is this a mk2 punto or a mk1 punto 60?
if its a mk2 most testers dont do the fast idle test because the engine
will not hold well in the required range, this is because the engine is
not under load.
if its a mk1, bang a lambda sensor on there.
a coil wont make any difference in co.
btw where did you get a reading of 50 co from, 50 what?
every machine ive ever used measures co as a percent.
like 0.5%

Hi

Thanks for reply.

This is a mk2 punto.

The co figure is for the fast idle test the figure was 0.51%.

This is the only area the car failed, as you know the fast idle speed is
between 2500-3000Rpm anything above this and the co% drops dramatically.

I heard that sometimes mk2 punto's have to have emmisions tested on a
slope not sure what difference this makes though.

I have just phoned the mot station that failed my car and suggested that
the fast idle emissions test is not usually carried out on mk2 puntos the
response was that it makes up the mot test and therefore must be conducted
for the mot to be legitimate.

Im not sure of my legal standing here can anyone help??