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Old 02-01-2011, 14:26   #1 (permalink)
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2005 F150 5.4 sparkplug replacement

I have a 2005 F150 with the 5.4 engine. I am aware of the issues with plugs breaking when removed. From what I understand, there is a better chance of breaking them if you wait the full 100,000 miles. So with that in mind I will be changing mine now, at around 70,000 thinking I may have better luck. Are there any tricks I should know, and what plugs have you guys used as replacements from original ??
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Old 02-01-2011, 14:40   #2 (permalink)
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Re: 5.4 sparkplug replacement

I did mine at 80,000 miles and didn't break any. I ran GM top engine cleaner through the intake small hose 3 times. 1/3 of the can one day, let it cool, ran another 1/3 and once more the next day. Then when the engine was still a little warm I loosened the plugs 1/8 turn and sprayed PB blaster down the holes. After 15 min., I removed them slowly sometimes turning them back and forth. If you hear a kind of rubbing sound, then you're alright. If no noise, you may have a broken end. I put the original type in but Champion makes a one piece plug. I'm not fond of Champions so I went with the original. If one breaks, the best tool is the Lisle #65600.
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Old 02-01-2011, 22:52   #3 (permalink)
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Re: 5.4 sparkplug replacement

we have the same problem here in oz with the 5.4 i have had them brake in three different cars.we used this motor in the falcons for awhile.


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Old 02-02-2011, 20:13   #4 (permalink)
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Re: 5.4 sparkplug replacement

Some guys have said they have had success running a couple tanks with Marvels Mystery Oil through the truck prior to doing a plug change. Here is someone's formula, run Marvels Mysery Oil in every tank for a month prior to changing the plugs, and use 6oz per every 10 gallons of gas. Some people have used a fuel system cleaner as well. You want to try and get the carbon build up to break down. It's the carbon build up that causes the plugs to seize up. Whatever you do, make sure you use Motorcraft plugs. Fords motors don't like other plugs very well. Once you get your new plugs in, document the milage, and change them more often. Good luck.

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Old 04-10-2012, 12:39   #5 (permalink)
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Re: 2005 F150 5.4 sparkplug replacement

Sorry it took so long to get back on here. So I tried the marvel mystery oil in a few tank fulls, gave all plugs a 1/8 inch turn, sprayed PB blaster in each one, let it sit for 15 minutes, and broke 4 of 8 plugs! But before I did anything I bought the removal tool so if I needed it, it was there. The tool actually works pretty well after getting a feel for it. Concidering what the shops charge for replacing the plugs, I am happy with the results !!!
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Old 04-10-2012, 15:11   #6 (permalink)
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Re: 2005 F150 5.4 sparkplug replacement

That sounds great. Thamks for the update.
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