You are watching: 2002 ford f150 spark plug change

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Posts: 9925 Joined: Fri May 25, 2001 5:00 pmTruck: 2003 F-150 King Ranch SuperCrew 4x4Location: CanadaMy Truck ModsContact:


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https://amzn.to/1VwDSw5Torque plugs to at least 20 lb-ft: There are varying schools of thoughts on this one. The consensus seems to be though that the factory spec (approx 13-14 lb-ft) for the spark plug is too low which causes the plugs to loosen over time and evenually spit out of the engine. FordTechMakuloco recommends 20-25 lb-ft and others swear by 28 lb-ft. In my opinion anything over 20 lb-ft is good because you"re already 50% higher than the factory spec. I installed between 20-25 on mine. None of the factory plugs were loose with 110K miles on the engine with original plugs. For the record, the factory Ford shop manual torque spec for spark plugs is 9-20 Nm or 78-176 lb-in (pound inches not pound feet).Spark plugs: please only use Motorcraft plugs. There are "fancier" spark plugs on the market but these engines seem to run best with Motorcraft plugs so do yourself and favor and stick with them. The ones I used were the Motorcraft SP479Coils (COPs): The best coils to use if you need to replace one is Motorcraft, but they are very expensive. Beware cheapo aftermarket ones as most of them will not last like Ford/Motorcraft. Personally I would not recommend replacing all 8 coils just because you"re changing plugs, they"re not really a maintenance item like plugs are. Yeah they do wear out and fail but I would recommend you find the one coil that"s failed and replace it individually with a high quality part such as Motorcraft DG508Spark plug boots: If you find a cracked or split boot down where it meets the plug, you should try replacing just the boot instead of the coil. The boots come off and they"re like $5 so try that first to see if it resolves any misfire you might be having. I suspect a lot of people would condemn the whole coil if they saw the split boot. The boot is cheap and easy to replace. Also, put a little dielectric grease in the end of the boot when re-installing. It"s not necessary to fill up the end of the boot, just a nice moderate amount is all that"s needed.Start with: some folks suggest to start by doing the hard plugs first, I say start with the easy ones first so you get a feel for the process. I actually changed the plugs in order from 1 through 8, maybe I"m OCD
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As you can see, spark plug #1"s electrode is worn down but the rest are actually pretty good. I think the #1 issue was due to an exhaust leak. When I bought the truck it was leaking from the front of that exhaust manifold (one broken stud) and I don"t know how long it was like that. I"ve since had that fixed.I had one plug that wasn"t coming out nicely (#4). There was major resistance when I was unscrewing it. If you find that, stop. Run the plug back down tight, then loosen it about 1/4 turn. Put in 1/2 teaspoon of carb cleaner and let it soak (ideally overnight). I did that and then I worked it back and forth the next day and got it out no problem. I believe what happened was there was some carbon deposits built up on the plug threads that were sticking into the combustion chamber. Do not use PB Blaster, use carb cleaner or Ford"s own version PM-3 https://amzn.to/1Hlkh6D as that will soften/loosen the deposits.One side, then the other: I read this tip before I did my plug change. Someone said to do one bank, then start the engine to make sure everything is good before doing the other side. I would actually say don"t do that as starting it heats up the engine, heads, etc. Leave the engine cold, do them all, and if there is a problem when you"re done, deal with it then.If you have tips I have not listed here that would be helpful to 2 valve Triton engine owners who are looking to change their plugs, please post below. I am by no means the expert on spark plugs but I read a lot of misinformation out there before tackling the plugs on my F-150.p.s. As an aside, the shorty ratchet I bought is a Snap-On FK80, it worked great back on #4. I find myself using it more than my longer ratchets now. Check it out