Question about 2000 Ford F150 Flareside SuperCab

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My 2000 f150 4x4 runs rich, miss fires and only gets 10 mpg city and highway. I've replaced all spark plugs and plug coils.

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Adjust valves or mite have a blown valve

Posted on Aug 04, 2010

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I would start by pulling a spark plug and looking at condition. With that kind of mileage, has it ever had a valve job? Valve's burn and valve springs get weak, could have a carbon problem. Also compare the brands of fuel you're using, many have changed their formulas - I've noticed it with my own cars. Also have your mechanic do a compression test.

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When there is an engine misfire it could be gas or spark related. Or, the oxygen sensor may not be operating correctly, which controls fuel supply.

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I recently checked brought my car to the local


There are 6 coils that fire the spark plugs. You only need to replace the coils that are misfiring. Some autoparts stores will let you use a diagnostic meter for free. The code will tell you which cylinder is misfiring and the autoparts store can tell you the firing order so you can locate which cylinder & coil.
Unless your car is due for a tune up I would just replace the faulty coil and not the spark plugs. Dealer will always recommend replacing all the coils. Eventually another coil may fail but who knows when that will be. When you notice the symptom again just tackle it as you did this one.

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