Z4 loses power on startup

[Tamir]

I first noticed it about 3 weeks ago, it only happens when the engine is cold so that'd be the morning engine start up. Right after the engine starts the RPM drops to nearly 400 before fixing on a steady 1000ish RPM. Most of the times it's just like in the video here:
[vimeo]410969151[/vimeo]
https://vimeo.com/410969151
Sometimes it won't start on first attempt, you'd hear the engine turning but no spark, would have to let it cool so I don't flood it, then it's just fine.

Z4 E85 2004 3.0i Auto
The car drives great and sounds great.
(Don't mind all the warning bulbs, I'm on it )

 

[buzyg]

Sounds like a monitoring issue. Any fault codes?

 

[Ewazix]

Get the codes for sure, but I'd have a quick look at the intake rubber boot for cracks or splits, they are a very common fault that cause rough running and power loss. The don't always set of an eml.

https://z4-forum.com/forum/viewtopic.php?t=70223

 

[Tamir]

Sounds like a monitoring issue. Any fault codes?

Get the codes for sure, but I'd have a quick look at the intake rubber boot for cracks or splits, they are a very common fault that cause rough running and power loss. The don't always set of an eml.

https://z4-forum.com/forum/viewtopic.php?t=70223

Hey guys so I checked for codes I did get some but I don't think they're related

under IHKA/IHKR AC/Heater - 0F AUC sensor
under SBSR Satellite B-pillar, Right - 02 Fault in aerial power supply
and 9913 Seat occupancy detector passenger open circuit
9917 Control unit fault

Does any of that make sense?

 

[wonkydonkey]

And what did you find when you checked the rubber intake hose as suggested above?

 

[Tamir]

And what did you find when you checked the rubber intake hose as suggested above?

It looks in good shape, it is not torn or loose.