P0172

[F150 Man 4Eva]

System running too rich (Bank 1).
This is a code that I have seen quite often since getting my Gryphon last year. This is the ONLY code I have ever had thrown on my 2005 F-150 5.4 with 77,000 miles. The code wasn't instantly thrown when I first installed my Gryphon last December. I got the code maybe 8 times total last year. Well, I decided to return to stock and take the Gryphon out, and take a trip to the dealer for service. I told them about the code (which had been cleared out the previous day), and I asked them to check into it. They told me that I need a new Mass Air Flow Sensor, because mine is not allowing the right mixture of Air and Fuel. I told them, that I would take care of it myself. Well, I tried cleaning mine first with MAF cleaner, and no change. I decided to get a new sensor, the truck seemed to run a TINY TINY bit smoother, and I was thinking...Great!, this is going to fix the issue. A couple days later...P0172. It is happening more and more now with the colder weather (or atleast it seems). The truck runs great! There is no rough idle, no hesitation, nothing! I love the way the Gryphon has improved my power and shift patterns...but the only conclusion I can draw is that this programmer is causing this code. Any ideas? Thanks!

[F150 Man 4Eva]

Where is everyone? No thoughts? No suggestions?

[Longshot270]

I dont know much about it but here is what I'm thinking. Run the truck stock and see if you can make that code come back up. Try to copy the conditions that would cause it before. If it still comes up then we can rule the programmer out. Only problem is it sounds like the code cannot be induced.

You didn't by any chance say you had a CAI?

[F150 Man 4Eva]

Yea, you are right. That makes sense. But you are also right that the code can't be induced. I would just have to go stock and run that way for...months possibly. I do have a K&N setup.

[Longshot270]

Here is some info from the dtc list in my sig. Might want to check the ones you can like the regulator.


--Possible Causes--
Air Measurement System
- MAF sensor (contaminated, damaged, corroded connector, etc.).
You've already cleaned this

Fuel System
- Fuel pressure regulator (vacuum hose off, diaphram leak, malfunctioning, etc.).
- Leaking fuel injectors.
- Fuel return line restricted.
- Fuel rail pressure sensor (incorrect reading).
- EVAP canister purge valve leak (when canister is full).
Base engine
- Engine oil contamination."

[Jackpine]

One thing to keep in mind is that the MAF sensor is very delicate. Here's a link to a good article on cleaning it: How to Clean MAF-2005 5.4 - F150online Forums You might ask yourself how you did it and try to decide if it might have been damaged.

Otherwise, DO try driving in stock (or at Level 1 tranny only if you still have that tune) to see if the code repeats. You can leave the Gryphon plugged in of course when at stock.

- Jack