Spark plugs

Asked by Feb 25, 2016 at 10:26 AM about the 2003 Ford Focus ZX3

Question type: Maintenance & Repair

When I put the correct spark plugs in my 2003 ford
focus the car runs like crap plugs that are shorter
at the threaded end work better.  Why is this?

1 Answer

72,415

Are you getting the right spark plug? If it calls for a plug with a longer thread, why would you even put in a shorter plug? Also is the gap set correctly?

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