Fuel Injector Cleaning Procedure
1. Adjust the 3M regulator PN 08828 adjustment knob until an initial pressure setting of 5 psi below the specified vehicle fuel system pressure is reached (see Figure 7a).
^ For VG30/VG33 V6 engine the initial 3M regulator setting should be 29 psi (+/- 1 psi), (This 29 psi is 5 psi below VG30/VG33 operating fuel pressure specification of 34 psi.)
^ If you exceed the pressure setting you may not be able to adjust to a lower setting until the next step is completed.
2. Open the valve on the universal hose (see Figure 7b) and wait a few seconds for cleaner to fill and pressurize the vehicle's fuel rail.
^ Inspect for leaks from the tool. Verify fitting tightness and condition of internal seals/0-rings if a leak is found.
^ Re-adjust the pressure as needed to the specification noted above.
3. Start the engine and allow it to run at idle.
^ Verify that the 3M regulator pressure is still at the initial pressure previously set in step 1. You may need to fine-adjust the regulator as necessary.
IMPORTANT NOTES FOR ENGINE RUNNING CONDITION
A. THE TECHNICIAN MUST PERSONALLY MONITOR THE ENGINE RUNNING CONDITION DURING THE ENTIRE FUEL INJECTOR CLEANING PROCESS
B. For most incident injector cases, the engine should idle reasonably smooth while running on the cleaner and will run for 10 to 15 minutes (at engine idle) on each of the two cans.
C. Some incident injectors (low number of cases) might be so restricted that at first they generate engine misfire when running on the cleaner.
^ If this occurs, try to stop the misfire by adjusting the 3M pressure regulator to 5 - 10 psi higher than that specified in step 1.
^ If the engine continues to misfire at the higher pressure, try running at 2000rpm (under no load) to achieve a reasonable engine running condition without continued misfire.
D. When the fluid in the cleaner can is almost gone, the engine running condition will deteriorate into poor running condition, surge, or stop running altogether.
^ Also, the "Check Engine" light may come on or a DTC may be stored.
^ If this occurs, immediately stop the engine and install a second full can of cleaner or stop the cleaning process if you are nearing the end of the second can.
CAUTION:
Stop the cleaning process if a continuous engine misfire develops that cannot be corrected by either performing the steps listed above or is the result of a low can of cleaner. Sustained misfire may cause catalyst damage.
4. Close the valve (perpendicular 90 deg to hose) on the universal hose PN 08838 and turn the knurled adjustment knob of the regulator PN 08828 fully counterclockwise.
5. Start the engine and allow it to run until it stops running.
^ Then crank over the engine several times to release any cleaning fluid/nitrogen gas propellant left in the tool and fuel rail.
^ Turn the ignition switch off.
6. With a shop cloth wrapped around the can mating adapter PN 08927 to absorb any spray, depress the silver button (of the adapter) and remove the can from the regulator assembly PN 08828 (see Figure 8).
7. Un-screw the mating adapter PN 08927 from the used fuel injector cleaner can PN 08956. Then safely dispose of the used can of fuel injector cleaner.
8. Install a second can of fuel injector cleaner (with mating adapter installed on the new can) to the regulator and perform steps 1 through 5 of the "Fuel Injector Cleaning Procedure" (as previously done).
9. After the second fuel injector cleaner can is used up:
^ Close the valve (on the universal hose) and turn the regulator adjustment knob fully counterclockwise.
^ Release the pressure in the tool and fuel rail by running the engine until it stops running.
^ Then, crank the engine over several times until it cranks without starting.
^ Turn the ignition switch OFF.
^ Carefully remove the empty can per steps 6 and 7 of the "Fuel Injector Cleaning Procedure" above.
10. Release any pressure left in the fuel injector cleaner tool by holding a shop cloth over the end of the outlet (of the regulator assembly) and turning the adjustment knob several turns clockwise to open it.
^ Then open the valve (on the universal hose) slowly to completely release any remaining pressure safely into the shop cloth.
11. Remove the can mating adapter from the used can of cleaner and install it onto the regulator in preparation for storage of the 3M tool.
12. Remove the fuel supply line adapter and fuel supply line plug from the vehicle.
^ Wrap a shop cloth around the adapter/plug to absorb residual fluid as you disconnect them.
13. Remove the fuel return hose clamp tool and place it in the kit.
14. Re-install the vehicle's fuel supply line to the fuel rail.
15. Drain (into a shop rag or suitable container) any residual fluid from the fuel injector cleaning tool assembly and place the tool back in the kit.
16. Re-install the fuel pump fuse.
17. Turn the ignition switch ON.
18. Using CONSULT-II, erase any DTC codes stored in the ECM.
19. Start the vehicle and allow the engine idle to stabilize.
NOTE:
This may take several minutes.
20. Verify that there are no fuel leaks, especially where the fuel return hose was clamped.
21. Confirm the incident is resolved.