The pilot hasn't received clearance from the tower as of yet... If you want off of the plane, it'd be VERY VERY SMART to stay in the terminal.

You're not in Kansas anymore, Toto.

 

 

There's no reason to become alarmed, and we hope you'll enjoy the rest of your flight. By the way, is there anyone on board who knows how to fly a plane?

 

I do, but I haven't had any lessons on landing yet.

 

Hmm... I'll try to elaborate..... this is how I understand things... correct me if I'm wrong..

When your engine is running, it is measuring the ammount of air comming into the engine. It knows how much fuel to add for that volume of air to generate the correct a/f ratio. This info is based (among other things) on a table that can be modified to suit the given conditions (such as vacuum leaks, injector wear etc). When the a/f mixture is burned, the O2 sensors read the O2 concentration in the exhaust pipes. If there is too much or too little O2 left over, the PCM modifies the tables to correct it.

So, when you modify the intake, the MAF sensor doesn't read the correct volume anymore. So when the PCM adds what it thinks the "appropriate" ammount of fuel should be, it ends up being wrong. Therefore, the trim tables (based on O2 sensor input) get modified to correct the problem. But there's a limit to how far these tables "should" be modified. If you cross that limit (a bad vacuum leak, or low fuel pressure, or ect.) then you will get a CEL. That DOESN'T mean that the PCM didn't correct the issue, it just means that you have an issue that is larger than the prescribed limit, so it sets a code.

When you hear people talk about the transfer function, they are referring to "recalibrating" the MAF sensor algorithm so that it reads the correct ammount of air.

My question was related to the last comment in Justin's post:
He mentiones that most vehicles can adapt (like I mentioned above) to a CAI, but he says that they won't adapt to the 3.5" intake. I was just asking for the specific reason.... I was wondering if the reason was:

(1) The PCM adapts under closed loop, but that adaptation doesn't transfer over to the Open loop table for whatever reason.

(2) the ammount of air doesn't match the prediced ammount of air based on the throttle position sensor's reading. If that is so, then the PCM may ignore the MAF reading all together.

Or: (3) the truck really does correct for the 3.5, it just sets a CEL and there's no way to rid yourself of it except for a retune.

I have been considering buying a newer 04+ F150, and the answer to that question would help me tune it.

 

Landing is overrated anyway, just jump out

 

Never seen Airplane then... the whole point of the movie was landing the plane.

 

hey, justin. based on what you are saying here, would it be alright to do mods like the gotts intake or air intake silencer removal on the newer 5.4's? based on that info, as long as you are using the stock airbox, it should be ok, right?