Mileage For Spark Plug Change

[radman]

I'd like to see the '06 FJR get individual coils mounted atop the plugs.  This would eliminate the bulky spark plug wires, clear up the area above the engine head, and replace the two large coils near the battery with four small coils above the plugs.
With four coils there would cease to be any interaction between plugs.

Actually, there are still plug wires attached to those coils-they're just very short ones. While the multi coil setup is fairly reliable, the fact remains that as you multiply the number of components in any system, the chances of a failure occurring increase as well. With 4 coils, the chance of one failing at least doubles. We've seen this on the Ford and Chev V-8's using this setup. And, they're no bargain, at about $85 a pop. While the former 2 coil systems rarely had a failure on the Fords, we're seeing about 1 coil a week out of the roughly 100 various Ford cars and trucks we run, once they hit the 36 month age. The Chevs, half that. But all the Astros make up for it, with not a one out of 50 or so that has not had a complete ignition OH at least once, many 2 or 3 times. Thats cap, rotor, coil, and coil wire, as well as, yup, plugs. But they're out so often, we've yet to lose a 4.3 V6 head.....

The fact remains, plugs are cheap, even the Irids if you shop. I pay about $24 a set. I can tell, even with the fairly low mileage I have on them, the difference in overall engine smoothness and performance post change. That, to me, is worth it alone. The rest of ya, do what you will. But remember the old Fram commercial, "pay me now, or pay me later". See ya's on the service drive......

 

[radman]

Another one, just done. 04 Crown Vic squad. 48,000 miles. 2 coils, 8 plugs. Plugs shot, took coils out.

 

[Geezer]

I too have had problems with plugs which were left in too long. I had a Cadillac with aluminum block and iron heads strip the plug hole threads after leaving the plugs in for 100k miles. Costly to repair. Imagine how soft the aluminum heads are by comparison and you are taking a big risk leaving them in for very long.

I always use anti sieze thread lube on spark plugs and on just about everything else where the bolts are a different metal from the hole they screw into.

 

[radman]

I don't use anti-seize on them due to it's being a lubricant, and throwing off the torque feel. Though I could, I use the 1/2-3/4 turn after seated procedure for tightening on plugs. I replace them often enough that they come out easily, so seizing isn't an issue.

 

[sparky3008]

I changed the plugs, poured motoroil on my airfilter, changed the air in my tires, and made sure the air-fuel mixture was correct on my cummins just the other day and it runs much better.

:headbonk:

 

[daytripper]

In August I took my 05 to the stealer for the 8k service. When I picked up the bike I noticed the lazy bastards did not replace the plugs. I noted this to the service manager and he said they should be fine until the next service interval. I guess if you need a job done right then you have to do it yourself. :angry02: