Ford guy #6

System adaptive fuel too lean

What exactly does this mean I know that it lean means not getting the correct amount of fuel but not sure where to start trying to fix or look even the P0174 was shown pending and the P0171 kicked the cel need some help or advice thanks in advance

DaytonLax14

What motor? Check for vacuum leaks. If no leaks then it's either your pcv valve, maf sensor, or intake manifold gasket.

Ford guy #6

It's a 5.4 how will I know if its the intake gasket or the maf? I check for vacuum leaks with carb cleaner correct?

DaytonLax14

Yeah but my intake gasket was leaking and I couldn't tell from carb cleaner. Just spray your maf with designated maf cleaner. Go over all your vacuum lines. If you don't see anything, you could smoke test with a cigar. Light up a cigar, inhale, then exhale into a vacuum line. The smoke will lead you to your leak

DaytonLax14

Be sure to check the vacuum elbows pieces. They are known to crack.

Ford guy #6

Sweet thank you for the info and quick replys

Frank_Ford

Cleaning your MAF sensor is just good maintenance and it could very well be your problem. The MAF cleaner available at your local auto parts store is less than $10. While you are there, buy a new PCV valve (also less than $10) as these are cheap also. Look at your vacuum hoses for damage and replace (also cheap) if they are badly cracked or kinked. Save the big job (intake manifold) for last.

Ford guy #6

That's my plan I have to wait till Friday (payday) this shouldn't harm anything to drive it till then right?

Tackle

You're fine to wait.

Frank_Ford

It should not be a problem. Forgot in my previous post that it could also be a fuel filter that is not allowing the proper rate of fuel flow. This is also cheap and good maintenance and if it hasn't been done lately, should do it now. Also, adding a bottle of fuel injector cleaner to your next tank of gas will clean up your injectors and might improve the running of your truck.