Emissions problem! HELP please!

[nissan_silvia_s15]

well guys ive recently purchased a red 2000 spec R s15, but I am having problems getting her through the NCT (Ireland),

Low Idle - CO was 4.8% it has to be 0.5% or less
High Idle - CO was 9.77% it has to be 0.3% or less
HC - 336 ppm - it has to be 200ppm or less
Lamda 0.75 - it has to be between 0.97 and 1.03

any ideas lads???

 

[shane_o]

nice and rich lol. lambda sensors are common but thats quite drastic. may be looking at some sensors too, has a cat im taking it?

 

[nissan_silvia_s15]

well that was before two coils got replaced and the dump valve was leaking air so im not sure? could that contribute to the emissions??

 

[S15_SAM]

Take the catalytic converter (cat) off and check its ok, if it is then replace the 02 sensor, if its not those then check your MAF sensor is working and then inlet manifold for air leaks. Can't really be much else after that!