Quote Originally Posted by Fivefingerdeathpunch View Post
To answer your first question it totally depending on plug type/brand. A copper plug will be litterely nothing after 60-70k miles, seen it many times of chrysler motor from jeeps/dodge's. Like almost double the factory spec.

Iridium tipped plugs are made to last 100k in most vehicle, the gap from what I've seen might have moved 5%?? Done alot of plug changes on Vortec LS truck motors and they are fine gap wise but old plug wise and need of changing.

Not saying they couldnt open up more but it's not super common and nobody is going to have hard data to back anything up here.


And dropping pulleys without anything else is still a bad idea, unless you are running some 100-116 octane fuel all the time. And your first first question, incorrect plug gap won't cause a rotten egg smell. If the vehicle does not have a misfire, no real unburned fuel left to smell because the cat converter is there to burn up the rest.
Now thats the info I am looking for.

So, I will assume when the plugs were originally installed roughly 100k miles ago, and IF the plugs started at .060, it would be safe to say that after that time the gaps could be .078 when removed. They are now set to .060. Admittedly, I have not used copper plugs that much.

Which leads me to ask.....If I am getting the rotten egg smell, does that mean the cat is bad, going bad, or something else? No codes as of yet.