving at idle. Not sure what it is.. loose cam bolts? Rod knock? I stopped driving the car about a month ago. Car still cranks and runs, only code I'm getting is a cylinder 6 misfire on startup. Not sure if it's related or not. Forum input is greatly appreciated.
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Old Wed, Dec-13-2017, 01:53:18 AM   #2
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Default Re: Need Help Identifying Engine Rattling Noise

Just a guess (I am sure someone with more experience will chime in), but I am thinking that it could be the VANOS rattle or VANOS chain/tensioner related? Or the dreaded cam bolts are backing out, like you mentioned.

Have you had the VANOS "bullet-proofed" yet?

Given the RPM it is heard at, it would seem to me to be VANOS related but, I AM NOT A MECHANIC!

Sounds like this (same RPM range too): Thread where I found this video:http://www.m3forum.net/m3forum/showt...=436687&page=2



If there are no other codes, it sounds like the next step is to try to isolate where the noise is coming from in relation to the engine. Then likely it will be time to pull the Valve Cover (and likely Vanos) to see if you can get an idea of what's going on. Just a thought, someone else with more mechanical trouble-shooting experience will chime in though. Based on what I could find, I'd bet it's "Vanos Rattle" or cam bolts.

If you have not already addressed the weak points on your VANOS, now is a good time to do it with the full Beisan-Systems line up (including rattle kit). It would also be a good time to check your valves if you are over due for a valve adjustment.
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Last edited by Dr M3an M3; Wed, Dec-13-2017 at 02:33:02 AM.
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Old Wed, Dec-13-2017, 02:09:00 AM   #3
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Default Re: Need Help Identifying Engine Rattling Noise

Dear god I hope thats not cam bolts. Being able to hear so clear from video and inside cabin none the less those cam bolts have to be hanging on by a thread. Literally.


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Old Wed, Dec-13-2017, 05:11:14 AM   #4
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Default Re: Need Help Identifying Engine Rattling Noise

Sounds like vanos or rod knock. There are tests you can run for rod knock through the spark plug hole, this guys does a really great job with the explanation:

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Old Wed, Dec-13-2017, 05:33:43 AM   #5
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Default Re: Need Help Identifying Engine Rattling Noise

Quote:
Originally Posted by mrgizmo04 View Post
Sounds like vanos or rod knock. There are tests you can run for rod knock through the spark plug hole, this guys does a really great job with the explanation:

How to test for Rod Knock using a screwdriver - YouTube
Thanks for sharing. Very good explanation. I like being able to visualize what he he initially did.
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Mods: Maintenance, WPC treated rod-bearings, VinceBar (weld) + Redish Plates, Full Beisan VANOS 'lockdown', Supersprint V1 Stepped headers w/ Oversized Section 1, SS Resonated X-Pipe section 2, RE El Diablo Muffler, BBS LMs w/ PSS, Streamline CSL Bumper, CSL style CF diffuser, Vorsteiner CF CSL Bootlid, Angel-eyes, CSL SMG Engine DME tune, CSL '255' SMG DME tune, CSL Dynamic Redline Warmup Light parameters.
Active Group-Buys (PM if Interested): OE CSL Bootlids, CSL Bumper, OE CSL Wheels, Supersprint Headers/Exhaust MEGA thread, CSL Airbox, Brembo, Cams/Pistons...and more to come!
Please PM me - In search of:
-- Wanting to Trade basically brand new Eagle Eye Smoked Reverse Trunk Lights for a pair that are Non-smoked
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Discussing Avin Avant 3 Wait and Other Options 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)