Trying to rule out a lot of things because I’m throwing a lean code (PO171)

I currently have 41 At idle with FPR connected

and 45 with FPR Disconnected

cant seem to find any vacuum leaks but gnna check that with a gauge too if fuel pressure seems to be set correctly

 

Service Manual spec shows 47-54psi (00-05) "with regulator vacuum hose disconnected" and 55-63psi (06-and later). See pages 11-145 and later. Not sure the pressure tolerance of the gauge you're using and you're only 2psi low if your method is the same as disconnecting the vacuum hose. (We don't know what engine you have.)

-- Chuck

 

Its a F22 Motor and the gauge is good for 100psi, do you think that 2psi would be enough to throw a code?

 

I should have asked what year engine -- there are two specs. 41psi if the spec is 55psi (2006 and later) is more likely to be lean enough to cause a problem.

-- Chuck

 

Lol. It’s a 2005. So I assume it’s within spec then? I’m waiting for a vacuum gauge to come in to check for any leaks as well, couldn’t manually find any so I figured I’d start checking the fuel first.