Just bought the car drives like a dream but idle I a bit lumpy. I know its a four pot but its not a smooth idle the rev counter skips a bit as well, only a little but noticeable
Any help or advice please.
A
lumpy idle on z4 2.0i sport
-
- Joined: Tue 26 Jan, 2016 20:37
- Posts: 57
- Contact:
lumpy idle on z4 2.0i sport
Who says size doesn't matter? After a straight 6 3.0 litre....Its hard to go back .
-
- Joined: Fri 12 Jun, 2009 12:11
- Posts: 252
- Location: Diss
Re: lumpy idle on z4 2.0i sport
It could be the idle control valve needs a clean. I had lumpy idle for years wih my Z3 and that completely cured it. My post about it is here
http://www.zroadster.net/forum/viewtopi ... ol#p404881
But, of course, thats for a 6 pot Z3, not yuor Z4, but I believe you have one as well.
http://www.zroadster.net/forum/viewtopi ... ol#p404881
But, of course, thats for a 6 pot Z3, not yuor Z4, but I believe you have one as well.
Re: lumpy idle on z4 2.0i sport
1) I would first check for any splits in the MAF sensor/intake rubber bellows – common BMW issue.
2) If you disconnect the MAF sensor and start the car, does the idle improve?
3) Do you have any timing chain noise at idle – a rattle will be more noticeable on a warm engine – a slack chain caused by a weakened tensioner has been known to cause a slightly erratic idle. Certain 2.0 BMW petrol engines (and some diesels) were known for this.
2) If you disconnect the MAF sensor and start the car, does the idle improve?
3) Do you have any timing chain noise at idle – a rattle will be more noticeable on a warm engine – a slack chain caused by a weakened tensioner has been known to cause a slightly erratic idle. Certain 2.0 BMW petrol engines (and some diesels) were known for this.
-
- Joined: Tue 26 Jan, 2016 20:37
- Posts: 57
- Contact:
Re: lumpy idle on z4 2.0i sport
Hi John yes I have a Z3 as well and have considered doing the ICV.John Wilson wrote:It could be the idle control valve needs a clean. I had lumpy idle for years wih my Z3 and that completely cured it. My post about it is here
http://www.zroadster.net/forum/viewtopi ... ol#p404881
But, of course, thats for a 6 pot Z3, not yuor Z4, but I believe you have one as well.
Thanks I will look at doing both cars, cant hurt for sure.
A
Who says size doesn't matter? After a straight 6 3.0 litre....Its hard to go back .