Thread: Spark plug gap

I have diagnosed a recent exhausxt leak with seafoam in the intake. This loosened quite a bit of carbon, so I will be replacing my plugs.

My "mods" consist only of a 3.2 pulley. I run 85 octane pump gas.

Before you get into telling me I can't etc, I've been with this setup for ~2 years and 25k miles or so without incident.

My question now is what is the proper gap for my setup (not a tangent about the propriety of that setup)? Is 0.060" (stock) proper?

The plugs I'm putting in are here and I have them gapped @ 0.060".

The plugs I used before, also without incident, are here. They didn't require gapping, so I've not dealt with a gap issue post the 3.2 pulley.

Any advice is appreciated.

What sort of manifold pressure are you seeing at the top of second gear?

I have no idea.

That more or less reconciles with what I've read elsewhere too - I'm going to start 0.055".

Thanks

3.2 pulley on 85 octane? You scan for KR?

Originally Posted by 2007gpgt

3.2 pulley on 85 octane? You scan for KR?

He doesnt know his manifold pressure, I doubt it.

He's gotta be gettin some serious KR.. I get KR on stock pulley and many air flow mods with 94 octane

Theory is, less dense air, smaller pulley.

Hence asking for manifold pressure.

Until you know that, you can't determine whether or not the motor is flowing well.

Yes I've scanned, real time, for KR.

I MAX out at 4* after extended WOT (around 70 MPH). during normal driving, I can't get any.

I can also check for manifold pressure, I've just had no reason to thus far.

I'm at 5400ft altitute. Less air density and, more significantly, less O2 density.

The car has 138k miles on it. I dropped pulleys with 112k miles. That's 26k miles and about 2 years (I would have to check) with this setup. It's not going to blow up. The ONLY other mods I have are a K&N filter (stock ai - about 13 years old as I changed filters when I bought the car), MSD wires/coils, 3.2 pulley and gatorback. Now flow mods whatsoever.

If I drive it at sea level and run WOT, I would EXPECT problems and a grenade under my hood.

Curious if you monitor your AFR as well.

I can post both when I have my car back together - I need one more gasket to install my new cat (apparently Walker cats don't ship with any gaskets ).

My scanner doesn't do KR, but it does to pressure and AFR etc. My uncle's does KR.

Do you want them at idle or WOT or?

Originally Posted by JoRoW99

You say that like its a good thing.

It's reality - not good or bad.

This car is my daily driver. I don't care to have it all modded out. The only reason I dropped pulley sizes is that I replaced the coupling a while back when it sounded like I had rocks in my snout. I decided to also throw a smaller pulley on it as well.

You'd need a wideband to measure AFR unfortunately.

I'm just curious if the KR is because its running lean.

If so, you might be able to correct that via a tune, car might run a little better.

Which is good right?