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daxelson
 Post subject: misfire cyl 3 p0303
PostPosted: Sun Feb 03, 2008 6:38 pm 
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Posts: 2
I have a ford f150 with a 4.6l. code reader tells misfire in 1 and 3 replaced all plugs, went to misfire in 3. checked wire for 3, looks good has resistance, checked coil, testing to specs acording to my repair manual. what else can i check?
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 Post subject: misfire cyl 3 p0303 
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jeff compton
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PostPosted: Mon Feb 04, 2008 8:38 am 
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An ohms test on an ignition wire is pretty hit and miss, install good quality ignition wires and continue checking the rest of the options!
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daxelson
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PostPosted: Mon Feb 04, 2008 9:20 pm 
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I got about 1 yr/20000 mi on these plugs and wires, put new autolite xp iridium plugs in according to oriley parts guy is what book calls for. the old plug in number 3 had ceramic broken around eletrode but no other damage to it

just did a visual spark check, saw arc from number 1 but not 3, fixed that, pulled 1 and 3 plugs, everything looked good, swaped fuel injectors 1 and 3, erased codes, took it for a drive got same p0303 code
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wyldemannn
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PostPosted: Tue Feb 05, 2008 8:21 am 
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got compression numbers yet?
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