16V Lysholm Failed mot emissions

[flusted 0]

My 16v lysholm just failed mot on co.

It was 4.2 and kept climbing at 1 point.

 

Can this be adjusted on the co pot? co pot currently set to 500 ohms or is it down to the chip and the fact im running 440cc lime greens?

 

Thanks in advance

[Rustynuts 0]

Was the chip designed to run 440cc injectors? If not it is overfueling and therefore too much co

[flusted 0]

yes chip written for spec

[Rustynuts 0]

If it's not the co pot it could be the lambda sensor kaput, or bad earth, the usual G60 things for it to run rich really. Doubt it will be the chip if it has been designed to run that spec, but I guess check the usual suspects first before blaming it on the chip.

[flusted 0]

Ive done all the earths, added extra earths etc, new BTS Tested lambda and was ok

[Rustynuts 0]

Are the plugs black? I guess they will be with that co reading.

 

BTS could still be faulty, have heard 'new' ones especially none VAG ones not always being the best.

 

Another thing, and this may be a daft one, but is your 1m vac pipe that runs to the ECU on the correct nipple on the back of the throttle, if it is one the wrong on it will be reading permenant boost and therefore overfuelling.

[flusted 0]

Thanks for all advice so far, yes pipe exactly 1m on correct nipple and new vag BTS will check plugs soon

[Rustynuts 0]

Right well thats me run out of talent, only thing I can now think of is knock sensor or timing.

[flusted 0]

Bump can the co really drop from 4.5 to 3.5 with co pot adjustment?

[W3RKD 0]

Did you not try to adjust it when carrying out the MOT ? 500ohms is a base setting for a std car running stock injectors not a modified engine on 440's mate.Get it back on the emmisions machine and get winding the co pot once you have checked the ignition timing is correct

[flusted 0]

It was a new mot tester and i dont think he appreciated the mods to my car lol. Il get it checked at my mates garage

 

Thanks daz

[paul20v 0]

It was a new mot tester and i dont think he appreciated the mods to my car lol. Il get it checked at my mates garage

 

Thanks daz

its the machine that decides the results not the tester so it should have made no difference to the tester mate.

[flusted 0]

what i ment was i dont think he would of been prepared for me to start fiddling under the bonnet to try and adjust it