2 Questions about my air/fuel leaning out...

busterc

New Member
Nov 16, 2004
12
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farmington Missouri
This is on my 2006 Mustang GT with Paxton supercharger and Diablo Sport tuner.
I hooked up my ne Air/Fuel gauge and now I'm concerned......

Question #1
When cruising on the highway or where ever, and I push the throttle half way down just enough to get the car moving faster, the Gauge goes to lean and will slowly go up a little as I increase rpm's and it also feels like it has a slight hesitation when it is leaned out, BUT if I push down to WOT it jumps up to just in the rich area and runs perfect.
Why would it lean out when I give it part throttle and how bad is this? How do I adjust for this?

Question #2
When slowing down to come to a stop, the Gauge will go to lean and stay there as long as I don't have my foot on the throttle. If I touch the throttle it comes back up where it needs to be.
Is this normal or is it bad?

On the DYNO sheet AND wide open throttle the air/fuel mixture starts out at 14.7 and drops to 12.25 around 4000rpm's and stays there throughout the run........
 
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