Worn spark plugs power loss if there's no misfire?

[rfoll]

I have a friend that experienced something similar in a Ford Aerostar. Well over 100K on the plugs, and the straps completely burned off. It was running fine.

[Firedome8]

The Ion sense function can be effected by plug type and mileage.

[DanE1]

My wife's 6.2 Raptor now has a little over 120,000 miles on the original plugs and I can tell a difference in the sound of the idle. So, I took it for a ride and the engine has a slight pause at tip-in, but then pulls strong but a little flatter.


I could probably remove the plugs, file the electrode flat, file the ground strap flat and back so it just gets over the electrode, and reinstall the 16 plugs. But I probably won't. I'll probably just install 16 new plugs. Might run better with the old plugs set up. At one time I spent a lot of time with a spark plug pressure machine learning how to make a plug continue to spark under more pressure. Oh well..................

[barnym17]

What I've found with Fords 4.6 with c.o.p ignition is the normally run fine till you go to start it and it simply will not start. We had this quite a bit I have measured gaps at over .250 before they did this.

[Truckedup]

What I've found with Fords 4.6 with c.o.p ignition is the normally run fine till you go to start it and it simply will not start. We had this quite a bit I have measured gaps at over .250 before they did this.

I have heard some vehicles will fry will fry a dual outlet coil when the gap gets huge... When the GM HEI was new ,ignition trying to fire badly worn plugs could burn up the rotor...

[Geoff2]

Yep, what Truck said about burning rotors. Then people blamed the HEI design,when the problem was not a design problem at all, but lack of maintenance...

[barnym17]

it will eat the plug boots on the 4.6 and sometimes kill coil.