m3 running from cold

[gaz1234]

my new m3 feels like its misfiring when cold. is there anything i can check to see what this could be?
do i need t5o leave it running for a minute or so?

thanks

[0836whimper]

e46 (S54 engine) or e9X ?

[stabilio]

If its E46, isnt nice when cold
Kangaroo and hesitation are normal until oil gets warm.
I leave mine in auto/s2 and go very lightly on throtle for first few mins.

If your on about E9X, then ignore the above

[Nedz]

My E46 m3 is the same when just started from cold.Usually only runs rough for about 30 sec or so though.

[gaz1234]

yea e46, was missing badly and driving with no revs and exhaust was spluttering. all for about 30seconds then started to behave.
so took it for a cain as i thought it needed it

on a serious note, when moving forward slightly in 1st gear and putting the clutch back down its making a little rattle. again normal?

[mysticm]

rattle may be a bit of tranmission shunt,
as for the misfire and not reving, that cetainly isnt right, mine is just a bit lumpy, never misfired and will rev no problem.
might need map sensor or something similar, sound like a fueling/air intake prob , get it on a dianostic machine with a bm specilist, prob need a sensor changing hopefully nothing to much.

[gaz1234]

yea will do, tis due an insp 2 in 6k

[paf291x]

hi mate from cold this is a characteristic of the car you can leave the engine warm up about 3 mins before driving or i have heard that the evolve remap will cure it......i just give mine time to warm up and it's smooth.....hope this helps....

[blondini]

paf291x said:

hi mate from cold this is a characteristic of the car you can leave the engine warm up about 3 mins before driving or i have heard that the evolve remap will cure it......i just give mine time to warm up and it's smooth.....hope this helps....

Yeah, it's a bit of a feature, power delivery feels slightly hesitant as though it is stumbling. There's a reason for this for which I could dig out an explanation but in the OPs case I think something is actually amiss,(no pun intended honest), as he goes on to say:

gaz1234 said:

yea e46, was missing badly and driving with no revs and exhaust was spluttering. all for about 30seconds then started to behave.
so took it for a cain as i thought it needed it

[gaz1234]

also noticed a bit of a squeel/whine when cold, gonna call the garage to sort this under the warranty as its only 3 days old

[deanobeano]

I remember my E46 a few years ago. It was embarrassing when cold. Seemed like the throttle was to sensitive. Drove like a kangerroo(?sp)