smoke on boost

hi,

was having a blast with a bmw yesterday and when i was at around 7k rpm i shifted to 5th and noticed a puff of either white or blue smoke from my exhaust.

slowed down after that and didnt notice any loss of power and no smoke through any other gear on boost just seemed to be the 4th to 5th shift. anyone have any idea what it could be?

thanks in advance

sye

nobody? also ive noticed a slight drop in power, if my car det's and i have an avcr im correct in saying that it wont limit my boost, just make it run pretty bad?

could just be blowing some crap out the exhaust as i take it you dont rev it that high like everyday? check it on the overun go in to like 4th gear at low revs let it build up then let of seee if lots of smoke comes out tehn

no dont really drive it in that range often, no signs of smoke anywhere else, my avcr after that dropped to 0.9bar and now the avcr is hitting 1.1bar of boost which use to be a solid stable 1bar but a little less power, i did have an issue with the car sometimes going into safemode and cutting the boost to 0.5 so wondering if this may be the issue but the avcr is still trying to boost it, ill reset ecu tonight i think

if it just smoked the once I wouldn't worry tbh as could just be that it needs a run to clear it out

the other issue will be separate though, could be a prob with the avcr control solenoid or maybe a vacuum leak

thanks guys i reset the ecu and seems to be running alot better and lowered the duty on the avcr which sorted the over boosting but now a whole new set of electrical problems wtf when i lift off the throttle my window wipers come on   

that is bad earth connections as had that happen before
check clean and tighten all earths under the bonnet

ok will do bob thanks, may be related to my handbrake light (dont know if they are connected to each other) as light goes out and wiper problem starts, ill get it checked over this weekend, i hate electrics.

did you get my message with my phone number?

yep il give you a call in a minute if its ok