Plug wires
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Note he's got 170k... I'm nearly at 200K. I have read numerous posts of guys with faulty coils at less than half either of our mileage. And note I said if he's got the money he could replace them all, not that it was necessity.
Finding a bad one is not easy on a V10. Easy is putting a oscilloscope pick-up on a coil and a pick-up on a spark plug wire and running at load, the way we use to do it before all the electronics. Can't do the same now as there are 10 separate coils with 10 separate signals not regularly monitored by the computer.
BTW, when I removed the plugs/boots/coils at 190K I found no appreciable wear/tear on the components in question (they had never been off the engine in 10years 190K). I suspect the culprit in boot damage is more related to people tearing component parts apart, ie, swapping coils around trying to find a faulty one!
Finding a bad one is not easy on a V10. Easy is putting a oscilloscope pick-up on a coil and a pick-up on a spark plug wire and running at load, the way we use to do it before all the electronics. Can't do the same now as there are 10 separate coils with 10 separate signals not regularly monitored by the computer.
BTW, when I removed the plugs/boots/coils at 190K I found no appreciable wear/tear on the components in question (they had never been off the engine in 10years 190K). I suspect the culprit in boot damage is more related to people tearing component parts apart, ie, swapping coils around trying to find a faulty one!
Laughing Gas
Joined: Sep 2012
Posts: 880
Likes: 13
From: Northcentral Wisconsin
If it's running good, chances are it's because of winter fuel and increased idling from the cold temperatures. Depends where you live. Otherwise, start with what the other guys recommended.
Lead Driver
Joined: Mar 2013
Posts: 7,460
Likes: 85
From: Kent Station, WA
When I purchased my truck at 126K I changed the plugs. After the plug change only one coil pack was bad. I now have 9 original coil packs.
There is no reason to replace them all, unlesss they have failed.
There is no reason to replace them all, unlesss they have failed.
Junior User
Joined: Oct 2014
Posts: 96
Likes: 1
On the one hand my Ex has had little-no issue until recently in the 190K range so I find the posts with guys having problems in the 50K-100 intriguing. On the other hand having 200K on the truck components and thinking they're all OK for another 200K is laughable in my mind.
I'll have to dive under the hood soon on my Ex to chase down the bad coil as mpg has dropped from 14/15 non-pull to 10/11 now. And no it's not gas quality. Our blends don't get nearly as weird as those used way north. It's definitely a bad coil(s).
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