hi all

cut a long story short!

my bmw when i brought it had not had a service for 40,000miles and 4 years!!!!

now since having it she gives a sharp jolt sometimes and starts miss firing (i thought this was just cause she needs a service!)

took her into my mates garage today and we:

changed

spark plugs (bosh super 4)

oil

oil filter,

fuel filter,

done engine flush

cleaned throttle body (was quiet bad)

after all that took her up road and my god she feels like a new car!!! got power back and its loads more responsive!

well so i thought!!!

took it to the shops 10 min ago and she gave a sharp jolt and started missing again

am i right in thinking that 1 of the coils could have a fault or be on its way out??

cheers

It could well be a failing coil, a poorly seating valve, cam sensor, Vanos solenoid or many other little things... Did you clean the MAF too?

i cleaned maf not so long ago,

diagnostics bringing up crank sensor as well as knock sensor bank 2

so we put the coils back on back to front so the coils that where on bank 2 are now on bank 1 if you see what i mean.

so now its jolting and missing again will try get it back to mates garage to be plugged in again as if it comes up with bank1 knock sensor instead of bank 2 we almost sure it a coil then.

but i didnt think crank sensor would cause it to missfire but it would explain the cutting out i get when sat at idle?

But the ICV should prevent stalling !!

You have the best idea by swapping the coils around to get new code though!

i aint to sure mate as i dont know much about bmws that why took it to mates garage as he a bmw nut lol

but shall keep this thread posted on what happens

just hope it aint nothing to expensive! haha