Question about 2000 Ford Taurus

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Code says #5 is misfiring.

Light does go out but usually comes back on within less than a day. Now it sometimes flashes when it first comes on. It had a tune-up and fuel injectors cleaned , etc. in Ohio. THen I drove it thru Denver and put 85 octane in it- acouple of tanks. When I got to Las Vegas it started running rough and the light came on. I am now in San Diego and I have put fuel system cleaner in it but the light comes back and it runs a little rougher than it ever did before on idle.Which spark plug is #5. It is a 3.0L flex fuel engine. 2001 ford taurus

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You have 1. A bad injector, which is about to break up and damage your engine or a coil or spark plug wire going bad. Or broke or you have lost compression in that cylinder so first I would do a compression check to see if compression is ok if it is then test the injector and or replace and check for intake leaks around the intake near that cylinder by spraying a small amount of WD 40 around the intake to see if it smoothes out if it does you have an intake leak take it to someone who can do it if your not sure how. and Please rate my answer. thaks Avid101

Posted on Jul 30, 2009

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Check the O2 sensor and the air filter too. Clean it out thoroughly. Start the engine and feed petrol directly to the pump. Use good clean fuel and see how rough the engine is. Also check the #5 cable for physical damage. If the engine runs smoothly now, then before putting the fuel line, clean the fuel filter too.............sodeep

Posted on Jul 30, 2009

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