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Building a Tune

Bird

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Before you do anything else, monitor your fuel pressure throughout the run - may have a problem with the connecting hose in the tank that is impeding enough fuel delivery during WOT conditions or th epump may be going out.

Also, clean your maf sensor - may have dirt on the elements that is causing faulty readings.

If all that is done / checks out, then your canned 93 octane tune needs some tweaking.

Bird
 


Dirmaid

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2001
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good eye bird, i'll hook up the logger and see if it can pull the fuel pressure from the computer. I'll check the maf while i rebuild the intake system, it just isnt pretty enough for me. I'm getting a new intake pipe bent for me and building a custom air box for a future project that is completely unrelated.

On a side note, my fuel pump usually makes a quite audible whine when it primes the system for start up. It is loud enough that i can hear it at the crappy range of my remote start. I always figured this was normal for rangers, but since you brought the possibility to the table i thought it was worth mentioning

edit: after research, you apparently cannot pull fuel pressure from the computer due to lack of an FPS on the fuel rail
 
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Dirmaid

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Louisiana
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2001
Make / Model
Ford
Engine Size
4.0 SOHC
Transmission
Automatic
After letting the computer relearn itself, I gave it about half throttle merging onto the interstate and the afr settled into the 12.4-12.6 range after a couple seconds of holding it out. I was surprised at how long it took for the gauge to start showing a low afr though. I'll make a WOT pass later at the track to see how that's looking and let y'all know how that's looking
 

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