Is it possible that something dropped in the intake duct of cylinder nr.1?

 

I can't see how? And if this was case surely id be getting a misfire under load?

Has injector 1 just decided to tilt out or is it related to something?

Also if I unplug injector 1 it makes no difference to idle.

 

Poss a small amount of carbon build up but can't think of anything else.

 

A forum search might help i did a quick one and the first 2 i found are here but must be a lot more.
https://www.bimmerforums.co.uk/forum/f125/320d-e90-163-4b10-smooth-running-fault-t69308/

https://www.bimmerforums.co.uk/forum/f18/2004-320d-se-engine-fault-codes-continued-problems-t83557/

 

I have searched thanks tho. And nothing comes up with same issues i've had.

 

Sounds like something kept a valve open on number one. no or low compression- bent valve or valve not seating.

Did you stuff tissue into the ports?

 

This is what I was after. With bad luck even a larger piece of soot can do this when stuck between the intake valve at a bad moment. But of course injector problem should be ruled out first as this could just be coincidence.

 

Thanks everyone who replied.

So. Touch wood car is now running fine. Yesterday driving home. Car would run fine above 2k revs and shake 2 pieces anything under.
So pulled away from junction car stalled, struggled to start again and i got the hump with it. So pulled away red lining 1st 2nd and 3rd. About 5 secs of smoke. After car then drove fine. Since given it that good blast the car is running and idling fine. Performance is great etc.
So I am guessing I had a tiny bit of soot stuck in the intake valve in Cyl 1. And that by given it some welly has blown it out.

Thanks again for replies, ill deffo be blanking of the intakes if I take the inlet manifold off again.