Have an 03 f150 xl with 188k. Bought it from a widow. Had a spectre in take on it when bought it. Check engine light is on and read p0172 and p0175 adaptive fuel too rich on both banks. She said her mechanic said it was the intake but wouldn't it read too lean? Checked fuel system and for vaccum leaks, but everything seams fine. I'm stumped.

 

There are a lot of CAI's that when installed, require a tuner to compensate for the air mixture. I added a JLT on my 2007 Mustang and immediately had to reflash my computer with a corresponding tune for that particular air intake. My tuner listed numerous different brands and models to choose from. Most, I'm sure use the same basic tune, but others really do require a tuner to run correctly.

Rich running codes, PO172 and P0175 are usually signs of a dirty MAF sensor in the tube itself. Had they been lean codes then looking for a vacuum leak would of been a good idea. Since they are rich codes, then you have an air problem. Too little air, or, dirty MAF or dirty throttle body behind the butterflies. There are some air mixing holes inside the t/b that can clog up and not give enough air to the system also. Cleaning behind the butterflies (usually by removing the t/b) helps the air fuel mixture. Just thought that might help you down the road with the rich conditions.

 

Thanks for the reply. I have cleaned the throttle body, intake plenum, all the ports for egr and all that, they a are spotless. Cleaned and tested mass airflow sensor. Fuel system all tests out good. I did however notice that the air filter they had on this truck is a 6" filter when spectre shows it takes and 8.5" filter. Replaced filter with a 10.125" because they didn't have 8.5" one at the parts store. I figured bigger couldn't really hurt if I was choking for air in the first place. We'll see how that turns out. I feel as though I was starving for air with a small r filter swing as though I have been oc r this truck with a pretty fine toothed comb and can't find anything that would cause rich condition. How expensive are those flash tuners? I don't really know much about em

 

Ive got the same intake on my truck and it has never thrown a code for me...yet. Try unhooking the battery for a few minutes to reset the computer and see if that does it for you. The programmers start at about $300 and you can spend as much as you want above that.

Note: I also have an edge programer that is set on level 2 most of the time.

 

I have done that before and the code keeps coming back. Im baffled as to what is causing it. If the filter size was causing it, how long will it take for the pcm to erase the code on its own?

 

re-set the code and remove the filter... run it to operating temp and see what happens... if the code pop's again .. it's not the filter. leaky fuel injectors will cause a rich condition and if it's been that way for awhile it will trash your Cat's and 02 sensors..

 

I was going to mention trying the O2 sensor. Exu is making adjustments based on that, maf and throttle. Maybe the o2 is fiving bad readings?

 

Appreciate the helpful comments. Replaced both upstream o2 sensors already. Cleaned and tested MAF sensor and it's good. Had all the injectors off already. They are clean, opening and closing and the resistance is good on all of them. If it was a single injector or COP, it would only read rich on that bank. Of course it could be more than one. But I was thinking air because it would effect both banks, right? Also the intake makes an annoying intermittent "fog horn" type sound. I know it's coming from the intake, but can't pinpoint for the life of me which part. I'm thinking air is hitting the inlet holes in the rubber boot where the 3" pipe connects to the throttle body just right. Kind like like blowing over the top of a beer bottle.

 

Always try to source a junkyard intake to see if that fixes the issue.

 

I have a question. Do you have access to a used throttle body you could try on your truck? I've seen hot run conditions caused by lack of air because of a bad t/b. Your sound could be because of the t/b not getting the air properly to the cylinders.

Rule of thought. More air and fuel, less heat in the motor. Less air and fuel, more heat. It just sounds like you are not getting enough air into the system. I'd check the t/b first before condemming the intake manifold. JMO, of course. G/Luck.

One more question. Were the two codes you showed your only codes thrown? Were they are P04XX numbers also?