Im running 11.8-12.5 A/F in 1st 2nd and 3rd gear, in 4th its 12.4-12.5 all the way up to about 5500rpms then it shoots straight up to 16.8-17.8!

My tuner says hed like to see 11.8-12.0 on pump gas and that my consistent 12.4-12.5 is too lean for safety. But you guys seem to think thats fine. Has anyone installed an A/F gauge on a stock car and what was the A/F? He wants to know what Mercedes considers safe from the factory.

As far as jumping up to 16-17 its lack of fuel, either injectors or fuel pump....after everyone says they are plenty suffecient.....i think not.

Im currently running colder ngk "7" plugs stock gap of .039 but now im considering dropping that to .025 to se if it makes any difference in the A/F readings.

What you guys think? The last thing i want to do is tune it leaner if its already too lean.