Vibration when I accelerate

Greg · #1 05-11-2010, 01:33 AM

Ok Guys. I have a 2001 4.4 with 95K miles. Recently I noticed when I accelerate I get a vibration under my feet. I am assuming it's probably a exhaust leak. Anyone have any suggestions?

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x52003 · #2 05-11-2010, 04:01 AM

this because of the cylinders coyals not the cylinder it self

it will be one of the koyals damage

but to check it you have to know it by computer programing.

that all

don't let any body sheet you

jst2878 · #3 05-11-2010, 09:02 AM

Front suspension components is crapped. Have an experienced BMW mechanic isolate the problem

Weasel · #4 05-11-2010, 01:11 PM

If it is a misfire caused by coils then the check engine light would be on, and flashing during the active misfire. If it is the front suspension you should also feel it at other times, possibly under braking as well. I've even seen this problem from a broken motor mount. Basically, need someone experienced to diagnose as it could be one of many things and you don't want to guess by throwing parts at it... that costs more than proper diagnosis most of the time.

Greg · #5 05-11-2010, 02:51 PM

It's not the suspension. Had the entire front suspension replaced, very smooth ride. The SES light is on, but that's because of a Leak in the EVAP Emission Control System working on that also. This vibration is coming right under the accelerator pedal. I thought it might be a exhaust leak.

jst2878 · #6 05-11-2010, 03:02 PM

Def take weasels advice, he is a guru of e53s. And if it's not the motormount make sure to check the flex disc on the front driveshaft.

prwdmd · #7 05-12-2010, 09:41 AM

I've had a vibration on acceleration. Take a look at my thread from a few months ago. Flex disc was my main suspicion, but it turned out to be a bad half axle. This was diagnosed by the dealer. Completely took care of the issue.

A vacuum leak will give you a rough idle or vibration while stopped at a light for example, but it wouldn't be noticeable enough to shake the whole car while in the highway. That is more indicative of a drivetrain issue.

Greg · #8 05-12-2010, 01:48 PM

I'll check the motor mount. I've had both front axles replaced along with everything else that has to do with the front suspension. I'll post after I have it checked. Thanks

sjane · #9 12-19-2010, 07:15 PM

Did you find the issue? Flex disc? Engine mount? I have a slight vibration ~2000 when accelerating, nothing at high RPM or low RPM. Feels like exhaust touching body but I know this is not the case.

Greg · #10 12-19-2010, 07:26 PM

Still have the issue with vibration when I accelerate from a stop. It also does it when I punch it to pass. Don't know where the flex disc is located. Can anyone give me some help as to where it is? I did have it in the garage and had a buddy push on the accelerator and i put my hand on the engine and didn't feel any noticeable vibration.

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