MotorVac CarbonClean System MCS 245 - Manual (Page 32)

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.