On WOT, I do have some kind of gasseous vapor coming out of my exhaust. I don't see that I'm burning oil and the gas is not blue. Could I possibly be running too rich and burning excess fuel, in turn creating more gasseous exhaust vapors? I currently get between 260-280 miles on a full tank. I use Castrol GTX 10W-30 oil on an engine with 130,000+ miles.

 

did you check your plugs yet? that might help in determining if you're running rich.

 

You have to use a wideband O2 sensor on a dynojet to see if you are running lean or rich.

If you are running rich but EGTs are high, you may have a timing issue.

 

Not checked, not dynoed, I'll have to follow up on this. Thanks.