They came with washers/gaskets in the box, but not on the plug. Do i install my plugs with the gasket?? Did you guys install the plugs with or without the washer/gasket thing?

 

i hate to rain on your parade the the plats are a junk plug. they dont run well in our daks. you need to get the autolite 3923 plugs. they come with everything already on the plug, i tried the plats and lost almost 60 miles to a tank of gas. after ready a few threads i found everyone is using the 3923 plug. had nothing but great luck with plugs and it also took care of that stumbling now and then. and for 10.80 for all 8 at walmart you cant go wrong

 

This doesnt make any sense to me.

A platinum plug is a more efficient conductor then the copper. It's said that Plats pruduce a less powerful spark then a copper plug, because it requires less voltage for a plat to jump the gap. To fix this, normally you should gap a platinum plugwider then a copper plugs OEM gap. This will require more voltage to jump the gap, and makes a more powerful spark.

So knowing this, I can see how mistakes can be made with autolite platinum installs, because if you look on there site, they call for the same gap, whether its copper, platinum, or iridium. Thats NOT correct.

I see that for my V6 3.7L, the stock OEM gap is .035, for the stocker coppers. Autolite's platinums also say .035 on there site. This is wrong, and will result in power loss.

Truth is, the gap needs to be wider on the platinum to have the engine run the same.

Autolite fails to make this adjustment. BUT, if you look into ANY other brand, you will see that the correct gap for a 3.7L V6, running PLATINUMS is in fact.044, and NOT theoem .035

Thats why I am going to try the autolite platinums first. This is the correct practice when changing plug types.

I seriously doubt that I will see a problem. If I do however, I will take your advice and go with copper.

 

Good to know. Please keep us updated on this. Nice find!

 

No harm in trying. I talked to autolite, it seems that they think the plug should be at .035 reguardless of what i think lol. NGK seems to agree with me. Who to trust who to trust? lol.

If it goes bad I'll go with copper.

 

Yeah I will try the new gap. What do you mena the old gap didnt work exactly? It doesnt run right at higher rpms or??

 

You may want to check your information sources, copper has a much higher conductivity than platinum.

 

I didnt say the plug was a better conductor. I said its a more efficient conductor. It lasts 100k miles, the gap doesnt change due to wear, etc.

The plats have been in for a few days. They work great.

The stockers were NGK Coppers gapped at .035 They were worn so they were in the high .04x

I installed the platsat .044 gap and they ran smooth, seemed fine. I then lowered the gap to .035, and they ran even better.

The truck had a hicup at idle somtimes with the old ngk coppers, since day 1. that is now completely gone, and the truck idles smooth and quiet. The truck feels as though it has had a tune up, as it should. Power seems normal, as it should. Nothing seems unusual due to them being platinum.

Took the truck out and hit high rpms through a few gears, then climed a higher gear slowly to a decent highway speed, everything seems powerful smooth and regular.

Maybe the v8 has an issue with plats, but the V6 runs great with them.

I left them gapped at .035, they are double platinum autolites...part # app5224.

I will keep you guys posted with possible MPG changes, but at this rate, I don't see anything different.

The trucks set for the next 100k miles.