For those that don't know, I just bought a 2000 F150 5.4 Triton with 272k miles.

I had a code 0171 and 0174. After checking for leaks in the PCV elbows, checking the fuel filter, and everything I could think of, I finally decided to go back to basics. When I opened the air filter, I found the problem. The little cone had come off the front of the filter. So, that is the good news.

The (potentially) bad news is that I don't know how long the filter was bypassed. The intake sensor looks clean, as do the insides. But, that doesn't necessarily mean much.

What preventative measures do I need to take?

 

272k?? is that original miles or has it been rebuilt??. i wouldnt worry about it. maybye clean your m.a.f senser and throw on a new air filter.

 

All original miles.

I cleaned the sensor and put in a new filter. It seems to be running very nicely.

 

wow!! 272k .keep a close eye on her ans she will hit 300k no problem

 

Most importantly change the oil and filter as that it where the grit will end up.

 

wow, 272 hope mine last long