Z3 1.9 rough start up

[alan36]

When I start my car from cold i.e. overnight or after work, it takes a few turns to start and then runs rough for maybe a minute or so and then seems fine. Its only when the engine is cold and has just started doing it after I fitted a new thermostat at the weekend. Is this coincidence or is it something else.

Any help would be appreciated

[MitchT]

My 318is (same 1.9 engine) can have a bit of a lumpy idle for a minute or so when I first fire it up, particularly during cold, damp weather. Then it settles down and it's fine. It's always been like that and it's not an issue. My brother has a Z4 and the manual for that actually states that a initially lumpy idle is normal and simply to let it run smooth before driving away.

[swansea v6]

My 318ti (1.9 16v) is exactly the same, funnily enough after changing the thermostat too!!! Idles very rough at first then settles down to a rock steady idle. Characteristic of the engine I guess??

[disco!!!!]

it may be coincidence but check the crankcase ventilation valve and maybe give it a clean
ive seen this problem on another forum and it turned out to be the ccvv was blocked

[alan36]

Where is the crankcase valve