Port Fuel Injection (PFI) Cleaning Procedure
Follow these steps to circulate the cleaning mixture through the Port Fuel Injection unit to
clean the
fuel rail, injector screens, and pressure regulator.
1.
Verify
that
PFI Setup Steps 1-18
above have been completed before continuing
2.
Refer to the vehicle's service manual for the manufacturer's recommended PSI.
3.
Press and hold the
Start
button.
4.
Close
the
Pressure Adjust
regulator clockwise until the
Fuel Pressure
gauge on the
unit displays the vehicles operating pressure and the
Up Arrow
LED stays illuminated
without flashing. This will clean the PFI unit, injector screens, fuel rail, and pressure
regulator and filter the contaminants through the unit’s filtering system.
5.
Release
the
Start
button and continue to turn the
Pressure Adjust
regulator
clockwise until it is completely closed.
•
Make a note of the fuel pressure reading; this is the true opening pressure of the vehicle's pressure
regulator without vacuum assist when the engine is at normal operating temperature.
•
At this point, refer to appropriate Intake System Cleaning Procedure section for proper intake
cleaning, and Vacuum gauge connections in the vehicle diagnostics chapter.
6.
Press
the
button to increases the time, or the
▬
button to decreases the time until
the
Time
LED displays 10 minutes.
7.
After the 10 minutes has expired on the
Time
LED display, press the
Start
button
until the pressure rises to the previous system pressure, and release.
8.
Press
the
button to increases the time, or the
▬
button to decreases the time until
the
Time
LED display indicates 30 minutes. (Run time may be adjusted depending on
the condition of the vehicle’s fuel system.)
9.
Start the vehicle
to begin the fuel system cleaning process.
•
If the vehicle is equipped with a
Cold Start Injector
, you may use a
Injector Pulser
to energize the
Cold Start Injector
a few quick times during the run cycle to clean it.
