Rough idle

[Brads67]

Folks

The Z4 sits for a while in between uses. A couple of time when I've fired it up it has a super rough idle, once it also took a few attempts to start.

Once running it simply clears and is fine.
Are there any know causes for this, a common fault maybe ?

Cheers all.

 

[enuff_zed]

Leaking injector? flooding a cylinder?

 

[baconJazz]

Dirty MAF sensor ?

 

[Brads67]

Will have a look at the MAF first.

Thanks for the ideas

 

[enuff_zed]

Will have a look at the MAF first.

Thanks for the ideas

If not that then leave it a few days to sit, then whip the plugs out and see if there's a wet one.

 

[Smartbear]

Low battery possibly, try measuring the voltage after it’s been sitting for a while :?
Rob

 

[ph001]

Please state what engine you have! If it’s the M54 it could be a split in the intake hose like this...
https://z4-forum.com/forum/viewtopic.php?f=11&t=120521&hilit=Hose

 

[enuff_zed]

Please state what engine you have! If it’s the M54 it could be a split in the intake hose like this...
https://z4-forum.com/forum/viewtopic.php?f=11&t=120521&hilit=Hose

A point I am keeping in mind for wifey's M54, just in case.
However, would the OPs idle clear itself if it were this?
I was surmising an issue that cured itself as things warmed up?

 

[Brads67]

It's the 2.2
I've had the split hose thing before, it's not that. It clears once running for a minute or even less.
Battery is a good shout as it has a habit of going flat just now. Could just be a low voltage.
Will check all these when the chance allows.

Thanks for the ideas again.

 

[ph001]

In that case you have to start by changing the battery and eliminate it if nothing else.

 

[Brads67]

Been a while lol
It was the ICV needing a good clean.