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System too lean, both banks #822918 12/17/03 10:23 PM
Joined: Nov 2001 Posts: 195 Mexico J jmatzick_dup1 OP CEG\'er
OP jmatzick_dup1 CEG\'er J Joined: Nov 2001 Posts: 195 Mexico	Tried search but it is offline for now. What could be some of the causes of P0171B & P0174B (system too lean bank 1 & 2) Thanks in advance, John 1998 ContourLX V6 ATX Cats Gutted+MIL Eliminators Grandma gave me the finger

Re: System too lean, both banks #822919 12/17/03 10:52 PM
Joined: Oct 2002 Posts: 2,408 R Rogerm60 Hard-core CEG'er
Rogerm60 Hard-core CEG'er R Joined: Oct 2002 Posts: 2,408	Dirty MAF Low fuel pressure Vacuum leaks Intake plenum leaks "Those who cannot remember the past are condemned to repeat it" -George Santayana

Re: System too lean, both banks #822920 12/18/03 12:40 AM
Joined: Nov 2001 Posts: 195 Mexico J jmatzick_dup1 OP CEG\'er
OP jmatzick_dup1 CEG\'er J Joined: Nov 2001 Posts: 195 Mexico	What are intake plenums? Also after changing the fuel filter, I used some liquid injector cleaner. Could that have caused some crap from the tank to restrict the flow from the fuel filter? 1998 ContourLX V6 ATX Cats Gutted+MIL Eliminators Grandma gave me the finger

Re: System too lean, both banks #822921 12/18/03 12:53 AM
Joined: Oct 2002 Posts: 2,408 R Rogerm60 Hard-core CEG'er
Rogerm60 Hard-core CEG'er R Joined: Oct 2002 Posts: 2,408	A plenum is a passage intended for airflow. The intake plenum is everything between the throttle body and the MAF. On Zetecs and my Crown Vic this includes a resonator to smooth airflow and dampen sound. The Duratec only has a small one consisting of the pleated rubber hose and the connections to the PCV system and IAC. Any unmetered air entering after the MAF will cause a lean condition. Fuel system cleaner is usually not a problem. If fuel pressure is suspected put a fuel pressure gauge on it. "Those who cannot remember the past are condemned to repeat it" -George Santayana

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