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Rough idle

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Brads67
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Rough idle

Post by Brads67 » Wed Mar 11, 2020 9:55 am

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.
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enuff_zed
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Rough idle

Post by enuff_zed » Wed Mar 11, 2020 10:05 am

Leaking injector? flooding a cylinder?
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baconJazz
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Rough idle

Post by baconJazz » Wed Mar 11, 2020 11:16 am

Dirty MAF sensor ? :driving:
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Brads67
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Rough idle

Post by Brads67 » Wed Mar 11, 2020 7:10 pm

Will have a look at the MAF first.

Thanks for the ideas
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enuff_zed
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Rough idle

Post by enuff_zed » Wed Mar 11, 2020 7:11 pm

Brads67 wrote: ↑Wed Mar 11, 2020 7:10 pm 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.
HQ of 'Norfolk Zed Rescue'.
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Smartbear
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Rough idle

Post by Smartbear » Wed Mar 11, 2020 7:12 pm

Low battery possibly, try measuring the voltage after it’s been sitting for a while :?
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ph001
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Rough idle

Post by ph001 » Wed Mar 11, 2020 10:01 pm

Please state what engine you have! If it’s the M54 it could be a split in the intake hose like this...
viewtopic.php?f=11&t=120521&hilit=Hose
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enuff_zed
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Rough idle

Post by enuff_zed » Thu Mar 12, 2020 9:44 am

ph001 wrote: ↑Wed Mar 11, 2020 10:01 pm Please state what engine you have! If it’s the M54 it could be a split in the intake hose like this...
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?
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Brads67
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Rough idle

Post by Brads67 » Thu Mar 12, 2020 10:05 am

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.
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ph001
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Rough idle

Post by ph001 » Thu Mar 12, 2020 10:53 am

In that case you have to start by changing the battery and eliminate it if nothing else.
2007 E85 Z4 3.0Si manual :driving:
19" CSL's | Eibach Springs | Aeroskirts | Z4M front bumper | Clear brake light | ZHP | RCH+| Stubby

2004 E46 M3 coupe manual - gone but not forgotten.

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Brads67
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Rough idle

Post by Brads67 » Sun Feb 19, 2023 8:19 am

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