2007 Ford F150 5.4lt 4WD - 2CoolFishing
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Old 11-03-2018, 05:26 PM   #1
Cozumel Annie
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2007 Ford F150 5.4lt 4WD

Bought a rebuilt engine from Thunderbolt about 2 years ago and to date I've only put about 750 miles on it. I crank if over at least once a week and drive and once per month drive to the farm. Yesterday at idle after driving for a few minutes I noticed it was idling rough like it was misfiring? Engine light came on soon after so I plugged it in and received the following code: P0303. Looked that up and my gut told me I was right, but there were several other options dealing with O2 sensor, coils, catalytic converter, etc.... I had a half a tank of gas so filled up with 93 octane put in a fuel additive and the problem went away, but light still on. Disconnected battery to reset engine light. My question is do you think it's OK to drive for a bit to see what happens? Do you think I'm going to cause more issues?

Thanks for any advice or help you can give. Thank you.
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Old 11-04-2018, 07:02 AM   #2
bwguardian
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The sensors are probably originals. It needs to be driven and put through heat cycles. I would pull the O2 sensor, clean, and re-install and see what happens after driven a bit.
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Old 11-04-2018, 11:26 AM   #3
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It started doing it again.
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Old 12-01-2018, 08:36 AM   #4
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Ignition coils are a very common problem for that engine. Not saying to throw parts at it without diagnosing the cause, but the code 303 means that #3 cylinder was miss firing.


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