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Failed emissions MOT Ford cougar 2.0l?

My 2000 (V plate) Ford cougar 2.0L zetec failed its mot today on Exhaust emissions.
My readings are as follows

Fast idle test
co = 0.21% = pass (max 0.30%)
hc = 36 ppm = pass (max 200)

Natural idle test
co = 0.54% = Fail (max 0.50%)

the car had a new cat fitted around 6months ago along with new ht leads.

Any idea's to get that 0.04% drop in idle would be great!

David
January 2010
i was thinkn about trying that will pop down to halfords in the morning and get some i think then give ita a good old thrash down the road before getting it retested.

Dave
January 2010
try some "wynns clean burn" in the petrol tank . it worked for me!.

sid
January 2010
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