Hey guys, Running a 2015, xlt with a 5.0 with 60k miles.... recently upgraded the exhaust with a cat back magnaflow single pipe setup and added a K&N intake. Performed the recommended ecm memory wipe by disconnecting the negative terminal and jumpering out the positive battery post to the negative terminal to drain any residual power still left in any capacitors(as recommended). cold started the truck and let it run at idle for 15-20mins to allow the ecm to reteach the throttle body position values. The problem im having is that the truck accelerates great up to the 2500rpm range and seems to hit a wall where it sounds like its loading up and wont continue to climb in the rpms until I really start to stand on it, then it downshifts which makes the rpms climb fast as it downshifted maybe 2 gears and lots of power then up higher in the rpms. Any suggestions on why or how to get past this without having to do a tune? I do not have this problem with the factory intake on the truck set up with the same exhaust system.

 

Give it time to relearn shifting strategy.

 

shifting is fine, while the rpms climb and the engine revs it hits a wall where its like its not getting enough air or fuel or something causing it to loose power or struggle to gain. it gets better and opens up after the rpms climb over 3500rpm, problem is only between 2000-3000rpm range roughly. I did not have this problem at all with the factory intake and actually it feels like I had quite a bit more power when the factory stuff was on.

 

did you have to switch over your MAF sensor? maybe some debris got onto the sensor?

how much larger is the intake, does the manufacture of the new intake state no tune needed?

 

Put your OEM intake back on, see if it goes away.

 

K&N does state that no tune is needed in the directions for install, my truck doesn't have a " in tube" maf sensor. I put the factory intake back on and just went for a ride and it runs ok at all rpm ranges like it should. Starting to wonder if I should just send it back, was just looking for alittle better performance especially pulling a 8800lb travel trailer. My last f150 with the 5.4l had the same identical set up and the upgrades did it noticeable justice especially with a load behind it.

 

The relearn process requires a range of driving, not just idling. So go drive it.

If that doesn't work, I'd be suspicious of something constricting the air flow.

 

Recommended ECM wipe? You do realize that the ECM continually relearns?

 

A racing filter is not going to give you any more power over stock. And even if they did, it'd be at the very top of the rpm range, where there might be a little restriction. What you're getting A LOT more for sure is dirt in your engine. Racing filters, especially the oiled cotton gauze variety, filter for crap. You can confirm that very easily yourself using a ShopVac. Keep the stock filter, and just change it at the appropriate interval; your engine will thank you for that .