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| Member |
I've had an onging battle with the coil packs for the last few years and I've probably replaced 5-6 of them. I get one taken care of and then a month or so later another one starts acting up. Going back to the shop again on Thursday. | |||
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| Little ray of sunshine  |
We have that engine in an Expedition, and despite my earlier smart ass answer, we had to replace some coils. The fish is mute, expressionless. The fish doesn't think because the fish knows everything. | |||
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| Member |
You need a new mechanic. The Camshaft position sensors are definately NOT an engine teardown to fix. They come right out the front of the timing cover. On the 5.4 the book says remove the inlet tube but that's it. The VCT Solenoid comes out the top of the valve covers. Again, not much comes off the engine. If you have the 5.4L 3 valve motor and your Cam Phasers failed (which happens with moderate frequency) you will have VCT issues, but you will normally also be able to hear a rattle from the front of one or both heads as the cam sprocket is loose. Replacing those is a little more complicated but you still only need to take the front cover off the engine. Hardly a teardown. You should see what exactly they are doing. As for Mike's truck, he didn't say what engine he had, but the whole VCT thing is really only an issue in the 5.4. The 4.6 2-valve Mod Motor doesn't have variable cam timing. With those motors, and that mileage, it's almost certainly the coil packs. Especially since it's humidity dependent and clears up once the engine get's hot enough to dry out. | |||
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semi-reformed sailor |
It's the 5.4 Triton engine... thanks for the info so far guys! "Violence, naked force, has settled more issues in history than has any other factor.” Robert A. Heinlein “You may beat me, but you will never win.” sigmonkey-2020 “A single round of buckshot to the torso almost always results in an immediate change of behavior.” Chris Baker | |||
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| Member |
This is 99+% coils. you need a good scanner and as DEC505 says look at the power readings and misfire data it will tell you right away which one(s). “So in war, the way is to avoid what is strong, and strike at what is weak.” | |||
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Be Careful What You Wish For... |
Thank you for the info. The dealer has the truck at the moment. It's being fixed under warranty, so at least there's that. LOL ____________________________________________________________ Georgeair: "...looking around my house this morning, it's not easily defended for long by two people in the event of real anarchy. The entryways might be slick for the latecomers though...." | |||
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Assault Accountant |
I’ve replaced the #7 and #2 ignition coils on my 2003 F150 FX4 over the course of the past few years. Both times were after experiencing similar rough idling and driving. Two down six to go.  Edited to add that if you have an Autozone nearby, they will run diagnostics for free while your truck is in their parking lot and will tell you which cylinder is throwing the code. __________________ Member NRA Member NYSRPA | |||
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Shorted to Atmosphere |
I’m in the coil camp too. Many times the rear most coil on the passenger side can have coolant leaking onto it and getting down into the spark plug hole. A good scanner will help determine the misfiring cylinder. I can also determine a misfiring cylinder by using my Fluke 88 and RPM clamp. | |||
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| Member |
It is worth adding that just sitting a parking lot with a scanner (the autozone idea) is unlikely to get a good read on this. just from experience. If it does great, but most likely you and the scanner need to go for a ride. FWIW> “So in war, the way is to avoid what is strong, and strike at what is weak.” | |||
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I run trains! |
Good info on the VCT solenoid, I suspect my 2005 just started having this issue. Success always occurs in private, and failure in full view. Complacency sucks… | |||
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| Just because you can, doesn't mean you should |
Since you just had the plugs replaces, start with the basics. Check that each plug wire has been put back on all the way. ___________________________ Avoid buying ChiCom/CCP products whenever possible. | |||
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| St. Vitus Dance Instructor  |
If it should be a coil pack, replace all of them at once, pretty easy to do. Youtube has videos on this. When one goes, another one is ready to go also. Don't ask how I know this. I got mine from Rock Auto. | |||
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