Engine/drive train vibration under light acceleration

Turboedv6 · 08-07-2019, 05:47 PM

Hello, I just purchased a 2008 328xi auto for a daily driver. Ever since I bought it it felt like the car was misfiring under light acceleration between 1500-2500 rpm. No fault codes stored and I just installed 6 brand new OEM plugs and coils and the "misfire" sensation is still there. I've searched for anything relative but nothing really came up. Any ideas?

NinetyEight740 · 08-07-2019, 10:41 PM

How are the motor mounts? Collapsed? Many people overlook them but they have a lot to do with the isolation of motor from chassis.

Turboedv6 · 08-08-2019, 05:30 PM

I would think collapsed motor mounts would cause the vibration all the time, this is sort of an intermittent shudder almost.

NinetyEight740 · 08-08-2019, 08:21 PM

Quote:

Originally Posted by Turboedv6

I would think collapsed motor mounts would cause the vibration all the time, this is sort of an intermittent shudder almost.

Not neccesarily, as engine speed increases the engine as a whole will smoothe itself out. But that’s neither here nor there. Take a look and see if they are collapsed .

Turboedv6 · 08-08-2019, 08:25 PM

I’ll check them out tomorrow, I was almost leaning on something towards the converter/clutch packs shuddering.

nsjames · 08-09-2019, 10:29 AM

conrter shudder is a known issue on the 6l45 when the fluid is old and sucks.

new fluid goes a long way towards fizing it.

what you really need to do is get yourself a cable and the bmw tools setup so you can access the cylinder rough running diag and see which cylinder pegs the knock sensor. if they're all even, it's probably not the enging causing it.

also, ESS things sometimes cause rough running.

08-07-2019, 05:47 PM	#1
Turboedv6 Private First Class 10 Rep 176 Posts Drives: '13 Apline White Sportline 328 Join Date: Jan 2013 Location: Boston, MA iTrader: (0)	Engine/drive train vibration under light acceleration Hello, I just purchased a 2008 328xi auto for a daily driver. Ever since I bought it it felt like the car was misfiring under light acceleration between 1500-2500 rpm. No fault codes stored and I just installed 6 brand new OEM plugs and coils and the "misfire" sensation is still there. I've searched for anything relative but nothing really came up. Any ideas? __________________ 2019 Ibis White/Red S4 1997 Nissan Skyline GTR V-SPEC
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08-07-2019, 10:41 PM	#2
NinetyEight740 Major General 231 Rep 5,691 Posts Drives: 2 - 2013 535i msport Join Date: Nov 2008 Location: Orange County California iTrader: (2) Garage List 2010 E91 [0.00]	How are the motor mounts? Collapsed? Many people overlook them but they have a lot to do with the isolation of motor from chassis.
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08-08-2019, 05:30 PM	#3
Turboedv6 Private First Class 10 Rep 176 Posts Drives: '13 Apline White Sportline 328 Join Date: Jan 2013 Location: Boston, MA iTrader: (0)	I would think collapsed motor mounts would cause the vibration all the time, this is sort of an intermittent shudder almost. __________________ 2019 Ibis White/Red S4 1997 Nissan Skyline GTR V-SPEC
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08-08-2019, 08:25 PM	#5
Turboedv6 Private First Class 10 Rep 176 Posts Drives: '13 Apline White Sportline 328 Join Date: Jan 2013 Location: Boston, MA iTrader: (0)	I’ll check them out tomorrow, I was almost leaning on something towards the converter/clutch packs shuddering.
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08-09-2019, 10:29 AM	#6
nsjames Brigadier General 2442 Rep 4,330 Posts Drives: 08 328xi Touring Join Date: May 2017 Location: ohio iTrader: (0)	conrter shudder is a known issue on the 6l45 when the fluid is old and sucks. new fluid goes a long way towards fizing it. what you really need to do is get yourself a cable and the bmw tools setup so you can access the cylinder rough running diag and see which cylinder pegs the knock sensor. if they're all even, it's probably not the enging causing it. also, ESS things sometimes cause rough running.
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