E60 m5 rattle noise at certain rpm when engine under load - BMW M5 Forum and M6 Forums
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post #1 of 23 Old 7th May 2015, 03:14 AM Thread Starter
Hg1245
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E60 m5 rattle noise at certain rpm when engine under load

I have noticed that when I put the engine under load, either light or heavy load, there is a rattling noise that seems like it comes from the front of the car. It doesn't sound like the rod bearings. It is a light rattling that sounds like something is loose. Has anyone heard anything like this? Your advise is much appreciated.
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post #2 of 23 Old 7th May 2015, 03:15 AM Thread Starter
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I should note that the noise is non existent when reving the engine while the car is parked.
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post #3 of 23 Old 7th May 2015, 05:28 AM
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Could be air in the Vanos. I was getting a slight metallic sounding rattle at 3000 to 4000 rpm. Bled the VANOS and rattle gone. I also have two bad solenoids which are not helping much.
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post #4 of 23 Old 7th May 2015, 02:18 PM Thread Starter
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post #5 of 23 Old 7th May 2015, 02:30 PM
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It could be detonating slightly. Our cars have a VERY high compression ratio for a non direct injected motor. The computer will pull timing if you stay in the throttle and the noise will go away. I believe this is happening to cars with higher miles that may be getting some carbon build up in the combustion chamber. This seems to be fairly common on the modern high performance engines like the Audi RS V8's.

You should put in some 100 octane unleaded fuel and see if the noise goes away.

My car has been doing it (wives daily driver) for a little while. I took the car for a few days and ran it very hard (trying to burn off some of the potential deposits) and it appears to be better.

Later, Steve

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post #6 of 23 Old 19th August 2015, 11:49 AM Thread Starter
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I have come to the conclusion that the noise is caused by four bad vanos solenoids. I ran a test and it came back all were out of tolerance. I think it makes sense because the solenoids aren't able to advance/retard the timing like they should. I believe the noise is from the actuating units on the heads.
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post #7 of 23 Old 19th August 2015, 12:29 PM
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You should validate that with the experiences of other board members that had their solenoids out of spec. I feels like a stretch to me, but who knows.
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post #8 of 23 Old 19th August 2015, 06:37 PM
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Quote:
Originally Posted by Hg1245 View Post
I have come to the conclusion that the noise is caused by four bad vanos solenoids. I ran a test and it came back all were out of tolerance. I think it makes sense because the solenoids aren't able to advance/retard the timing like they should. I believe the noise is from the actuating units on the heads.
How do you test the solenoids? I also have a rattle under load that sounds like I didnt tighten my aftermarket pedals (metal on metal vibration/buzzing).

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post #9 of 23 Old 19th August 2015, 07:04 PM Thread Starter
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You do it through software, I tested mine through DIS and performed the vanos ventilation about five times. Still making noise. If the noise you're describing only occurs at certain rpm and with the engine under load, chances are you have the same problem.
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post #10 of 23 Old 19th August 2015, 07:49 PM
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Sounds hard to believe all four solenoids would be bad.

2006 M5 Sapphire Black Metalic, completely stock for now
2001 M3 Red/Blk 6sp, exhaust, coil-overs, and wheels, 19x9.5" with 275/30R19's front and rear
2006 911TT Black/blk 6sp EVOMS GT610 pkg (525whp & 510wtq)
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