Originally Posted by 5.7_Tundra
Desi, if you know anything about tuning you would know A/F's that low means something is wrong with the car, not necessarily the tune. Sounds like a serious boost leak. Pressurize the system and spray soapy water on everything from piping, couplers, throttle body, and manifold gaskets. Make sure to check for cracks in the manifolds also.
If the tuner says they tried everything possible(tuning wise) to get the A/F's correct and nothing would happen, it's not the tuning.
Also, I've never seen an air filter and intake piping change the A/F's from 11:1 to 9:1.
Do a boost leak check and I'm sure you'll find the problem. Let us know how it goes.
When you've been in a certain field for a number of years you become pretty comfortable while working. Being on a cell phone tuning a car or any other job for that matter is not considered professional, but keep in mind, a missed call from your wife could mean a couple nights on the couch. Sometimes it's better to seem unprofessional then to deal with wife issues. If your not married yet, you won't know what I mean.
I think the tuner is right in this situation. Next time the car is getting tuned and issues come up, stop the tuning immediately, and bring the car back another day.
I recently had a similar situation at Topspeed. The injector duty cycle was too high and the A/F's were off substantially and we didn't know why. After tuning for about 30 minutes with no luck, we began troubleshooting the issue. It turns out one of the vacuum lines was off and hiding under the manifold out of sight. We reconnected the line and the A/F's were back in check and the duty cycle was dropped.
The littlest things can cause the biggest problems.
Edit: BTW, tuning should have taken 30 minutes TOPS on my car, but because of that little issue I paid for 1 1/2 hours. Sucks, but as the saying goes "you gotta pay to play".