bmw 325i emissions

[swansea v6]

posted in bmw forum but no replies........ my 325i has failed the emissions test twice....fast idle co level was 2.3% at first then 1.2%C car has new thermostat, lambda sensor and cat, any ideas on what is causing such a high figure, pass should be 0.30%.........

[stevieturbo]

Dodgy cat ?

[Marquis_Rex]

A 325i could be anything from a 1986 2 valve M20 engined car to a later E36 or even E46, all of these cars have different emissions systems, fueling control etc etc, so "325i" is more than a little vague....

[swansea v6]

sorry. it is a 1994, E36 325i coupe, if thats anymore help

[Tony427]

Faulty engine temperature sender, thinks engine is either always cold and chucks too much fuel in or thinks engine is too hot and chucks too much fuel in to compensate...I had this problem.....Have you cleaned the injectors which can also stick causing overfueling.

A trick told to me by a BMW specialist was that if they get a borderline emissions result they put a full bottle of injector cleaner in half or less of a tank of juice and then thrape the car for a half hour or so both to clean the injectors and to burn off any residue.........they tell me its always worked so far.

Cheers,

Tony

[swansea v6]

finally managed to get it passed!!!!!!! put a bottle of forte injector cleaner and took her for a 45 mile blast down the M4 not using 5th gear......... and it flew the emissions test...cheers forte..