I'm selling my truck and don't want any problems afterwards.

I keep getting a P0172 code (running rich).

I changed the dirty K&N and put back the stocker back in, and it went from throwing a CEL like twice a day to once every two days, or twice a week.

What could cause that?

 

First thing Id do is clean the mass air flow sensor (MAF). Do some searching if you will. But, basically, its the unit which sits right behind the airbox and inline of the intake tube which runs to the throttle body.

Get electric contact cleaner or they actually sell MAF cleaner as well, spray it down, wait for it to dry, and reinstall 1 hr done deal.

 

glad you ditched the K&N... such a waste of $$ and to top it off they can cause problems esp when over oiled..

 

Like how rich? Black smoke coming from the exaust rich, I know it was enough to throw a code. You can also try the fuel pressure regulator. Good luck.

 

No idea how rich, really... I don't follow myself

I'll clean the MAF and hope for the best.

 

I walked in to that one.

 

I know cleaning the MAF is the generic answer for everything but a dirty MAF will cause a lean condition not a rich one.

My bet is AF/O2 sensor if you want a generic answer. If you actually want to diagnose the problem then start with these items: fuel pressure (high), leaking injector, coolant temp sensor, exhaust leak before the O2 sensor. Any of these could cause a rich condition.

Contrary to popular belief, you can diagnose most problems without just throwing parts at the problem.

PM me if you need any service manual info. I can probably help out.

 

Sounds like it needs more air, you definitely need a supercharger...

 

Checked Tech-Write-ups and searched Forum for MAF cleaning / write-up/pics. No can find....?

 

LOL!

Nah, it's sold already, I'm just waiting for my Legacy 2.5 GT Wagon to arrive to let it go.