ol' yeller wrote:
Fla904 wrote:
Grit dog wrote:
If you are missing on 3-4 cyl, the truck will barely run. Maybe the cause of dieing at an idle.
Idk man but $6-800 for 10 coils and plugs is a good deal, but I'd question needing to replace all the coil packs. Besides which is it? 6 or 8? Any mechanic that can't give you an exact quote after diagnostics is not sure himself.
Well he quoted me on if I did it with plugs or just coils. Figured I would just replace everything to avoid the problem in the future. Also it's not misfiring right now the computer he hooked up said it was misfiring in the past at some point. Am I risking further damage if I don't replace these things? Is a missfire bad for the engine?
Yes a misfire is bad for the engine. Typically it means that the fuel is not delivered when the spark is which means raw gas could be washing down your cylinder walls and diluting your oil.
On your year V10, 1998, I adhere to those who advocate to change plugs around 70-75K miles, not the 100K miles Ford recommends. The coils sit in a metal well that drops straight down in the head about 3 inches. They are protected by a rubber boot. Over time the heat from the engine causes the rubber boots to crack and deteriorate which allows moisture and dirt to go where it does bad things to a coil. Plug replacement allows inspection of the boots and coils. Most coil manufacturers supply new rubber boots with their coils but not all. I would replace your plugs, all the boots and the defective coils. As long as I'm spending your money, I'd also probably buy an extra coil for a spare. Here is a link to a forum where I have gained a ton of knowledge about my old 1999 V10 as well as the new one in my 2008 E450 RV. It is the Ford Truck Enthusiasts website.
X2. Good advice. No need to replace all those coils. Replace plugs, boots and the two coils that miss fired. Less than $150 bucks if you do yourself. Loved my 2000 V10 Excursion.
