Spark Plug question for Ford F-150 4.6L

[ford4wd08]

Your are in luck. I changed my on the same engine two months ago. Stick with motorcraft, they aren't that expensive and they're good plugs. If you have a misfire make sure it isn't a coil as well. I had one COP go bad on cylinder 5 at 145000 miles, but it was a very easy fix. The plugs really arent that bad to change on this engine. Took about a hour and a half. You have to get a little creative sometimes, but as long as you have a few different sizes of extensions and a u joint you'll be fine. Just get a step ladder, if they're hard to get to on mine, I can't imagine yours!

 

[Darth Bama]

Re: Spark Plugs

Stay with the Motorcraft plugs, trust me.

 

[Fordfanatic101]

Stay with Motorcraft I picked all 8 up at auto zone for $12. I had them changed out in less than an hour. Just pull the fuel rails and you have direct access to all of the plugs and COPs. The back two plugs, I think were the only ones that needed a swivel socket but that was it.

Also Torque them down to 28Ft lbs and put dielectric grease in the cop boots

 

[ProZach]

motorcraft for sure.
the 5.4 tritons were the only ones listed on the TSBs for plugs breaking IIRC

 

[ford4wd08]

You don't have to remove fuel rails..... I didn't, didn't think it was necessary, just another opportunity for me to screw something up lol

 

[Fordfanatic101]

You don't have to remove fuel rails..... I didn't, didn't think it was necessary, just another opportunity for me to screw something up lol

It will make the process a lot easier it two bolts per rail, then they just pop off. There is really nothing you can screw up.

 

[bigredstx]

Spark plugs done! Didn't move the rails just used a lot of extensions, holy fWonk is was tight though. My whole body hurts from climbing over in it so high off the ground


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[ford4wd08]

Spark plugs done! Didn't move the rails just used a lot of extensions, holy fWonk is was tight though. My whole body hurts from climbing over in it so high off the ground


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Haha I felt the exact same way. Glad to hear you got it done!

 

[bigredstx]

The old plugs were completely fried, nearly double the gap. The truck is running better than it has on a while, and my OD mis fires have disappeared


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[PenguinLTZ]

Nice!