failed emissions :(

[cro320]

I failed bloody emission test today...
not quite sure where is the problem, cause car runs great and pulls like a train
HC bad at idle 0.3 is good, mine is 0.6%
CO bad at idle 0.5 is good, mine is 0.8%

any ideas what to check?

[clipper]

First I would check that its idling properly.

Does the throttle butterfly close as it should or is the car "idling" with a partly open throttle (a common bodge on cars with idle problems, like mine ).

[jbee]

a tune up could work too

[Alex]

take it to an MOT guy you know

what rpm is it idleing at, i suppose if its ideling to high it could cause high emissions

[town325i]

put a clean air filter in it if its not been change for a long time

[djk]

a tune up could work too

Do you employ a piano tuner for one of those then?

[cro320]

idles perfectly at 700rpm, once had an idle problem and my bmw service done the job, something about TPS was wrong, now works great.
Last month I changed: air filter, fuel filter, sparks, oil and valve adjustment

[clipper]

Sounds like its just the adjuster screw on the AFM that needs setting then. Unless its running rich at idle.....

[cro320]

Sounds like its just the adjuster screw on the AFM that needs setting then. Unless its running rich at idle.....

well mate, to be sure I am going to visit my bmw service for these delicant jobs
thanks