SoCalDesertRider wrote:
The V10 likes to rev. You likely need at least 4.88, 5.13 or 5.38 gears in that motorhome to truly take advantage of the V10's high rpm horsepower at the slower speeds motorhomes travel.
Ford's coil-on-plug ignition system was a bad design, included on the 4.6 and 5.4 V8's and 6.8 V10. Too much heat in a cramped engine compartment of vans and motorhomes kills the coils quickly.
I've got 80,000 miles on my old V10 without enough threads for the plugs. I did replace the plugs at 40,000 miles following a careful procedure from a Ford forum. I checked the torque on the replacement plugs 10,000 miles later and they were fine and they are running fine currently.
Never had a COP problem with the MH or a 2003 Explorer, 4.6, with 130,000 miles on it. Maybe Winny provided adequate air flow.