jaybrown

How can you tell if your running lean. I don't want to wreck my engine. When I run 87 tune compared to 93 tune. The 93 tune is way louder and more of a popping sound when I let off the gas. When you run lean does that mean the octane isn't high enough?

jaybrown

Anybody know how u can test this?

08RescueGreen

Running lean means your fuel:air ratio is off with the fuel ratio being too high. That will cause the popping sound you are hearing. Have the person who tuned your jeep check it out and change the ratio. Switch to the lower octane tune to preserve engine longevity.

Dark Shadow

Only way to. Check if your running lean is to buy a wide band o2 sensor gauge

Or go find a dyno and do a couple of runs on it. They will tell u.

The jk's are tinned for mid grade. Running anything else can hurt or cause problems.

jaybrown

Ok thanks I'll stick to 87 tune not 93.

jaybrown

I think running lean is the air ratio is too high not enough fuel. ????? So higher octane would help ???

evoviii2jk

Running lean does mean that you don't have enough fuel. Your air ratio is too high. Higher octane fuel won't help enough. If you are truly running lean you need to get it fixed. Running lean makes cylinder temps rise and if they get hot enough you can melt pistons. Not that you will reach that kind of temps in a jeep.

jaybrown

Ok thanks. So if I run the superchips 93 tune on my jeep. Why do some people say I'm going to run lean. It has more power so isn't it spraying more fuel

evoviii2jk

You want to dance that fine line for more power. Leaning out a factory tune WILL give you more power but not knowing what your AFR's are reading you run a significant risk. Coming from the import world we would always have cars tuned and dynoed

jaybrown

The dyno will show you that ?