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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 07-20-2017, 05:28 PM   #21
M397
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Join Date: Jan 2017
Location: Dallas
Posts: 16
My Ride: M3 e46/e36
Quote:
Originally Posted by mooninite View Post
I would hesitate to think it is the harmonic balancer. You have a stock car and have not tracked it (I'm guessing). It should last the life of the car (200k+ miles).
Yes the car is all stocked and not tracked.
what I didn't mention early is maybe about 3 months ago I made a post here. AboutI bought the car from a guy who hit a curb and had damage to the front left suspension. I replaced all parts needed to include the wheel.
I noticed this problem recently. my spidy senses tell me since the guy hit a carb maybe something went out of balance (that's my guess)
How can I check the motor mounts
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Old 07-21-2017, 05:06 AM   #22
jermankarz
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Join Date: Jul 2017
Location: Atlanta
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My Ride: 2005 M3
M397,
There is No Check Engine Light; which would rule out a computer controlled issue like an Ignition Mis-Fire or a dead Fuel Injector. These cars are pretty good about picking up on stuff like that anyways, especially since it is consistent.

It also Vibrates in Neutral and in Park; That would rule out a speed related, suspension and drive-line related issues.

Since it does it at certain RPM's, I would think it is a balance issue. I think you were headed in the right direction with the Harmonic Balancer but agree with Mooninite, and would say that is not very likely.

BUT, Lets consider the other side of the engine and what is likely... the Flywheel.

The Dual Mass Flywheel is probably at the begining stages of failure. It is also a common issue with these cars. You should be able to find a great deal of info on that subject on this forum.
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Old Yesterday, 12:20 AM   #23
M397
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Join Date: Jan 2017
Location: Dallas
Posts: 16
My Ride: M3 e46/e36
Quote:
Originally Posted by jermankarz View Post
M397,
There is No Check Engine Light; which would rule out a computer controlled issue like an Ignition Mis-Fire or a dead Fuel Injector. These cars are pretty good about picking up on stuff like that anyways, especially since it is consistent.

It also Vibrates in Neutral and in Park; That would rule out a speed related, suspension and drive-line related issues.

Since it does it at certain RPM's, I would think it is a balance issue. I think you were headed in the right direction with the Harmonic Balancer but agree with Mooninite, and would say that is not very likely.

BUT, Lets consider the other side of the engine and what is likely... the Flywheel.

The Dual Mass Flywheel is probably at the begining stages of failure. It is also a common issue with these cars. You should be able to find a great deal of info on that subject on this forum.
Jermankarz,
Thank you for your input. If is the fly wheel what are some some symptoms to look for for? I also hear a lot of enthusiasts say to check motor mounts. What is The best want to check if mounts are bad.
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