trouble code 304, 302

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Jul 4, 2012 | 12:57 AM

Kim Ouyang

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trouble code 304, 302

hi, everyone i am new to this forum, recently bought a f150 99 with 5.4, now i have trouble code 304,302, anyone have idea what this mean?? thankyou

Jul 4, 2012 | 10:28 AM

Ron W.

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From: Stockton Ca.

Misfire on cylinders 2 and 4, most likely plugs or coils. 2= second cylinder from the front 4 = rear cylinder, both passengers side.

Jul 5, 2012 | 09:32 PM

Kim Ouyang

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Quote:

Originally Posted by Ron W.

Misfire on cylinders 2 and 4, most likely plugs or coils. 2= second cylinder from the front 4 = rear cylinder, both passengers side.

thanks you , coil replaced problem gone, just wondering if that's normal i got 10 mpg out from my utragauge reading

Jul 6, 2012 | 05:43 PM

steve(ill)

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coil failures are common. i have 230k miles and have had about 8 failures in the past 10 years. I put a new set in at about 175 K miles, and 2-3 of them have failed. If your asking if 10 MPG is normal, that depends on your driving. Stop and go around town, or driving thru the corn field on the farm-- yes.. On the highway you will get 15 or better. I get 17 easy driving 60 MPH on state highway to work, no stops.