*HELP* Issues After K&N Install

I used to chase boost leaks on my old 2.7TT Audi engine. We'd make a plug and pressurize the system, then use soapy water.

Click here for Google image search to show examples.

 

Carb Cleaner, use it to spray on hoses and connections.

 

*UPDATE*

So I wanted to post an update as this could possibly help someone else down the line. As soon as I left work yesterday afternoon, check engine light came on. Went to O-Reillys. I picked up some CRC MAF Cleaner.

First thing I did check the codes. P0171 and P0120. Essentially Too Lean and Throttle Position. Weird. So I cleared them. I then checked all the vac lines. They were solid. Seated properly, no pinholes. So I then decided to check the filter connection to the tube. Sure enough, the clamp came loose because I made a rookie mistake and didnt tighten down all the way initially. Dumb me. Fixed that.

Go for a test drive. Seems to be driving a bit better, but check engine light goes off again, and its still rough. Go back. Check codes. Same two codes. Damnit.

Next I disconnected both battery cables and turned the key a few times to drain any residual power, as suggested. With the cables off, I took out the MAF and gave it a once over. It wasnt that bad and really shouldnt have been fouling up. The filaments did seem to have a layer of dirt on them though that looked hard. So I sprayed the shit out of the MAF, inside and out, along with the pins. I let it drip dry at first, and then went over it carefully with papertowel. Once all dried up and clean, I reinstalled, nice and tight. Put battery cables back on and went for a test drive.

I could literally feel the difference and feel the ECU learn the new mapping while I was driving. It didnt take long at all. And guess what? No check engine light. I fixed it! Woo! This thing was hauling ass now and finally could feel the power difference.

And as I was having fun. Check engine light.

DAMNIT. Thankfully when I checked it, it was a different issue. Too Lean and Throttle Position were now fixed. The issue now is something that has been plaguing the truck since before I got it. Needs a new knock sensor. Otherwise, its all fixed. And so much fun to drive.

 

Had exact same reaction in my 2023 Tacoma TRD .Acceleration was worse then usual and idle was way up.I used a dropin K+N oiled filter.Have used K+N filters for years never had this happen before.Back to stock for me.