I've never had any experience with the Bosch IR plugs.... just the platinum. I think they must use the bare minimum amount of platinum to get away with calling them that. I've seen the center electrode worn all the way down so that it was recessed in the ceramic insulator, and the plugs were maybe a year old. The cheap copper Bosch plugs, as OEM in some german cars seemed to be ok.

 

Wrong. I've used them, once, and I've seen the results when others have used them, countless times. They are without a doubt the worst plug you can buy. This is why a bosch plat plug is $5 and an NGK plat plug is $15.

 

First, the electrode is all the way down to the porclean when brand new, that is their design.
More expensive plugs don't mean they are any better. If you are looking at new teck. plugs, the E3's are around $6 and out perform most of the newer plugs on the market.

 

Bingo!! They are excellent plugs.

 

Yeah, their bad design. After it wears a little, the electrode is buried deep inside the plug. If they truly had a measurable amount of platinum they wouldn't wear like they do, and they would cost more.

 

I was just using coppers... caused all kinds of problems. I went to Bosch IR's... been running like a top ever since. E3's may be better tho?

 

Mike, how much life do you get from your +4's/how often do you change them? and what is a reasonable life span for double platinum plugs?

 

much thanks to Mike and the guys that helped me out on this board. Turns out all i needed to do was replace a plug in #7. Thx guys!

 

I’ve Change plugs coils and wires. Check engine light is still flashing after I reset code. The only code I vet constant is misfire cylinder 6 but funny thing the coder reader gives me 2 codes for that misfire. Some times but rarely it will throw the code for random multi misfires. Also when I changed the coil packs I noticed there isn’t any locking clips on the connectors so they are just pushed on.

 

@Steven Hill Pull the #6 plug and take a look at it, if it was a bad connector you would get multiple misfires related to that bank not just 1 cylinder