I have heard alot about these plugs helping performance and fuel mileage.
Im just woundering if anyone has tried them and do they actually do what they say that they will.
I have an 09 sierra 4x4 with a 5.3 and was considering trying them. Am I waisting my money or will they help at all?

Thanks Dave

 

I would say no man.... possibly little better spark (not likely)

but all in all just another gimmick. Just get some good plugs and you will be fine.

but yeah all of the marketing says they will do everything including **** gold and sunshine, nut all in all thats why we have marketing is to sell crap you dont need.

 

If you are running a stock truck just use the stock plugs...if you add mods most are using the ngk's. tr55 for n/a setups and tr6 for FI.

 

please don't take out your nice factory iridium plugs for that ****.

 

Those plugs are junk, I've heard nothing but horror stories about them. Your truck has the best plugs available in it from the factory...the Delco/NGK iridium plug is excellent.

 

I was going to say the same thing.

 

Ok school me here. I was autozone and they tried to sell me Delco/NGK iridium plug and they wanted like $75 for these plugs and told guy counter to f him self. I put bosh platinum for a dollar a pices. I'm getting 17.5mpg. I ran in my old FI set ngk 66 and they are platinum plug as well. What so special about iriduim plugs? Sorry for any spelling or gramer I writing on my sell phone. Thanks

 

The main advantage to an iridium plug is that it can be run longer without wearing out and needing replacement. Iridium is a harder metal than copper or platinum. Supposedly, the iridium plugs also help for a more complete burn and less carbon deposits...but those are claims that I've read from Denso and may just be marketing. From what I've seen, generally speaking, average spark plug change intervals (on properly tuned engines without mechanical problems), are as follows...(remember, this is a generalization, different manufacturers have different recommendations)

Copper plugs, approx 24-35K
Platinum plugs, approx 60-70k
Iridium plugs, approx 90-120k

I've replaced Toyota iridium plugs with over 200k on them and the vehicle was running like a champ...the electrode is so small that I need a magnifying glass to inspect it...

Glad to hear that the Bosch plugs are working out for you, I've had nothing but bad experiences with everything that Bosch makes besides their relays, which I've replaced many of also fwiw. Seems like the Bosch stuff only works half way decent in Volkswagons, which are junk boxes in my experience...performed many repairs on the ex-wife's 93 Cabriolet...I hated that car

Another note, which many guys don't understand...

If you are switching to an iridium plug, and your vehicle originally had a platinum or copper plug, you will need to run a different plug gap than your original factory spec, as the iridium electrode is obviously a different metal with different composition and resistance. Iridium plugs usually come pre-gapped and should not be adjusted. If you need to do so, be sure to only touch the ground and not the electrode as the iridium tip is micro welded on the plug and will easily snap off if pried against.

The plug gap that I've seen for our trucks with iridium plugs is .040, while the platinum plugs are .060. Guys generally gap their copper NGK TR55's between .050 and .060. Corey (BlackGMC) learned that the different years with different plugs also have different spark dwell setting in the tuning, which I feel should probably be adjusted when switching plugs (just to be perfect lol), but the differences are so slight that you probably would never even notice a performance or efficiency difference.

 

thanks for all the great information as always guys

 

Glad to help man...a couple of years ago, before my daughter was born and I had more time on my hands lol, I did a lot of research on spark plugs and a little experimentation. My truck was running well and only had about 35k but I decided to change my spark plugs anyway. When I removed the factory platinums, I was surprised to find that the gaps were inconsistent from the factory and ranging from .040 to .065. I replaced them with some good quality Denso Iridiums and ran those for a while. The truck ran exactly the same and I made the same amount of trips to the gas station. Then for poops and giggles, and since they were so cheap, I tried some NGK TR55's as recommended by so many folks here. Gapped em at .055 and gave them a shot...same results.