View single post by 410customs
 Posted: Mon Sep 7th, 2020 02:02 pm
PM Quote Reply Full Topic


Joined: Wed May 2nd, 2018
Location: Panhandle IdahoUSA
Posts: 2129
Reputation Points: 5304
it is not your amount of idling, you should be able to idle for a week if you want to
Is this a 4 cyl? 3.0 or 4.0?

P0171 means a lean condition only in one bank, one side of the engine
Typically that usually rules out anything that effects both sides of the engine like the MAS, intake air leaks, etc since they would effect both sides, typically, not always. The Po174 code may not be far behind
Lean condition means the computer has seen more 02 in the exhaust on that bank then expected and it has already tried to correct it by adding more fuel, still the condition is lean. It has occurred enough times to set a code.

With those miles and the work you have done I would suspect:
failing injector
wiring at the 02 sensors you replaced (always good to go back and check the work you have done)
exhaust leak on bank 1 side
or failing pcv valve (but again that usually effects both sides)
Cleaning the MAS NEVER HURTS

"The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. 
There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. 
There could be a vacuum leak downstream of the MAF sensor 
Possible cracked vacuum or PCV line/connection 
Faulty or stuck open PCV valve 
Failed or faulty oxygen sensor (bank 1, sensor 1) 
Sticking/plugged or failed fuel injector 
Low fuel pressure (possible plugged/dirty fuel filter!) 
Exhaust leak between engine and first oxygen sensor

Read more at:

I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks