The dreaded rough idle!

Mikeragu · 10-21-2018, 01:40 PM

Good afternoon my fellow e90 owners!!

I have the dreaded rough idle on my stock 07 328xi..

I changed the Vanos solenoids, plugs, coils, air filter. Still have the damn rough idle! idle. My car was throwing the damn P052B code. I reset it, it never came back. Now my question is for those who have experience with this issue. Is it the cam sensor or a vacuum leak?! The car hasn't thrown a code since I reset it. Good news the sensor is covered under my warranty. Bad news a vacuum leak isn't. Check the video out let know what you guys think! and yes the rough idle was there prior to changing the vanos solenoids.

lowrydr310 · 10-23-2018, 05:36 PM

Get yourself a BMW scan tool and read the BMW-specific codes as they'll likely be able to help you more than the generic OBD-II "P" codes. You'll get much more detail. With regards to any cam/timing codes, the BMW-specific DME codes will tell you specifically what sensor (intake or exhaust cam sensor, or VANOS solenoid) is causing the issue.

Mikeragu · 10-23-2018, 06:37 PM

Quote:

Originally Posted by lowrydr310

Get yourself a BMW scan tool and read the BMW-specific codes as they'll likely be able to help you more than the generic OBD-II "P" codes. You'll get much more detail. With regards to any cam/timing codes, the BMW-specific DME codes will tell you specifically what sensor (intake or exhaust cam sensor, or VANOS solenoid) is causing the issue.

Thanks for your reply, I changed the camshaft intake sensor today along with the mass air flow sensor. Idle got a little better but now it's throwing the P00BC code as it was with the old mass air flow sensor. Any thoughts?

Mikeragu · 10-23-2018, 06:38 PM

Quote:

Originally Posted by lowrydr310

Get yourself a BMW scan tool and read the BMW-specific codes as they'll likely be able to help you more than the generic OBD-II "P" codes. You'll get much more detail. With regards to any cam/timing codes, the BMW-specific DME codes will tell you specifically what sensor (intake or exhaust cam sensor, or VANOS solenoid) is causing the issue.

Also I switched the plug on the vanos by accident when I put them back so now that code is gone

WagonDragonE90 · 07-03-2019, 05:49 PM

Quote:

Originally Posted by Mikeragu

Thanks for your reply, I changed the camshaft intake sensor today along with the mass air flow sensor. Idle got a little better but now it's throwing the P00BC code as it was with the old mass air flow sensor. Any thoughts?

Any resolution on this?

I just replaced my valve cover gasket during a valvetronic range sensor replacement and now I am getting the P00BC code as well.

10-21-2018, 01:40 PM	#1
Mikeragu New Member 2 Rep 18 Posts Drives: 07 328xi Join Date: Aug 2018 Location: Brooklyn iTrader: (0)	The dreaded rough idle! Good afternoon my fellow e90 owners!! I have the dreaded rough idle on my stock 07 328xi.. I changed the Vanos solenoids, plugs, coils, air filter. Still have the damn rough idle! idle. My car was throwing the damn P052B code. I reset it, it never came back. Now my question is for those who have experience with this issue. Is it the cam sensor or a vacuum leak?! The car hasn't thrown a code since I reset it. Good news the sensor is covered under my warranty. Bad news a vacuum leak isn't. Check the video out let know what you guys think! and yes the rough idle was there prior to changing the vanos solenoids. Last edited by Mikeragu; 10-21-2018 at 04:20 PM.. Reason: video link
	Appreciate 0 Tweet Quote

10-23-2018, 05:36 PM	#2
lowrydr310 Robot 1651 Rep 2,168 Posts Drives: 2006 330i, 2007 E93 335i Join Date: Apr 2013 Location: Souhtrne Califniora iTrader: (0)	Get yourself a BMW scan tool and read the BMW-specific codes as they'll likely be able to help you more than the generic OBD-II "P" codes. You'll get much more detail. With regards to any cam/timing codes, the BMW-specific DME codes will tell you specifically what sensor (intake or exhaust cam sensor, or VANOS solenoid) is causing the issue.
	Appreciate 0 Quote