- Jan 3, 2013
- 17
Looking for some help with an ongoing and unresolved issue. This started 6-9 months ago and has been the same issue and symptoms since.
Issues/symptoms:
Intermittent MIL - will come on/go off every 3-6 run cycles.
P0171 - Lean bank 1
No other powertrain codes
LTFT is consistently +12-20% (adding fuel)
Occasional minor startup and idle stumble. Very minor. No other drivability issues. Will run full load, full RPM without hesitation
I have smoke tested the intake system twice. No sign of leaks. Cleaned throttle body. Replaced intake manifold gaskets. Replaced PCV hoses. Replaced fuel tank cap. Both O2 sensors and all spark plugs have been replaced recently.
Current thoughts:
Low fuel pressure?
Exhaust side air leak?
I am out of ideas about what is causing this lean condition.
Thank you!
Issues/symptoms:
Intermittent MIL - will come on/go off every 3-6 run cycles.
P0171 - Lean bank 1
No other powertrain codes
LTFT is consistently +12-20% (adding fuel)
Occasional minor startup and idle stumble. Very minor. No other drivability issues. Will run full load, full RPM without hesitation
I have smoke tested the intake system twice. No sign of leaks. Cleaned throttle body. Replaced intake manifold gaskets. Replaced PCV hoses. Replaced fuel tank cap. Both O2 sensors and all spark plugs have been replaced recently.
Current thoughts:
Low fuel pressure?
Exhaust side air leak?
I am out of ideas about what is causing this lean condition.
Thank you!