Lean Code
should only occur once, and that's if the idle learn is not done immediately upon your first start up.
Let the car idle until the water temp reaches 176-degrees. Then set your timer on the DIC (Under TRIP) for 5 minutes, once you have idled at 176+ for 5 minutes, shut off the key, and let the car set for 30 seconds. Idle Learn Procedure is done.
Remember, anytime you disconnect or lose power to the PCM, this must be done again to set the initial throttle plate postition.
Disconnecting the battery to install the intake system is not necessary, but the New Air, requires a 'Idle Learn Procedure' since the a/f ratio for cell 18 (AC) and 19 (AC-off) cannot reset itself stoichiometrically without this learn session. All other fuel cells reset automatically with just a few miles of driving. WOT is a factory preset enriched fuel cell which cannot be altered except by programming.
This is why programmers work on fuel cell 22 ONLY. They cannot change the other cells, since the O2 sensors will automatically reset them back to 14.6:1, no matter what you do.
One footnote. The automatic 14.6:1 ratio for cells 1-17, is why increased airflow makes so much power on the dyno. If you add 10% more airflow to the engine, the computer adds 10% more fuel to each trim 1-17. That automatically increases power 10% with all the fuel being burned at the stoichiometric condition.
WOT, however, can change to a degree, but the method for the PCM to add fuel is rudimentary at best, and cell 22 (WOT) takes its cue from the last cell you were in just before entering WOT. If the computer was perfect, it would know that you have added 10% more fuel in the stoichiometric cells, but it looks at the cell you are in before you floor it. It may or may not be 10% in that cell, due to many conditions. This results in an overly lean WOT, which is ok until you get spark knock, which results in timing retard, negating any gain from the New Air.
DYNO TIPS:
Interestingly, if you see you dyno numbers vary from pull to pull, try using the AutoTap program on the dyno. You can make sure you enter WOT from a fuel cell that is close to zero LT Fuel Trim. That gives WOT the best chance of around 12.6:1 a/f ratio.
When the dyno pull is more or less than 12.6:1, you dyno numbers will vary. The same is true of oil temp, and water temp, which the dyno cannot correct for.