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BMW Mini N12 2008 - VVT fault - Fixed #

Posted by Simon Forsey on October 14, 2013, 8:50 am

Year of Manufacture *: 2008
Engine Size and Code *: N12
( Optional ) ECU Type: MEV17.2
( Optional ) Scanner Used: Autologic
( Optional) Fault Codes: No relavant DTCs

Known Good

Known Bad

Hi

This vehicle will intermittently start and run rough. No relevant DTCs. You can switch off the Ign and restart and it will run fine then repeat and it can run bad again.

Oil and filter changed after a flush.

New spark plugs even though its only done 54000km

Checked fuel pressure and flow
Checked for Cat blockage
Checked cam and crank signals using pico scope. When the engine is running rough the inlet cam VVT is being activated. Checked wiring which was ok. Re flashed engine PCM with latest software.

Just to be sure rocker cover was pulled off to check VVT solenoids and cam chain and timing. Inlet VVT solenoid has already been replaced before we got it, so this fault must have been apparent before this car was purchased by the dealer, with no history.

Has anyone had an issue like this?

Any help would be appreciated.

Regards

Simon

Re: BMW Mini VVT fault

Posted by steve walker <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1169' width='330' height='300' border=0 style='border:none;'> on October 15, 2013, 10:23 pm, in reply to "BMW Mini VVT fault"
Steve Walker

Hi Simon

Have you removed the vanos (vvt) solenoids and checked the filters on them for blockages , debris?

Might be worth a look

Cheers

Steve

Re: BMW Mini VVT fault

Posted by Simon Forsey <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5231' width='330' height='300' border=0 style='border:none;'> on October 16, 2013, 1:11 am, in reply to "Re: BMW Mini VVT fault"

Hi

They are both new.

We have it back together now. I will let you know how it goes.

Simon

Re: BMW Mini VVT fault

Posted by Rob Nicholson <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5122' width='330' height='300' border=0 style='border:none;'> on October 17, 2013, 8:30 pm, in reply to "Re: BMW Mini VVT fault"

Hi Simon,

Have you checked map sensor fitted in the bottom of the inlet manifold they block up? worth a look

Rob

Re: BMW Mini VVT fault

Posted by Glen Strachan <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat1463' width='330' height='300' border=0 style='border:none;'> on October 9, 2014, 2:46 pm, in reply to "Re: BMW Mini VVT fault"

Was there a fix for this ? I have one exactly the same on a Citroen.
It starts up rough , only if left for a long time , may flag a random misfire fault code, switch off and it will then run fine for the rest of the day.

Fixed #

Posted by Simon Forsey on October 21, 2014, 7:28 am, in reply to "Re: BMW Mini VVT fault"
Edited by board administrator October 23, 2014, 12:20 pm

Hi

This turned out to be a faulty B1S1 O2 sensor.

Genuine item solved the problem.

Regards

Simon

Re: BMW Mini VVT fault

Posted by george ambelas <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3245' width='330' height='300' border=0 style='border:none;'> on October 21, 2014, 8:14 pm, in reply to "Re: BMW Mini VVT fault"
George Ambelas

thanks for sharing this with us can you tell us how you diagnosed it?

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