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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Vibration, but no CEL



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      12-05-2015, 06:36 PM   #1
chinko
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Vibration, but no CEL

I have a strong vibration coming from the front, but no CEL. Not sure if related to a worn FM flywheel, I used to have a bit vibration on the clutch pedal. Now the shaking overwhealmes it and is felt through the front cabin. Happens when clutch engage, disengaged, driving, idling.

Tried to swap coils with a used one that was causing misfire under tuned high load. Car is now stock. Could this be engine mounts? Flywheel? Or should I get a odb2 reader first?
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      12-05-2015, 09:33 PM   #2
CeeWhizzle
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Check your intake valves lately?

Post some more info like your mileage, recent maintenance, etc
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      12-05-2015, 11:43 PM   #3
chinko
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Quote:
Originally Posted by CeeWhizzle View Post
Check your intake valves lately?

Post some more info like your mileage, recent maintenance, etc
Walnut blast was done a year ago, so less than 13k miles ago. Car is approching 100k miles and recent maintenance includes OFHG and OCG (oil and coolant flush), vacuum lines replacement (only the two lines going near the Oil filter housing). I'd say the problem started after a week or so of the vacuum lines. I checked and the replacement seems to be fine. One coilpack was replaced six months ago as well.

There was a some chatter and vibration coming from probably dmfw. Spark plugs and injectors a year ago by dealer.
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      12-06-2015, 02:49 AM   #4
CeeWhizzle
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Hm, quite interesting. Is the vibration strongest on the engine? Could be motor mounts. I'd check them out considering you are starting to get into some high mileage. They aren't hard to change at least.

My only thoughts, without seeing the vehicle would be motor mounts or a missfire, but you said you aren't throwing a CEL. However, that doesn't mean you necessarily have any codes stored. Have you tried pulling each coil while engine is running to see if anything changes or not?
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      12-06-2015, 04:03 AM   #5
chinko
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Pulling coils when engine is running? Didnt do it, didnt think it was possible. What's the expected reaction?
and also how do you check if the mounts are ok?
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      12-06-2015, 03:36 PM   #6
chinko
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This is one the moment I regret selling the Cobb before the car, now I have nothing to diagnose and log the car
What's curious is the rpm doesnt fluctuates and engine still vibrates.
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      12-06-2015, 03:55 PM   #7
CeeWhizzle
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Disconnecting a coil at a time whilst the engine is running will tell you if one is back or not. If the engine behavior changes, such as it runs worse when you disconnect one, then that coil is good and/or working properly. If no change is made, then that coil is most likely the problem. However, I'd give the motor mounts a look before doing this. Check to see if they're cracked or loose. Use a pry bar underneath and give them a wiggle. You can easily tell if they have too much play or not.
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      12-06-2015, 04:42 PM   #8
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were the motor mounts loosened lately
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      12-06-2015, 06:20 PM   #9
chinko
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Nothing was done recently affecting the mounts, I'll try to read up on it to see what I can do. Sounds like something better off giving to my indy.
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