Question about 2001 Ford Focus

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No.1 cylinder is misfirering

1 week ago brought a higher grade of gas,the next day after i brought the gas the engine lite came on.I drove the gas out and the lite went out,filled up the tank with 87oct ,The lite came back on 2hrs later.

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I have known some cars, ford in particular, to shed carbon from the piston top periodically, like peeling paint. some of this can get stuck under a valve seat with resulting loss of compression. i do not know why this happens. alternatively, town running deposits which used to be very common still occur sometimes. soft carbon deposits created on the spark plug during low speed (town) driving can become baked on rendering the spark plug useless if the engine speed/load is increased too quickly instead of being burned off which usually happens.

Posted on Oct 05, 2008

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