misfire cylinders 6-10

J70SGN · Sep 15, 2014

Hi guys got a bit of a misfire problem.
Car has 101k miles.
Just had bank 1 O2 sensors renewed as they were throwing up codes and the CEL light.
Now the car seems to have developed misfires on bank 2 along with the bank 2 O2 sensors flagging up codes.
Specifically codes p2629 p0300 p0306 through to p0310.
My thinking is that because bank 2 O2 sensors are the same age as the bank 1 sensors that were replaced haven't been replaced they are completely gone and causing the misfires. Any help would be greatly appreciated.
Cheers
Scott

Guest · Sep 15, 2014

I would swap the ionic module and clear the codes and see if the misfires move to bank 1.

Also check the oil filter

J70SGN · Sep 15, 2014

Where abouts is this ionic module located?
She is due a spark plug change and vehicle check. Oils not due for another 2k miles it ill be getting that changed at the same time as the plugs

B767capt · Sep 15, 2014

J70SGN said:
Where abouts is this ionic module located?
She is due a spark plug change and vehicle check. Oils not due for another 2k miles it ill be getting that changed at the same time as the plugs

They are on the top front of each head under that black plastic dome shape cover. You have one for each bank. Swap them and see if the misfires move over to the other side like Troy suggested.

http://www.realoem.com/bmw/showparts.do?model=NB93&mospid=48807&btnr=11_3687&hg=11&fg=15

It's under #15 and the sensor is #20.

UNCIVIL · Sep 16, 2014

Dang man. At least you didn't get misfires on all 10 cylinders like mine.

Guest · Sep 16, 2014

it is in this pic

If your engine didn't fail. Start changing your oil every 5k miles. Or you will be calling me soon for a motor. You don't want to call me. ;-)

The Engineer · Sep 16, 2014

TROY JEUP said:
View attachment 470562 it is in this pic

If your engine didn't fail. Start changing your oil every 5k miles. Or you will be calling me soon for a motor. You don't want to call me. ;-)

Sucks you can't take it apart and fix it! It's one of those consumable parts. No screw holes anyone on the dang thing!

The Engineer · Sep 16, 2014

FYI: Troy is most likely right. Just had the same problem a few weeks ago!

J70SGN · Sep 16, 2014

Cheers guys. I'll give that a look once I get home in 4 weeks

Hard5 · Sep 17, 2014

Yep - IONIC sensors.

My car. with 114K miles did the same thing. I went ahead and replaced both sensors - a 30min job at best

Guest · Sep 19, 2014

Hard5 said:
Yep - IONIC sensors.

My car. with 114K miles did the same thing. I went ahead and replaced both sensors - a 30min job at best

Please Change your bearings. Two more motors failed today from board members (78k and 96k) I can't supply them fast enough.

J70SGN · Oct 22, 2014

Hey guys changed the modules ran away fine then limp mode came on. getting 306-310 and 300 then it clears it's self then comes back. Think its still got something to do with the 2 O2 sensors I've yet to replace have them on order. Will keep you posted

misfire cylinders 6-10

Our Vendors

Top Contributors this Month

Recommended Communities