Eratic Idle

[alanm73]

My MCS seems to of developed an eratic idle,when sitting still in traffic it seems to fluctiate between 800 and just over 1000 rpm?

Anyone got any ideas or is a trip to Menzies on the cards?

[sedgie]

wot should it sit at??:I

[snooze]

my car has been doing the same, i went to the garage with it last week, they said the car was fine. Do you feel the shakes the the floor?

[snooze]

sorry meant to say through the floor!

[Neil and Lorna]

Do you have air con?

If you do its probably that cause mine doest it as well.

Apparently the air con compressor is driven by a belt somewhere and puts a strain on the engine at idle.

Neil.:D

[Burple]

I was expecting a Python joke.. then i realised I wasn't in OT&B! ;):I:D:D

[snooze]

no i never use the aircon! the idle doesnt really move but you can feel it shaking and hear it doingsomething. the garage felt the shaking but after having a look at it they saif it normal! dont think so!!

[john]

My GP did this, there was an Air leak at the supercharger;)

[snooze]

did your car shake with out the idle moving?

[snooze]

this air leek in the super charger, did the garage fix it for you?

[alanm73]

Never had the A/C on for weeks so cant be that.

Also noticed when it is idleing eratically if you blip the throttle and give it some revs when it returns back to idle the revs dip quite a bit before going back up to 800 rpm ish.

[AN03REW]

Does it ever feel like the car is going to stall because the revs are to low?

[alanm73]

Yeh it does that's why i end up giving it a bit of revs

[AN03REW]

is spark plugs old? no lights showing on dash? i'd take it to the doctors.

[alanm73]

Its only done 9.5k so not even had the 1st service yet.

Strangly it started about the same time I test drove the R56 Cooper S.

Maybe the car is upset i was looking at others!!!

[AN03REW]

I dont know you hear so much storys about bad fuel and stuff. Try a tank of v max. But if it was something real bad warning lights would light up, surly. They did when my car broke a valve sring with 170 miles on the clock, 3 days old. The car started to run on only 3 cylinders, stall and sound ruff.

[snooze]

my idle doesnt really move but the car shakes and vibrates! you can hear the engine doing something! bmw say they feel the shakes but there bent little computer says nothings wrong!!!