Code PO304

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Dec 7, 2002 | 02:40 PM

wbandyjr

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From: webster

Code PO304

My truck is now shaking and back fired a couple times.I got it home and did the test and it was PO304 (cylinder 4 misfire detected) Does anyone know what i am looking at here? I am hoping it has something to do with the engine that is under warrenty by Fords extended plan..Any info would be greatly appreciated Thankyou much..

Dec 10, 2002 | 08:38 AM

fauxexplorer

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From: peekskill'ny

Code PO304

mine was wires,check wire connector on plug 4.i replaced them all.
let us know what u find

Dec 10, 2002 | 09:12 AM

wbandyjr

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From: webster

Code PO304

My friend who put the wires on for me didn't do a great job.One of the wires was on the EGR and exhaust and melted causuing the missfire.My mechanic recommended that i change the wires and use ford wires so i did..Ford gets $105 for the wires..I also had him clean the injectors too..The throtle body was cleaned about 6 months ago.