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-   -   M62TU Dreaded cyl 7 misfire (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/104394-m62tu-dreaded-cyl-7-misfire.html)

upallnight 03-20-2020 08:38 AM

Quote:

Originally Posted by wpoll (Post 1179741)
Do you have to clear error codes once the DME shuts down a cylinder due to misfire?

If you turn off the engine, the engine misfire counter reset so the next time you restart the engine the injector will not be turned off until the misfire counter approch that magical number where it will turn off the injector. That is why people post "the engine was running like shit but if I turn off the engine and restart the engine it runs beautiful, whats is the problem?"

Ryoken 03-29-2020 08:30 PM

sorry to hijack this. every now and again ,. maybe once every few months, my m62, runs like a dog, I can run it one time turn engine off , fire it back up and it dies on cylinder 7,, its always number 7.
its an oil fouled plug, so no spark on that, everything else tests ok, I know ive got a OK CCV on the rear of the intake , its the little vacuum pipe that connects to it that's disintegrated , I just don know why its always number 7 :)
after the current lock down has passed I want to get her in for a compression test

andrewwynn 03-30-2020 11:46 AM

Replacing a couple weak coil packs and finally using some Lucas injector cleaner and no codes a year and counting.

Purplecty 04-02-2020 09:45 AM

Replaced the PCV(Kayser) and OSV(Genuine BMW) and on INPA cylinder roughness screen, cylinder 7 still had high number and then engine still felt like it had the slight misfire. Moved the coil(bremi) and spark plug(NGK-BKR6EIX) from 7 to 6 and 6 to 7 and then watched the cylinder roughness again and it moved to cylinder 3 where 6 and 7 seemed within acceptable range now. This all happens after the X warms up. I can still hear the driver side exhaust has a slight misfire at idle. What gives?

andrewwynn 04-02-2020 03:38 PM

M62TU Dreaded cyl 7 misfire
 
Have you run injectors cleaner? If so the next step I would do is clean the injectors with the machine

Purplecty 04-02-2020 04:13 PM

I do have a fuel tank vent valve error and it seems to not be functioning. Can this cause a similar issue? It only starts acting up when the engine gets warmed up...

andrewwynn 04-03-2020 08:41 PM

If failed open not a big deal. If failed closed it will crumple the tank like a beer can


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Purplecty 04-13-2020 09:31 AM

So I did an 88c tstat at the same time and upon bleeding the valley pan blew(what luck right?) So I ended up doing the valley pan, a full intake reseal including TB gasket and valve cover, vanos solenoid, UTCG gaskets and new NGK +4 plugs amd a new GRAF water pump as well. I can report back that the motor is running buttery smooth now but its hard to pinpoint the exact culprit after all that was done. The fuel tank vent system(not valve error) error is still there so this was not related to the engine roughness I was experiencing...

https://uploads.tapatalk-cdn.com/202...b1528d5b7d.jpg https://uploads.tapatalk-cdn.com/202...330c1b1ec6.jpghttps://uploads.tapatalk-cdn.com/202...11505987dd.jpghttps://uploads.tapatalk-cdn.com/202...5b269835bb.jpghttps://uploads.tapatalk-cdn.com/202...d952970e3a.jpghttps://uploads.tapatalk-cdn.com/202...6d5ef38173.jpghttps://uploads.tapatalk-cdn.com/202...aaa1c448ec.jpghttps://uploads.tapatalk-cdn.com/202...7db8271f02.jpg

CapeX5 04-13-2020 04:00 PM

Rough
 
Can you elaborate on what "rough running" shows you? I have seen that screen but never know how to interpret it. Thanks
Quote:

Originally Posted by Purplecty (Post 1181343)
So I did an 88c tstat at the same time and upon bleeding the valley pan blew(what luck right?) So I ended up doing the valley pan, a full intake reseal including TB gasket and valve cover, vanos solenoid, UTCG gaskets and new NGK +4 plugs amd a new GRAF water pump as well. I can report back that the motor is running buttery smooth now but its hard to pinpoint the exact culprit after all that was done. The fuel tank vent system(not valve error) error is still there so this was not related to the engine roughness I was experiencing...

https://uploads.tapatalk-cdn.com/202...b1528d5b7d.jpg https://uploads.tapatalk-cdn.com/202...330c1b1ec6.jpghttps://uploads.tapatalk-cdn.com/202...11505987dd.jpghttps://uploads.tapatalk-cdn.com/202...5b269835bb.jpghttps://uploads.tapatalk-cdn.com/202...d952970e3a.jpghttps://uploads.tapatalk-cdn.com/202...6d5ef38173.jpghttps://uploads.tapatalk-cdn.com/202...aaa1c448ec.jpghttps://uploads.tapatalk-cdn.com/202...7db8271f02.jpg


Purplecty 04-13-2020 04:19 PM

The lower the numbers the smoother it runs.


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