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What can cause my 99 1.6 petrol to run rich thanks
Do you smell petrol in the car and what is the rpm at idle? also has your mpg dropped at all?
I can smell petrol some times .mpg is ok
My rpm is about 750 gust billow the white mark
Could be a leaking gasket as to the reason you are smelling the petrol, plus the fact that it may also be sensing more air in the engine so overfuelling.

check the gaskets around the sparkies and replace any as necessary, this has worked for some people.
Will it be the o2 sensor
The o2 sensor could be faulty causing an overread which could be causing it to overfuel!

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