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  #1  
Old 06-26-2019, 09:34 AM
simon280 simon280 is offline
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Location: Cincinnati
 
Join Date: Sep 2017
Posts: 13
Mein Auto: 650i E64
2012 650 convertible M Sport weird vibration under acceleration

Interested to see if somebody can advise on this issue... I got a great deal on my 650 from a dealership plus 100k mile power train warranty. This problem was noted by me and agreed by the dealer on the test drive, but, I was REALLY wanting the car and it came with a warranty so I bought it.

The best way I can describe the issue is - under hard acceleration it feels like one set of wheels is randomly running over small strips of wood in the road. Maybe 1/16Ē tall. Small flat strips. And randomly. Maybe under hard acceleration itís every 1/4 second, sometimes itís a lot less. Itís an X Drive model. I thought. Wrong sized tires on one axle and itís torquing the shafts then jumping a wheel? All 4 tires are 245/40/19. Looks like that might not be it. Iím also thinking misfire? But it runs smooth all other times and idles smoothly. Maybe an X drive fault but the dealership had the codes read and said there were none.

Any input from you fine folks?

Thanks in advance! Simon.
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  #2  
Old 07-31-2019, 11:10 AM
6series 6series is offline
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Mein Auto:
2016 650i, vibration under load like rough pavement, most prevalent between 35 and 40 and that's 70 under cruise control to 75.
Tires and wheels forsed balance, new tires, new cat converter new drive shaft, two high pressure fuel pumps, new O2 sensors.
Still vibrates, like rough road.
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Old 08-02-2019, 04:16 AM
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645/333 645/333 is offline
Michael
Location: UK
 
Join Date: Jun 2010
Posts: 1,908
Mein Auto: BMW 640i SE Convertible
What about the guibo joint on the drive shaft???
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Always said I would go back to a 6 series
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  #4  
Old 08-10-2019, 12:07 PM
simon280 simon280 is offline
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Location: Cincinnati
 
Join Date: Sep 2017
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Mein Auto: 650i E64
Update

Update. I had a tuning company drive the car while they had a laptop plugged in. Turns out cylinder 8 has a bad misfire under load. I bought 8 new coil packs and 8 new double platinum plugs (rock auto - $206). They are being fitted Monday. Should solve everything. Hopefully.

Thanks all for the replies though. Itís appreciated!
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Old 08-11-2019, 01:15 AM
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645/333 645/333 is offline
Michael
Location: UK
 
Join Date: Jun 2010
Posts: 1,908
Mein Auto: BMW 640i SE Convertible
It is always good when you find the cause, helps others if they have similar issues
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Old 08-11-2019, 07:17 AM
640ijims 640ijims is offline
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Location: Florida Gulf Coast
 
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Mein Auto: 18 X5M, retired 640i vert
That is an realistic fix


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