rough idle & engine stumble

[bimmerboy325]

Hello everyone. Would like some advice about an issue with my 4BW. It's a 23 6 spd with about 13,000km.

A few weeks after picking up the car from the dealer there has been an odd engine stumble/miss just off idle. Took it to the dealer a couple time and nothing was detected with any scans, no check engine light. The issue is less now but still an annoyance. Throttle response at low rpm is lacking it seems, no bucking or anything of that sort. 1500 - 2000 rpm the engine wakes up and seems to run alright.

My dealer has been great to work with but a car like this isn't their specialty. They are more of a GM truck dealer.

Any thoughts or ideas?

Thank you for the time.

 

[seattlecubes]

Do you always fill up at the same gas station? If not, what kind of fuel do you use?

 

[BimmerFan]

Mr./Mrs. Seattle lives in Dallas? Anyway, that was my initial thought as well, some bad gas.

 

[bimmerboy325]

Same stations, same fuel.

Shell 91 or Mobil/Esso 93

 

[seattlecubes]

Makes me wonder if your spark plugs are fouled or fouling. It’s just off of idle? What happens when you let it rip?

 

[bimmerboy325]

Yes just off idle is the issue. Let it rip and it seems alright. Quick for sure but won't tear my head off.