I tried the E3 spark plug, I have them in my snowblower and lawnmower and chainsaw, LOVE THEM in those engines, the lawnmower and snowblower have both been in for over 5 years and still going strong, I can run them at full choke and they will not stall.
Chainsaw is 10 years.
So I tried them in my truck, they have a large ground electrode like the +4's do.
I developed a rough idle when hot, only when hot, ran well down the road.
Changed plug wires.
No change.
The whole truck would shake, increase RPM just a little and problem went away.
Bought $.89 spark plugs and problem went away.
Turns out the ground electrode was holding enough heat that it would ignite the fuel before TDC.
So theirs my $.02.
Granted they are different plugs than the +4's, but the +4's still have a large ground electrode.

 

I went to bosch 4s. And instantly noticed more torque. And I was replacing NGK iridiums($20 a plug) that were still in good shape. I'm sold on them.

 

thanks for the info guys.

Chris
89 range rover classic

 

These are the posts that make guys think there are magic spark plugs

To the OP, the plus 4s wont get hotter nor will they have any benefit over what supposed to be in there that cost 1/4 of the price. I see these threads every few weeks and its usually a bunch of bickering. Boils down to the guys dumb enough to pay $10 a plug going at it with the guys who know the $10 plugs dont do anything. Bottom line is a basic copper core plugs changed when they should be changed is all you need. Plus 4, Platinum, Iridium, Bull S***ium, all a waste of money. Said it before and I'll have to say it one more time. The difference you feel when putting in new plugs is simply because you are replacing old worn out parts with new ones. You'll see an identical improvement from $2 NGK coppers over old plugs as you would with the magic plugs over your old plugs.

It's impossible to utilize all 4 of those tips simultaniously on the plus 4 anyway, thats not how electricity works.

 

On this note, the only advantage I see with a +4 plug is that it would last longer before needing to be changed. With 3 more tips available, the plug will have the proper gap much longer than a standard copper which will wear faster and develop a larger gap than optimal.

 

True they are said to last longer than copper plugs. I change mine every 6k miles so I can't judge the longevity of the coipper plugs versus their more expensive counter parts. Plugs are so cheap and easy to change though which makes paying a premium so you can ignore them for 100k miles pretty dumb if you ask me.

Anyone who leaves a plug in anywhere near the advertised life of those magic plugs is a few fries short of a happy meal anyway.