[oczko98]

When the car is idle (either in Park, or in drive with the brakes engaded), there is a very subtle shake to the car. I can feel the vibrations.

The car idles at about ~ 700 rpm. (It goes from 683 to 717 and changes.. it should be like this?)

I replaced spark plugs (ngk) and engine mounts (febi), it still shakes and I really don't think this is normal.

F30 328i sport line n20

[CrimsonMoonLight72]

Idk if this is outdated info but do engines still have harmonic balancers

[rjd_F30]

Eh mine kinda shimmies very slightly as well. My old 328i did it worse than my 335i but both have a very subtle shake at idle, which would make sense as the 6 cylinder is more well-balanced than the 4 cylinder. I think it's normal. It's a 3 series after all. If you want to be totally isolated from the drivetrain vibrations, try a 7-series

[cfm56d7b]

OP, did you have a chance to scan and review any stored codes?

[gameson]

my car has the same vibration with you, and also same engine as well, so i m tracking this thread

[oczko98]

Originally Posted by rjd_F30

Eh mine kinda shimmies very slightly as well. My old 328i did it worse than my 335i but both have a very subtle shake at idle, which would make sense as the 6 cylinder is more well-balanced than the 4 cylinder. I think it's normal. It's a 3 series after all. If you want to be totally isolated from the drivetrain vibrations, try a 7-series

Hmmm… had also n20 328i before and everything was good, I mean No vibrations at all.

[oczko98]

Originally Posted by cfm56d7b

OP, did you have a chance to scan and review any stored codes?

Yeah, sure.
Need to change the battery because its weak.

I need to check ignition coils.. maybe there is a problem?

[paulymu]

Sounds like we having similar issue. I have a 2016 340 x drive, an when i would sit in the car after starting it up, it would shake a bit an the revs will dip like it wants to shut off but then it will catch itself and rise back up to idle. Sometimes it just shakes without the revs dipping but you feel it. One time it got so bad i got the dreaded dme. That was the worst its been. Took it to the dealer an they said its the vent valve. Replaced that, worked for a bit but a few months later it came rite back. Don't feel like paying another $180 to diagnose, an $120 for parts only to have it happen again.

[sspade]

Originally Posted by paulymu

Sounds like we having similar issue. I have a 2016 340 x drive, an when i would sit in the car after starting it up, it would shake a bit an the revs will dip like it wants to shut off but then it will catch itself and rise back up to idle. Sometimes it just shakes without the revs dipping but you feel it. One time it got so bad i got the dreaded dme. That was the worst its been. Took it to the dealer an they said its the vent valve. Replaced that, worked for a bit but a few months later it came rite back. Don't feel like paying another $180 to diagnose, an $120 for parts only to have it happen again.

Do you have a part number for this vent valve that was replaced?

[paulymu]

Originally Posted by sspade

Do you have a part number for this vent valve that was replaced?

https://www.turnermotorsport.com/BMW...tt=13907643106

Part number: 13907643106.

You can try get it from other stores but it costs about the same from bmw. So i'd say get it from them.

That's a vid on how to replace it. Same vid i watched to do it myself.
Hope this helps.

[aL_bmwf30]

Originally Posted by rjd_F30

Eh mine kinda shimmies very slightly as well. My old 328i did it worse than my 335i but both have a very subtle shake at idle, which would make sense as the 6 cylinder is more well-balanced than the 4 cylinder. I think it's normal. It's a 3 series after all. If you want to be totally isolated from the drivetrain vibrations, try a 7-series

Better yet buy a lexus lol my 2003 lexus runs much smoother and is silent compared to my bmw n26

[sspade]

Originally Posted by paulymu

https://www.turnermotorsport.com/BMW...tt=13907643106

Part number: 13907643106.

You can try get it from other stores but it costs about the same from bmw. So i'd say get it from them.

That's a vid on how to replace it. Same vid i watched to do it myself.
Hope this helps.

Thank you, very much!

Definitely going to dig into this now that you've laid it out for me.

[rjd_F30]

Originally Posted by aL_bmwf30

Better yet buy a lexus lol my 2003 lexus runs much smoother and is silent compared to my bmw n26

I just saw the add they ran for the LS400 back in the day on YouTube, running it to 6k rpm on a dyno with a pyramid of wine glasses on the hood and the water in them barely ripples. You're right. You want smooth buy an LS400 haha.

[paulymu]

Originally Posted by sspade

Thank you, very much!

Definitely going to dig into this now that you've laid it out for me.

Let me know how it goes as i'm thinking about just buying the part again and replacing it and seeing if that corrects the issue once and for all this time.

[dís_f30]

Check plugs, coil packs and O2 sensors

[Chris.let]

Sounds like a slight misfire. I had a misfire that wouldn't register codes. I managed to identify it with ISTA by reading the live data of the DME and picked up the exact cylinder that was misfiring. That can help you nail it down as it did for me.

[dv8ed]

Originally Posted by Chris.let

Sounds like a slight misfire. I had a misfire that wouldn't register codes. I managed to identify it with ISTA by reading the live data of the DME and picked up the exact cylinder that was misfiring. That can help you nail it down as it did for me.

with your misfire was it coil or spark plug causing issue?

[Chris.let]

Originally Posted by dv8ed

with your misfire was it coil or spark plug causing issue?

Mine was a spark plug on cyl. 3. It was a new but faulty plug, had to exchange it and I was good to go.

[oczko98]

Originally Posted by dís_f30

Check plugs, coil packs and O2 sensors

The Oxygen sensor after catalyst ~ 1.5
The Oxygen sensor before catalyst ~ 0.7
That values are normal? (Warm engine, idle)