Black94Snake

I haven't changed anything with the tune or any parts in the last 2 years,why would my maf scaling be suddenly off that much?

Would an exhaust leak affect the 02 sensor that much to read

lean and add fuel?

It wouldn't, and it's absolutely idiotic for some to suggest such.

Many years ago, my wife's FXT suffered from a high AF Learning A value. It was a tear in the intake boot after the MAF. You don't necessarily need to have a vac leak or an exhaust leak.

Our issue was solely because the intake boot would pull open slightly at idle, but once the engine torqued over slightly from being out in gear or driven, it would seal the leak and show no other signs of a problem.

I'll give that a try and report back.

Ignore the people who tell you that you're going to blow up your car.

Start the car and let it idle until it hits operating temp.

You'll know very quickly if it's the map

OP: Do NOT do this! Running a stock map with a free-flowing downpipe is a clear path to #YNANSB.

Lmfao...

What a tool

Go back to your stock map and cruise around for a while, and watch your AF learning.

If it's no longer a problem, then the OTS map is your issue.