Hi guys,

I have 2004 R53 Mini cooper S with Cosworth header.

When I drive and push gas pedal, it runs very smooth and no problem.
However, when I wait at signals, sometimes(like once in a week) it stall like one cylinder miss fire. but as soon as I push gas, it is ok.

I have all new spark plug and new coil and 91 gas and no error nor warning lights.

What do you think guys?
If I have warning light or error, I can read a code but there is no error lights.
and it bugs me.

 

One more thing,
I am a 2nd owner and it has Cosworth Package with borla exhaust.
and don't know much about this car's turn and engine.
Head has Cosworth name on it.

 

does it feel lumpy like you have a aggressive cam? then its normal a lot of early minis have this lope at idle sometimes, mine does it too.

 

Oh, Thank you and good to know.
Yes, it does like Boom, Boom, Boom, Boom, then Booooooom like become normal.
Anyway, Thank you. =)

 

Could be the increased flow and lack of backpressure caused by the header and exhaust.
This sometimes happens to me ever since I installed my straight pipe (no backpressure)

It don't think its something you should be worrying about but if you are, a tune should solve this problem