Interestingly, most of the codes you listed contradict each other. However, I have a plan. The 171, 172, 174, and 175 all indicate both a lean and rich fuel mixture for both banks. That doesn't make sense. It should be one or the other. The 300 is likely caused by a fuel mixture issue and the 131 indicates a low voltage from bank 1 sensor 1. Now, the 2195 and 2197 are showing the oxygen sensors are stuck in the lean setting for both banks. So, I'm questioning if the rich codes were set first and now the vehicle is sticking in lean to compensate. Check out the diagrams (Below).
Here is where we need to start. I need to confirm fuel pressure. If the pressure is too high due to a faulty regulator, it will be dumping fuel causing this.
Here is a link that explains in general how it's checked:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Here are the directions and specifications specific to your vehicle. The attached pics correlate with the directions.
Fuel Pressure T-Adapter 3/8"
310-D252 or equivalent
image WARNING: Do not smoke, carry lighted tobacco or have an open flame of any type when working on or near any fuel-related component. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in serious personal injury.
image WARNING: Before working on or disconnecting any of the fuel tubes or fuel system components, relieve the fuel system pressure to prevent accidental spraying of fuel. Fuel in the fuel system remains under high pressure, even when the engine is not running. Failure to follow this instruction may result in serious personal injury.
image WARNING: Do not carry personal electronic devices such as cell phones, pagers or audio equipment of any type when working on or near any fuel-related component. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in serious personal injury.
image WARNING: Always disconnect the battery ground cable at the battery when working on an evaporative emission (EVAP) system or fuel-related component. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in serious personal injury.
image WARNING: When handling fuel, always observe fuel handling precautions and be prepared in the event of fuel spillage. Spilled fuel may be ignited by hot vehicle components or other ignition sources. Failure to follow these instructions may result in serious personal injury.
If servicing a 4.6L (3V) engine, remove the Evaporative Emission (EVAP) purge valve bracket bolt and position the bracket aside.
If servicing a 5.4L (3V) engine, remove the air intake resonator assembly bolt and loosen the clamp. Rotate the resonator upward until it stops.
Remove the fuel pressure relief valve cap.
Install the Fuel Pressure Test Kit onto the fuel pressure relief valve.
NOTE: It may take more than one key cycle to pressurize the fuel system.
Cycle the ignition key to the on position and wait 3 seconds to pressurize the fuel system. Check for leaks before starting the engine.
Test the fuel system pressure to make sure it is within the specified range. For additional information, refer to Specifications in this section.
NOTE: 4.6L (2V) shown, 4.6L (3V) and 5.4L (3V) similar.
NOTE: Open the drain valve slowly to relieve the fuel system pressure. This may drain fuel from the system. Place the fuel in a suitable container.
Upon completion of the fuel system pressure test, open the drain valve on the Fuel Pressure Test Kit and relieve the fuel system pressure.
Install the pressure relief valve cap.
Tighten to 6 Nm (53 lb-in).
If servicing a 4.6L (3V) engine, position the EVAP purge valve into place and install the bracket bolt.
Tighten to 10 Nm (89 lb-in).
If servicing a 5.4L (3V) engine, rotate the air intake resonator assembly into position and install the bolt.
Tighten to 10 Nm (89 lb-in).
6.2L (2V) engine
Release the fuel system pressure. For additional information, refer to Fuel System Pressure Release in this section.
Disconnect the fuel tube quick connect coupling. For additional information, refer to Quick Connect Coupling in this section.
Install the Fuel Pressure T-Adapter 3/8" and Fuel Pressure Test Kit in line between the fuel supply line and fuel rail.
NOTE: The Fuel Pump Control Module (FPCM) electrical connector was disconnected during the fuel system pressure release and must be reconnected to complete the Fuel System Pressure Test.
Connect the Fuel Pump Control Module (FPCM) electrical connector.
Connect the battery ground cable. For additional information, refer to Section 414-01 .
NOTE: It may take more than one key cycle to pressurize the fuel system.
Cycle the ignition key and wait 3 seconds to pressurize the fuel system. Check for leaks before starting the engine.
Test the fuel system pressure to make sure it is within the specified range. For additional information, refer to Specifications in this section.
NOTE: Open the drain valve slowly to relieve the fuel system pressure. This may drain fuel from the system. Place the fuel in a suitable container.
Upon completion of the fuel system pressure test, open the drain valve on the Fuel Pressure Test Kit and relieve the fuel system pressure.
All engines
NOTE: It may take more than one key cycle to pressurize the fuel system.
Cycle the ignition key to the ON position and wait 3 seconds to pressurize the fuel system. Check for leaks before starting the engine.
Let me know what you find. Also, let me know if you have checked for vacuum leaks and if there is a leak at the exhaust manifolds on the engine.
Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Monday, September 14th, 2020 AT 11:40 AM
