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      12-28-2012, 02:04 PM   #23
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I'd recommend changing the spark plugs before changing the coil first... that fixed my issue altogether.
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      12-28-2012, 02:19 PM   #24
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2006 330i  [2.83]
Originally Posted by new0rder View Post
this just to follow up my last post, my rough idling issue. so I did replace my ignition coil, just 1, everything works fine... until now I got another misfire, now its cylinder 6, I guess its on going, I am ordering another one.
Thanks for sharing and follow up. Great info. Keep us posted.
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      Yesterday, 02:16 PM   #25

Drives: 2007 BMW 328iT
Join Date: Jul 2016
Location: Oakland, CA

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Leaking eccentric shaft sensor seal

Been searching the forums for months on this issue and was never able to find anything solid . To be more exact, I had rough idle and bad hesitation on the highway accelerating from low RPM. Issue was worse when the AC was pumping hard to the point where if I pumped the throttle or tried to accelerate from low RPM (about 2500) for any extended period of time there would be hard engine stuttering. At some points I would get the SES light on and once that happened the car was barely driveable; basically couldn't accelerate. Restarting the car would clear the SES light and no codes could be found, but when the SES light was on I was able to pull a pending code: P0303 Cylinder 3 misfire. Great so now I had a place to start. Swapped the ignition coil with Cyl 2 and spark plug with Cyl 1 to see if I could get the SES fault to migrate to one of the other cylinders. While I had the engine cover off I decided to look at the eccentric shaft sensor connector as I had read about he seal leaking oil into it. Sure enough it had a bunch of oil in it, so I cleaned the connector and harness plug out with isopropyl and cotton swabs, then blew it dry with compressed air. Smeared dielectric grease on the harness plug and reconnected it. Took the car out for a spin and no rough idle and no hesitation while accelerating from low RPMS. Even pumped the throttle repeatedly with the AC cranking for the whole 15 minute drive and no hesitation! Took it for a second 15 minute drive an hour later and then a 30 minute the next day and issue still has not repeated. I'm sure the issue will resurface once the oil has had time to leak into the connector again, but at least I know what needs to be replaced: a $7 eccentric shaft sensor seal.
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      Yesterday, 10:25 PM   #26
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Drives: 2007 BMW 328i
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Originally Posted by bimmbo View Post
I'm sure the issue will resurface once the oil has had time to leak into the connector again, but at least I know what needs to be replaced: a $7 eccentric shaft sensor seal.
Typically the sensor fails internally which allows oil to leak into the pins. The seal keeps oil from leaking outside of the valve cover, but the oil will still leak into the connector.

I see that you're in CA, though. Does your 328i have an N51? If so the eccentric shaft sensor is covered by the SULEV warranty for 15 years/150k miles. I had mine (and the valve cover gasket) replaced for no charge at the dealership.
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