Took my 90 2wd Saph in for MOT and it failed on emissions on CO level

Results were CO 6.36% (3.5% Max) Hydrocarbons 516ppm (1200ppm Max)

Car is running a Colins stage 1 Chip and 1 bar boost and has new ACT and ECT sensors

What's the best way to go about solving this?
Simple CO adjustment? MAP sensor? fuel pressure/regulator?......

Cheers

Gordie

 

you will need access to a co meter. and then what could do is adjust the co by turning the adjust screw on the ecu to get the level down. if it doesnt drop you may have a problem elsewere.
but MOST important put the adjust screw back exactly to where it was by the same amount of turns and co level.
this is just in case it was there for a reason although it should not be that high for idle .if your not happy with this level get it checked out by a tunning specilist

 

diagnostics check mate, shouldn't be that bad if it's set up right. faulty sensor somewhere.