Missing Cylinder #8
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Junior Member
Joined: Jan 2006
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From: Ohio
Missing Cylinder #8
I have a 2001 Supercrew with a 4.6 V8. I have had some missing when under load. I checked the codes and I have a a cylinder #8 misfire. And later if became a mulit misfires.
I have found this model has coils on each plug. I plan to replace the plugs. should I also replace the coilfor each plug or just the one missing. Also should I replace the short wire on each plug?
I have found this model has coils on each plug. I plan to replace the plugs. should I also replace the coilfor each plug or just the one missing. Also should I replace the short wire on each plug?
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Joined: Aug 2002
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I have the same problem with mine except cylinder 3. I am going to start with the plug. If that doesnt work I am changing the wire then the coil. I figure thats the cheapest way. Maybe I will luck up and it be the plug.
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Junior Member
Joined: Jan 2006
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From: Ohio
Coil packs?
This may sound lame but I do not think my truck has the same type of coil pack youare refering to. I researched information on my truck and found that each plug has a coil on top of it. Or am I wrong?
Senior Member
Joined: Sep 2003
Posts: 3,053
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From: Aggieland, TX
1st, I dont think he needs to worry about the firing order, its a little bit harder to screw that up on these engines.
Next up, Ive never heard of this coil packs running in pairs thing...much one coil pack killing its "pair"
I would say replace the plug (or all 8 if you want), and if that doesnt fix it, you can simple try swapping the #8 coil around to see if the misfire moves with it. If it does, you know you have a bad coil pack.
Next up, Ive never heard of this coil packs running in pairs thing...much one coil pack killing its "pair"
I would say replace the plug (or all 8 if you want), and if that doesnt fix it, you can simple try swapping the #8 coil around to see if the misfire moves with it. If it does, you know you have a bad coil pack.
Senior Member
Joined: Oct 2002
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From: St. Louis (Out in the woods)
It is virtually impossible to screw up the firing order on a 5.4. The wiring harness simply won't allow it as each plug has its own individual coil.
The 4.6 uses two coil packs, each of which has two primary coil inputs. Each side of each coil secondary is connected to a spark plug via a wire. Both plugs on each coil fire at the same time: One is on a compression stroke while the other is on the exhaust stroke. The firing order on the 4.6 is irrelevent as far as installing plugs wires (this ain't a distributor...). What is vitally important is that the correct coil is connected to the correct two spark plugs. FWIW, they can be reversed and the engine will still run fine - try it if you're bored.
This thread shows the hazard of 1) jumping into someone else's thread and 2) failing to properly identify the engine you're asking about.
Steve
The 4.6 uses two coil packs, each of which has two primary coil inputs. Each side of each coil secondary is connected to a spark plug via a wire. Both plugs on each coil fire at the same time: One is on a compression stroke while the other is on the exhaust stroke. The firing order on the 4.6 is irrelevent as far as installing plugs wires (this ain't a distributor...). What is vitally important is that the correct coil is connected to the correct two spark plugs. FWIW, they can be reversed and the engine will still run fine - try it if you're bored.
This thread shows the hazard of 1) jumping into someone else's thread and 2) failing to properly identify the engine you're asking about.
Steve