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Old 01-31-2012, 22:40   #1 (permalink)
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03 f150 5.4 cost efficient upgrade ideas

Hi I have a 2003 f150 super cab xlt 4x4 with 166xxx miles on it. It keeps missing on the 1st cylinder on startup giving me codes p0301 and p0316, ive replaced the plug and coil and the injector. So im afraid ive got a burnt valve. My question is since im gonna have the head off anyway im thinking about some upgrades. I do alot of hauling my horses and hay so does anyone have any ideas to give me a little extra power and still stay in a smaller budget? Also do you think I should just go ahead and do a complete rebuild job on it or just leave the bottom end alone? Thank you in advance for your input!
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Old 02-01-2012, 07:24   #2 (permalink)
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Re: 03 f150 5.4 cost efficient upgrade ideas

Have you checked the compression to see what you have?
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Old 02-01-2012, 21:56   #3 (permalink)
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Re: 03 f150 5.4 cost efficient upgrade ideas

i plan on doing a compression test this weekend, but from what ive figured out a burnt valve seems to be the last option.
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Old 02-02-2012, 07:36   #4 (permalink)
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Re: 03 f150 5.4 cost efficient upgrade ideas

If the cam wore or has a defect, it may not open a valve.
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Old 02-03-2012, 21:54   #5 (permalink)
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Re: 03 f150 5.4 cost efficient upgrade ideas

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If the cam wore or has a defect, it may not open a valve.
I suppose that is possible also but wouldnt it make it miss all the time? when i forst start it im hearing a bit of a tick on the passenger side of the motor now. A friend of mine said it could be that when it warms up the metal is expanding causing the valve to function properly because when it warms up the tick goes away and it stops missing.... its frustrating lol ive only had the truck since october.
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Old 02-04-2012, 13:20   #6 (permalink)
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Re: 03 f150 5.4 cost efficient upgrade ideas

Could it be a sticking valve lifter ?
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Old 02-04-2012, 14:56   #7 (permalink)
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Re: 03 f150 5.4 cost efficient upgrade ideas

im gonna do an oil change this weekend so i dumped some seafoam in the oil to try to free it up if it is something sticking.
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Old 02-05-2012, 17:08   #8 (permalink)
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Re: 03 f150 5.4 cost efficient upgrade ideas

the tick sounds like you may have a exhaust leak and will have to change exhaust manifold
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