MAHLE RTI ESX-2 - Manual (Page 11)

Page 10
Port Fuel Injection (PFI) Cleaning Procedure
The following steps will circulate the cleaning mixture through the Port Fuel Injection System,
cleaning the fuel rail, injector screens and pressure regulator.
1. Verify that the Port Fuel Injection Setup section is complete.
2. Press and hold the Start button.
3. Turn the ESX Pressure Control regulator clockwise until the Fuel Pressure Gauge displays
at least 4 psi or the Cleaning Arrow LED stays illuminated. This will clean the PFI unit,
injector screens, fuel rail, and pressure regulator and filter any contaminants through the
ESX filtering system.
4. Release the Start button and continue to turn ESX Pressure Control regulator clockwise
until it is completely closed. Make a note of the Fuel Pressure gauge reading. This is the
true operating pressure of the vehicle pressure regulator without vacuum assist when the
engine is running at normal operating temperature.
5. Press the + button to increase or the - button to decrease the time on the ESX LED timer
display until the 10 minute LED is illuminated.
Caution: If a Leakdown test has not been performed, do not proceed with the following
steps. Refer to the Setup procedure for the correct instructions.
6. After time has expired on the rail cleaning process press the START button until the
pressure rises again.
7. Press the + button to increase or the - button to decrease the time on the ESX LED timer
display until the 30 minute LED is illuminated. Run time may be adjusted depending on the
condition of the vehicle fuel system.
8. Start the vehicle to begin the engine cleaning procedure. At this time if the vehicle is
equipped with a cold start injector you may use an injector pulser to energize the cold start
injector a few times to clean it.
9. When the time expires, the unit will automatically shut off and purge itself for five seconds.
This will shut off the engine and illuminate the PROCESS COMPLETE LED as well as
sound the buzzer. Turn the vehicle ignition OFF.
10. Turn the Pressure Control regulator counterclockwise to open it and press and hold the
FILL/PURGE button for five seconds to relieve pressure in the ESX Red Hose.
11. Disconnect loop adapter and use a shop rag at all connection points before disconnecting.
12. Disconnect the battery leads, hoses, and adapters. Reconnect all of the vehicle fuel lines.
Reinstall the vehicle fuel cap.
13. Start the vehicle and verify that there are no leaks in the fuel system.
14. Always test drive the vehicle for three miles or run at 3000 rpm for two to three minutes to
flush all RTI FUEL SYSTEM CLEANER out of the vehicle fuel and exhaust system.