MINI2 - MINI Forum - View Single Post - Why do MCSs feel so wierd to drive when cold?

Richard Crofts · Oct 2nd, 2007, 03:17 PM

Quote: Originally Posted by MarkXR (original)

O2 Sensors should have fully warmed up within about 30secs of recieving a live feed, at least my Innovate LC-1 on the track car does can't see the mini ones being any different.

When ensuring your car is fully warmed up before booting it you should really use engine oil temp rather than water temp, obviously not always possible as not many cars have oil temp guages. God I love my aux oil temp guage

Yes the reason I use engine temp is at least if thats hit warm then the oil has stood some chance of getting warmed enough to at least be some of the way to being "fluid" enough to deal with my right foot

I aint got oil temp yet but its in the pipeline along with some other guages and senors

Oh and its not just the O2 sensors that are the issue according to folk I have spoken to, its to do with what the cars "using" in terms of deciding fuel delivery. Eg open and closed loop. It is usually faster than 3 mins but depending on the car and other factors it can take longer than 30 seconds for a cold start MINI to "settle" and reduce the issue of surging under throttle when cold. It only really starts to disappear as the car gets nioce and warm...which takes abot 3-5 mins of tickover or gentle driving IMO from past experience. if you fire the car up and listen to it, you'll hear when it suddenly changes...the pitch of the engine changes as does exhaust note and smoothness of idle.

Oct 2nd, 2007, 03:17 PM	#11
Richard Crofts THE STICK Join Date: Feb 2003 Location: Worcestershire WR15 Local Time: 10:43 AM Posts: 3,180 Offline	Quote: Originally Posted by MarkXR (original) O2 Sensors should have fully warmed up within about 30secs of recieving a live feed, at least my Innovate LC-1 on the track car does can't see the mini ones being any different. When ensuring your car is fully warmed up before booting it you should really use engine oil temp rather than water temp, obviously not always possible as not many cars have oil temp guages. God I love my aux oil temp guage Yes the reason I use engine temp is at least if thats hit warm then the oil has stood some chance of getting warmed enough to at least be some of the way to being "fluid" enough to deal with my right foot I aint got oil temp yet but its in the pipeline along with some other guages and senors Oh and its not just the O2 sensors that are the issue according to folk I have spoken to, its to do with what the cars "using" in terms of deciding fuel delivery. Eg open and closed loop. It is usually faster than 3 mins but depending on the car and other factors it can take longer than 30 seconds for a cold start MINI to "settle" and reduce the issue of surging under throttle when cold. It only really starts to disappear as the car gets nioce and warm...which takes abot 3-5 mins of tickover or gentle driving IMO from past experience. if you fire the car up and listen to it, you'll hear when it suddenly changes...the pitch of the engine changes as does exhaust note and smoothness of idle.