mr. ut

what will the engine do if you put the trailing plugs where the leading ones suppose to go and visa versa???

cmartinp28

put in the wrong plugs and you will see peices of your apex seals coming out of your exhaust

Raymr

I found mine reversed too, when I bought the car. They were new so I took them out and put them back in the right holes. There was no difference regarding before and after performance. One of them seems to be a hotter plug (can't remember which one), so I think the difference between leading and trailing plugs has to do with the operating temp. they're exposed to, and therefore long-term plug life.

Scott 89t2

probably nothing. I'm running 4 trailings right now.

just don't swap the plug wires around

gotorx7

I should think that the leading plugs will tend to foul quicker, and the trailing ones to burn out.

But it won't make a huge difference to anything else unless you are already running lean and/or hot...

RETed

Nothing bad will happen...cmartinp28 had been smoking too much crack!

Now, if you get the trailing spark plug wires switched around, this can lead to detonation and eventual engine damage if you don't back off the throttle...



-Ted