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barry1982 · 04-11-2018, 10:00 PM

Update: I tested the fuel pressure... and it's great holding at almost 60 PSI.
Cleaned the Mass Air sensor with Mass air sensor cleaner. Started truck, and let idle until temp was approx. 1/4 on gauge. The truck ran good cold, but once it warmed up, stopped again. Will not start. Seems to only start cold. Fuel pressure remained at 60 even after it stopped.
Plugged in code reader, got a stored code P0171. (lean) . That's where I'm at Gentlemen. Any ideas?

04-11-2018, 10:00 PM	#8
barry1982 Registered User Join Date: Oct 2015 Location: Waskatenau, Alberta Posts: 259	Re: 2005 gmc 1500 5.3 z-71 Update: I tested the fuel pressure... and it's great holding at almost 60 PSI. Cleaned the Mass Air sensor with Mass air sensor cleaner. Started truck, and let idle until temp was approx. 1/4 on gauge. The truck ran good cold, but once it warmed up, stopped again. Will not start. Seems to only start cold. Fuel pressure remained at 60 even after it stopped. Plugged in code reader, got a stored code P0171. (lean) . That's where I'm at Gentlemen. Any ideas?