Dct 5th gear car run rough and shaking when crusing

[andrei.m4]

Someone know about this problem? Crusing in 5th gear at 1300-1450rpm engine run rough like a missfire or something like this. When i push a little more acceleration rough dissapear. In D mode with gearbox in comfort this rough is very stresfull cause when i have road speed restrict car run in 5th gear at 50-55km/h. Instant consumption when this happend is around 5-7 liters/100km. And only in 5th gear, no problems in rest of gears.
Car is bmw f82 2015, bmc air filters, secondary cats deleted.
This thing starts happend about 2 weeks ago, i thinked is from a bad fuel, i changed but roigh still there. Sometimes car rough at idle a little bit shaking of car without semnificative rpm drop or increase on dash.
Edit: i can see fluctuation on sport displays also, power and torque shaking a little

[blockdoc]

Originally Posted by andrei.m4

Someone know about this problem? Crusing in 5th gear at 1300-1450rpm engine run rough like a missfire or something like this. When i push a little more acceleration rough dissapear. In D mode with gearbox in comfort this rough is very stresfull cause when i have road speed restrict car run in 5th gear at 50-55km/h. Instant consumption when this happend is around 5-7 liters/100km. And only in 5th gear, no problems in rest of gears.
Car is bmw f82 2015, bmc air filters, secondary cats deleted.
This thing starts happend about 2 weeks ago, i thinked is from a bad fuel, i changed but roigh still there. Sometimes car rough at idle a little bit shaking of car without semnificative rpm drop or increase on dash.
Edit: i can see fluctuation on sport displays also, power and torque shaking a little

Do you have ISTA, or a way to pull codes?

[andrei.m4]

Yes i have ista d, at what exactly i need to watch cause no errors on log

[andrei.m4]

Aaaand seems to be a little shaking in 3th gear too. Tomorrow I will replace oem spark plugs with ngk gaped at 0.023 as bm3 recomandation.

[andrei.m4]

Spark plugs changed with ngk and gapped at 0.023, same shaking at 5th gear at 1400rpm and sometimes in 3th gear at 1000-1100rpm

[Yessir]

For the time being if it bothers you, until you have time to get it sorted, don't drive In comfort or s1. Sorry I don't have more info for a resolution, but this is what I would do until I could remedy the issue.

[andrei.m4]

I started it today and after 1 min of idling car started some misfire, i was with bm3 diagnostic on it and sometimes it showed misfire count on all cilinder at maximum 1-2-3 but on cylinder 2 missfire count shoed 10 times and i felt every misfire. After 4-5 minuted i stoped the car and i started again an no more misfire.

[andrei.m4]

When i start the car(warmed) timing is around 14-15 engine run nice, after 40-50 seconds timing goes at 22-23 and sometimes misfire prezent at idle, only at idle it misfire. Anyone can help me?

[andrei.m4]

Sorry for too much posts, i solved the problem but only with misfire at idle, my idle was to low, 650 and sometimes drop to ~580 i increased it to 750 but i think 700 is good too and misfire at idle disapeard. Timing advance dropped from 23 to 14-15 and idle is very smooth now :x in first and second gear my speed at idle is same like before.
Hope i will find a way to solve my problem with 5th gear, cause it run like a frog at 1300-1500rpm, i checked and no misfires in this range or other range.

[andrei.m4]

Up, no codes on ista, it started now to make on 6 th and 7th too, when i let the car off for minimum 10-12 hours first 10 minutes it runs so smooth on all gears. The. Again it shaking hard at 1000-1500rpm at light throttle

[vodamerc]

Hi mate, did you ever work out the solution to this issue? I’m having the exact same problem. Thanks in advance

[andrei.m4]

Yes, just yesterday I replaced the dct clutches pack and problem solved, somehow on 5th gear light throttle clutch engage and disengage slowly probably slipping. One more symptom was in first gear downhill no gas just idle clutch engage and disengage continously. New clutch pack problem solved