E30 320iSE 1991 Running/Choke problem

Hi all, my E30 is having running problems and I could do with a hand.
It idles and revs fine until warmed up, plenty of power available, then
once warm it starts to run rough, sometimes stalling at idle. The
exhaust becomes smokey at this point also, as if the mixture is far too
rich. Sounds like the choke isn't releasing once it's up to temp. The
ICV, throttle body and injectors have been cleaned through and new
plugs installed recently, no difference. Anyone had a similar
experience? Thinking of renewing all vacuum hoses as they're the
originals, and cleaning sensor connectors etc. Any idea what i should
try next? Is there any way to test for a faulty temp sensor or O2
sensor at home without bmw diagnostics kit?

Thanks very much!

Mark

John Burns wrote:
> > It idles and revs fine until warmed up, plenty of power available, then
> > once warm it starts to run rough, sometimes stalling at idle. The
> > exhaust becomes smokey at this point also, as if the mixture is far too
> > rich. Sounds like the choke isn't releasing once it's up to temp. The
> > ICV, throttle body and injectors have been cleaned through and new
> > plugs installed recently, no difference. Anyone had a similar
> > experience? Thinking of renewing all vacuum hoses as they're the
> > originals, and cleaning sensor connectors etc. Any idea what i should
> > try next? Is there any way to test for a faulty temp sensor or O2
> > sensor at home without bmw diagnostics kit?
>
> I'm guessing this is a UK car, so no O2 sensors as there's no cat.
> Sounds like a bad temp sensor is leaving the car in cold start mode all
> the time.
>

Thanks John, yes you're right it is a UK car, I didn't realise they
didn't have the O2 sensor! I'll have a go at checking the temperature
sensor and its connections, hopefully I can just do this with a
multimeter.

Cheers

Mark