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Can be somewhat tricky question. I have hesitation, not me my F250 99 LD, when press gas pedal at high speed and sometime when just started driving in cold. It is not so much of miss to throw code. Now I can see the ground of both coil packs is rusted. I Checked voltage drop from positive post at battery to ground of coil pack where is red arrow in photo. It shows 14V with truck running where is between battery posts 14,8V with car running. Is it 0.8 V of drop enough for calling cleaning of coil pack ground? Another problem with it is that the ground is square and has some surface. What if I put lead of voltmeter at some other point? Now I think I will get some small L profile metal and put it on the ground beside coil pack, like that blue line and then read the voltage drop. Would it give me a reading of the average drop of that area? Replaced air filter but it didn't solve problem. The problem is not big and can wait till spring but I like to do diagnostics. Follow ScanerDanner and South Main Auto on youtube. When we are at it can I buy scanner app for my android phone just for my truck and small car? I do not have money for Snap-on scanners.
The coil packs don't use engine or chassis ground for anything except mechanical mounting. Rabbit trail.
Probably just needs a tuneup: Plugs and wires (assuming 4.2 or 4.6).
Get a decent OBDII BT adapter and Torque Lite for Android.
Hardly anybody has money for a Snap-On, that's why they offer credit. Probably make as much money off financing as they do from the gear. Really good stuff, great service, quite pricey but worth it to the guys who make their living off that gear.
Open that I'm wrong but did it once or twice since I own truck and it worked. Did tread about it and it disappeared, probably automatically deleted. Actually, I remember back then someone on the internet recommended cleaning coil pack ground if hesitations exist and hence I did it in the first place. Edit because video do not show up in you write in search box at youtube
How to Clean Coil Pack Ground Plate on a 95 Ford Explorer
Well, I've been having intermittent missing and my engine wouldn't run all that smooth and would have vibration. Well, I saw a video about checking for corrosion on the grounding plate as well as the contact on the coil pack on the 4.0 OHV. Well, you wouldn't believe it what I saw when I pulled the coil pack off. I swear the only thing grounding the coil pack was the screws. There was a band of rust around the entire mating surface of the coil pack and none of the metal was smooth and shiny. Well I hit it with some sandpaper, degreased, and reassembled. I absolutely couldn't believe what I heard when I started it up. The engine that used to send vibrations that you could feel in the drivers seat is running smooth enough to balance a quarter on it! I'm not saying that this is a miracle fix. As a matter of fact it is really just a simple problem and solution. There was a confined space with bare metal that rusted. The rust inhibited the electrical properties, and when it was cleaned, the properties were restored.
So GO CHECK YOUR COIL PACK! It can't hurt and it sure as heck helped in my case.
Yeah look like you are right. Boy it is strange.
----------------------------------------------------------------------- I think you're right, JC & KPT. The secondary (high voltage)circuit completes through the 2 spark plugs and coils. The primary (12v) circuit completes through the single power wire and the three grounding wires from the PCM. If the coil(s) were grounded any other way they would be shorted and wouldn't fire.
There's probably a stray magnetic field generated around the coil pack which might be absorbed through the coil baseplate. Maybe that's why the engines run better when that baseplate is cleaned and better grounded...?
--------------------------------------------------------------------------------------------------- https://www.explorerforum.com/forums...r-rust.373394/
I am a licensed Electrical Engineer. So it is an educated guess... Every shield needs a drain to common electrode (ground) to be effective.
Of course I have no Faraday cages to enclose an Explorer to prove you that I am right. But FCC requires all kind of similar tests. Even if your radio might still "work" it might be above the limits allowed for auto certification. Try AM band.
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Again it is some ground.
This problem is solved when truck, finally after 6 months on off misfire, throw the code. It was cylinder 8 misfire. I replaced spark plug wire and everything work fine. Strange is when I pulled old wire out like 4" of electrical tape, that is used to wrap wire loom, show up. Somehow that tape fell in spark plug hole or before or just when I did this replacement. I checked the old wire with ohms but it didn't prove it is bad even after shaking.
Again, same problem. This time Sunday 8 days ago it started missing again. Not on off situation just missing all time. I put the truck at parking as I work 32 miles away so I drive with my Acura tl 08 there after I unloaded tools there. This Monday started pickup and like 1 mile away code is thrown. Again cylinder 8. Will go with testing again how much I can. And Monday night it snowed for a while. I should go pick up tools and go to another project. In this case I'm losing money for the difference of January when I seated at home. Because it didn't throw code last time for months, I wasn't sure it wouldd throw code this time. If I knew I would have code right away I would try to drive around before Monday.
I have a hint about what could be. We had heavy rain for the last 3 weeks or so. May be water sipping in. Will check with light and mirror. Hood is little of and my allow water sipping in. I conclude from some comments at Internet that I sawed to a file.
First pressed in wire at spark plug nr 8 but then pulled out wire and set back at spark plug and all good, no more misfire. How much I sow wires bottom is not brown or wet, so no water there. But the top of the spark plug looks dirty somewhat. Looks like dielectric grease that I put at edges of spark plug wire get at spark plug top. Probably I will clean it one day.
A few days after my last comment on 10/31 I had code again. Finally used my compressor and blow dirt out of spark plug hole nr8. It was a lot there. Truck is running like champ since. I did it on Saturday and drove 120 miles so far and all good. This problem has been lingering for 16 months or so on and off and all that I had to do was blow air into spark plug hole.
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