[Roy46]

Hi everybody,

Since I have the M6, there is a vibration in the range from 1.000 to 3.000 rpm, at 1.400 rpm it is the worst. I have already balanced my wheels for two times, but found out that the vibration is also coming in when the car is standing still in Neutral. We have checked the exhaust and the engine mounting but it doesn’t look that it has to do anything with it. It is very annoying when you are driving, because every time you pull of at the traffic light and come to a stop again, the car is vibrating, which you can feel in the seat and the steering wheel. Does anybody recognize this or know what to do?<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com<img src=" /><o></o>

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[USAF]

The engine is firing on all cylinders & running perfect correct? If so, then something within the transmission/flywheel/clutch is out of balance. I'm not familiar with the M6 drivetrain construction to know how these areas are balanced. Man trans or SMG? If you have one cylinder not firing it could create this vibration but a check engine light should come on if you have one cylinder not firing consistently.

 

[Hasan Shaikh]

It seems like your carbon filter needs to be changed.

It looks like black box right next to your fuel tank. It is there to prevent vapours and fumes from the fuel tank.

 

[USAF]

The carbon filters are "downstream" from the air filter and will not be "dirty" and require changing. That shouldn't create a vibration and if it was something like that a check engine light should be triggered. How many KM are on the car? If the engine seems to be running perfect it must be something that balances the drivetrain.

 

[Hasan Shaikh]

The carbon filters are "downstream" from the air filter and will not be "dirty" and require changing. That shouldn't create a vibration and if it was something like that a check engine light should be triggered. How many KM are on the car? If the engine seems to be running perfect it must be something that balances the drivetrain.

Actually, the car has 2 carbon filters.

One is in the intake system in the air box, which is only there in the US Spec cars. Most people remove this to improve the air flow.

The second one is next to the fuel tank to minimise fuel vapour and fumes.

I am pretty sure its the second carbon filter thats causing the problem.

 

[USAF]

I assume the one by the fuel tank prevents fumes from escaping into the atmosphere from the tank? It may also allow air to replace the fuel in the tank as the fuel is drawn down. I couldn't imagine that filter becoming dirty enough to prevent fuel to be sent from the tank to the engine at only 1400 RPM. In dusty conditions like you have Hasan but probably not in the Netherlands. The key is for Roy46 to let us know if the engine seems to be firing consistently. That would eliminate the vibration being attributed to the engine fuel/air/ignition delivery. With these high-tech engines it could be so many things. I base my guesses on my experience building engines that are much lower tech such as Chevy small & big block engines.

 

[Hasan Shaikh]

Thats makes sense.

 

[Roy46]

Hi Guys, thanks for your response. The car has got a SMG transmission and the mileage is 37.000 km (22.990 miles). I don't know if I am missing power because it is from the beginning that I own the car (approx. 7 months now). Although from the beginning I think the car is slow, but that could be my imagination because my previous car was a lightweight M3 CSL. I heard people say that the VANOS could be not on time. But I think if that's the problem, it will throw an error code...

 

[Hasan Shaikh]

Hi Roy

I believe that you should get the car checked at the dealer and ask them to check the carbon filter next to the fuel tank. It us not expensive and more often than not is the cause of engine vibration at low RPMs.

I would not start with the Vanos. The timing of the Vanos is controlled mechanically by the camshaft. So that cannot be the case.

Let us know what you find out at the dealer.

 

[Roy46]

My car went to the dealer but without any result. The software from all the computers in the car are updated and the clutch is calibrated (because I still have the well known 'big bang problem' in the transmission (http://www.m5board.com/vbulletin/e6...m/167817-smg-transmission-gives-big-bang.html) Although the car is shifting smoother now, the vibration is still there.

Am I the only one with a vibration like this, or are some of you experiencing the same problem?

 

[Hasan Shaikh]

Roy my friend.

Ask them to replace the carbon filter for the fuel tank and see if it cures the desease. I am quite sure it will.

 

[myj1991728]

I also have a M6 and recently meet exactly the same vibration problem as you have before. So i'm just wondering have you find where it comes from or have you fixed it? Cause i have done many check and they all told me it's fine. Looking forward for your replying and Appreciate.

 

[Johnky90]

how much of, or what level of vibration are we talking about?
is it hard enough to shake small items on compartments?
or do you feel it only when you try to?

I get small amount of vibration but in my case it's the exhaust,
when I close my valves, and when it becomes quiet, the vibration disappears.
Do you have aftermarket exhausts?

 

[myj1991728]

it's vibration between 1000 and 3000 rpm. After that interval, the vibration disappears, especial at 1500 rpm. can easily be felt in the car and have some noise when vibrating. What do u think might be the problem?

 

[BossM6]

it's vibration between 1000 and 3000 rpm. After that interval, the vibration disappears, especial at 1500 rpm. can easily be felt in the car and have some noise when vibrating. What do u think might be the problem?

Roy my friend.

Ask them to replace the carbon filter for the fuel tank and see if it cures the desease. I am quite sure it will.

Did you try this?

 

[myj1991728]

Not yet. I'm not sure will that work?

 

[DelrayM6]

I noticed vibrations coming from my interior but only around 7-8K RPM's. I figured out it was being caused from my phone in the cup holder lol.

 

[IM6]

Fuel Filter cannot be replaced independantly as its part of the whole unit whioch is not cheap but not very expensive. I dont think that will cure the vibration. I bet it is to do with the exhaust, check how much clearence you have between the back box and the body.

Mine drones cos i have cats taken out, xpipe etc, so i do get a slight vibration through various rpms. If its cyclic then its your 02 sensors.

 

[Johnky90]

It may be that you feel the vibration further more due to the sound effect (when things are shaking)
both my M6 and my friend's previous M6 had problems with rear view mirror cover shaking and cruise control buttons shaking.
Perhaps you can try holding them whilst going through the particular vibrating rpm you mentioned about.

worth checking, won't cost ya anything
let us know how it goes on