I am in the process of tuning my car and I am dialing in the short term fuel trim, but my long term fuel trim is still -10.9. This is on a 2001 CLK55.

My short term fuel trim now goes from -4.x to 1.1 on light throttle.

I am still working on the other vacuum ranges.

I know I have been testing the car and it ran rich for awhile, because of larger injectors.

I disconnected the battery for 15 minutes, but the long-term trim is still very high, even though my short-term is dialing in.

How do I reset the long-term number or can I?

Does it just require a 100 miles or so of driving tuned on the short-term fuel trim?

Thanks.

__________________
2001 CLK55, Intercooled Procharger, HRE's, Brembo's, bunch of other stuff...