Vibration under load at 70-75mph

tom9192 · 10-07-2018, 12:00 PM

I have an '06 325i with about 145k miles on it. There is a vibration at ~70-75 mph but only when in gear(doesn't matter which) and only when the engine is under load. This leads me to believe that it has to be something rear of the transmission (tied to mph not rpm), and rules out tire imbalance (only under load).

So this leaves me with driveshaft, diff, axles, and ???. I recently replaced the DMF with a SMF and replaced the GUIBO and transmission mounts at that time.

Does anyone have any ideas what to check or how to further diagnose? I really don't want to take it into the stealership, but the vibration is quite annoying.

Thatwhitebim · 10-07-2018, 05:29 PM

Quote:

Originally Posted by tom9192

I have an '06 325i with about 145k miles on it. There is a vibration at ~70-75 mph but only when in gear(doesn't matter which) and only when the engine is under load. This leads me to believe that it has to be something rear of the transmission (tied to mph not rpm), and rules out tire imbalance (only under load).

So this leaves me with driveshaft, diff, axles, and ???. I recently replaced the DMF with a SMF and replaced the GUIBO and transmission mounts at that time.

Does anyone have any ideas what to check or how to further diagnose? I really don't want to take it into the stealership, but the vibration is quite annoying.

I had the same issue where my car would vibrate and start shaking around there too. But when I would give throttle it would vibrate as well. Didn't matter what gear I was in. Ended up being a crappy valve cover gasket and I changed out my direct ignition coils.

Runs like a gem now

tom9192 · 10-08-2018, 06:35 AM

I'm guessing this was whenever you certain RPM? Not just around a specific mph? I don't think my vibration could be this as it is only at a certain speed. Also I just changed the valve cover gasket not too long ago

tom9192 · 10-19-2018, 02:11 PM

Went ahead and ordered a remanufactured driveshaft from Driveline service of Portland. $420 and 2.5 hours later it runs great with no more vibrations. There was noticeable play in all of the joints which I'm guessing was causing the vibration.

10-07-2018, 12:00 PM	#1
tom9192 Private 23 Rep 78 Posts Drives: 325i '06 Join Date: Oct 2017 Location: North Carolina iTrader: (0)	Vibration under load at 70-75mph I have an '06 325i with about 145k miles on it. There is a vibration at ~70-75 mph but only when in gear(doesn't matter which) and only when the engine is under load. This leads me to believe that it has to be something rear of the transmission (tied to mph not rpm), and rules out tire imbalance (only under load). So this leaves me with driveshaft, diff, axles, and ???. I recently replaced the DMF with a SMF and replaced the GUIBO and transmission mounts at that time. Does anyone have any ideas what to check or how to further diagnose? I really don't want to take it into the stealership, but the vibration is quite annoying.
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10-08-2018, 06:35 AM	#3
tom9192 Private 23 Rep 78 Posts Drives: 325i '06 Join Date: Oct 2017 Location: North Carolina iTrader: (0)	I'm guessing this was whenever you certain RPM? Not just around a specific mph? I don't think my vibration could be this as it is only at a certain speed. Also I just changed the valve cover gasket not too long ago
	Appreciate 0 Quote

10-19-2018, 02:11 PM	#4
tom9192 Private 23 Rep 78 Posts Drives: 325i '06 Join Date: Oct 2017 Location: North Carolina iTrader: (0)	Went ahead and ordered a remanufactured driveshaft from Driveline service of Portland. $420 and 2.5 hours later it runs great with no more vibrations. There was noticeable play in all of the joints which I'm guessing was causing the vibration.
	Appreciate 1 Phyrexia502.50 Quote