engine vibration at idle

siphor1989 · 12-15-2016, 06:50 PM

Just wondering if it's normal to be able to feel the engine vibrate at idle. If I place my hand on top of the engine, I can feel quite a bit of vibration. There's no CEL and idle is steady. On another e46 325i, I can do the same thing and barely feel any vibration, it's very smooth.

limitdown · 12-16-2016, 09:34 PM

Potential areas:
Intake valves are dirty and require walnut blasting
Injectors are leaky
Engine mount is worn out

CLRBLND · 12-17-2016, 06:07 PM

Could be misfiring

siphor1989 · 04-26-2017, 11:54 AM

Update: problem ended up being a bad coil. It wasn't bad enough to trigger a misfire code but it did end up fouling the plug. Swapped the coil out for a new one and now idle is smooth and no more vibrations when accelerating. I guess it's been running on a bad coil for months now and I really didn't know how bad it was until I put that new coil in.

12-15-2016, 06:50 PM	#1
siphor1989 Lieutenant 198 Rep 562 Posts Drives: 2020 m340i xdrive Join Date: May 2015 Location: . iTrader: (3)	engine vibration at idle Just wondering if it's normal to be able to feel the engine vibrate at idle. If I place my hand on top of the engine, I can feel quite a bit of vibration. There's no CEL and idle is steady. On another e46 325i, I can do the same thing and barely feel any vibration, it's very smooth. Last edited by siphor1989; 12-15-2016 at 06:56 PM..
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12-16-2016, 09:34 PM	#2
limitdown First Lieutenant 187 Rep 337 Posts Drives: 2007 335i E93 Join Date: Jul 2015 Location: Location iTrader: (0)	Potential areas: Intake valves are dirty and require walnut blasting Injectors are leaky Engine mount is worn out
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12-17-2016, 06:07 PM	#3
CLRBLND Private First Class 13 Rep 162 Posts Drives: 08 335xi Join Date: Sep 2015 Location: Ottawa iTrader: (0)	Could be misfiring
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04-26-2017, 11:54 AM	#4
siphor1989 Lieutenant 198 Rep 562 Posts Drives: 2020 m340i xdrive Join Date: May 2015 Location: . iTrader: (3)	Update: problem ended up being a bad coil. It wasn't bad enough to trigger a misfire code but it did end up fouling the plug. Swapped the coil out for a new one and now idle is smooth and no more vibrations when accelerating. I guess it's been running on a bad coil for months now and I really didn't know how bad it was until I put that new coil in.
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