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Failed MOT on Gas, had to use petrol to get through emmissions

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Rossko:
Impossible to say whats going on without some more diagnostics.

I hope this is a closed-loop system, even if it is single point - i.e. stepper motor in the gas feed hose.   If so, the next step would be to hook a laptop up to the gas ECU and see what it thinks.

If its an open-loop system you're on a hiding to nothing, hopelessly unsuitable.  ( whereas a closed loop is just plain unsuitable  ;) )

More than likely it's a tired vaporiser, they tend to go rich at idle with age but perform okay under power.   

cheers, Ross K

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