Tired of trying to find what's throwing codes..
 

2002 f150 5.4
I got a gryphon, shorty headers, larger throttle body, kn intake, dual exhaust, Maggie hi flow cats.... I've been throwing bank 1 and 2 lean for a year or so and I'm straight up tired of trying to find what's causing it. I've changed plugs, injectors, cops, hoses, gaskets, seals, o2 sensors.... Can't count how many cans of starting fluid I've sprayed and can't find anything. Ford place quoted me $115 for a diagnostic ran on it. I already made it clear it was for diagnostic only and for them to NOT flash my PCM... Talked to php and got the instructions for the gryphon.. Is the price for diagnostics a fair price? They said it would include a smoke test. If this don't work I'm all out of ideas :(

evap canister under the bed of the truck near the spare tire will likely be tha cause. Also your gas cap may not be sealing properly.

I just had the cap tested and it passed, but ur right that very well could be it. The evap canister I replaced with one from the junk yard just to see if that was it but it could have been clogged too. The truck has 125,000 HARD miles on it... My wife just asked me "what you gonna do when they say it's just dying of old age..." sigh

Neither the evap canister or the gas cap can cause "lean" codes. Dead end.

Spraying starting fluid on a fuel injected engine is useless unless you are watching the sensor outputs or the short-term fuel trims on a scan tool. The computer will readjust so fast you'll never see or hear any change.

You need to start looking at the data coming from the MAF sensor, the O2 sensors, fuel pressure, fuel injector pulse widths, calculated load, and the like. You've got so many mods on that truck that the tuner probably isn't compensating adequately.

Ok.... Where can I get the scan tool? I thought I could rent it from AZ but what they have I can already do with the gryphon. Damn ford place.... Cost me 102 for them to tell me return the truck to stock and it will run right...

Heres a question though... I have to have my custom tunes from the gryphon for it to run right. I'm throwing codes while using the custom tunes. If I return the truck to stock, the everything is going to be screwed up because of the aftermarket stuff.... How the Fu$k do I diagnostically figure out what's going on? I was told to return the PCM to stock before bringing it to the ford place

You are dead wrong my friend. If you have a slight vacuum leak you will be getting a lean code because you are getting unmetered air in past the MAF. It will still run well because the O2 sensors are reading properly and correcting for the unmetered air. I've seen it at least a hundred times (no I'm not exaggerating).

Get your truck smoke tested.

In what regard?

Of course a slight vacuum leak will cause a "lean" code. But you can't get a "slight vacuum leak" from a gas cap or from the canister since the evaporative emissions subsystem is isolated from the intake tract by the vapor management valve. Any leak or clog in that section won't cause "lean" codes but will set evap codes.

I've seen slight vacuum leaks cause lean codes numerous times myself. I've also seen exhaust manifold leaks cause them, dirty/faulty MAF sensors cause them, low fuel pressure cause them, and, as it appears may be this case, willy-nilly modifications. A smoke test will show if you have a leak in the intake tract post-MAF but it's only one tool that might be needed.