Got the car running today with a new MTX-L A/FR gauge. Have never used one of these, but moving from 6000' down to 1000' figured it would be the best way to set the car up. Idle reading is 22.0, and just off idle drops to 17.8. Engine is a 499 stroker, 14:1 cr., Demon 1090 carb jetted 93 pri/94 sec., no PV. Just don't understand why it's reading so lean with that size jets. Thanks for the help.

A gasoline engine will misfire at 22:1 a/f ratio. I think your readings aren't accurate. You may be getting reversion and the sensor is reading air being drawn back into the exhaust. Where did you install it?

In the header extension, about 6 in. in from the tip.

No mufflers? You may have to move it upstream into the header collector, not the extensions.

Does your model air fuel gauge require any free air calibration? Sometimes the high end ones have you swing them around in the air to make sure they read correctly.

Yeah, I calibrated it before I started it. Maybe engine is too cold? Didn't want to run it too long that way, afraid I' d hurt something.

Here we go again...

?

t be able to look at the plugs until I get it to the track. Jetting is what BG put in at the factory. I assumed that would be a good place to start.

You will never get a good idle reading with open headers. It will always read lean. Set the carb so it idles good and set the carb to 12.5 in high gear under full power. I.E. Just before you cross the strip. Better yet set it up to read the LAMBDA scale and set up to read between 15 to 20 % rich under full power. I.E. 80 to 85%

Thanks, I guess I won't know where I'm at until I get to the track. It's starting to make sense now.