Skylark L4-138 2.3L DOHC VIN D MFI QUAD 4 (1989)
Fuel Injector: Service and Repair
Fuel Injector Cleaning Procedure
PROCEDURE
NOTE: This is a GENERIC procedure and depending on which tester/cleaner is being used, this procedure may be different than the actual
procedure designated for use with the tester/cleaner. Always follow the procedure that is designated for the tester/cleaner being used.
1. Relieve the system pressure, refer to Fuel Delivery and Air Induction / Service and Repair / Fuel System Pressure Relief Procedure.
2. Disconnect the fuel supply line from the inlet of the fuel rail.
3. Attach the fuel supply line to the return line.
4. Plug the fuel return fitting at the fuel rail or connect to tester/cleaner depending on configuration.
5. Connect the fuel supply hose from the tester/cleaner to the fuel supply manifold.
6. Turn the tester/cleaner "ON". The tester/cleaner should run 10 minutes.
7. START the engine and check the fuel lines for leakage. If there is any sign of leakage, turn the vehicle and the tester/cleaner "OFF" and repair the
location where fuel is leaking. Then return to Step 6.
8. When the engine speed has stabilized, set the idle speed at 2000 rpm. Run the remainder of the 10 minute cycle to eliminate all the air in the fuel
supply hose and fuel rail.
9. Turn power switch "OFF" and disconnect power lines.
10. Disconnect cleaner supply hose from the fuel supply manifold.
11. Connect vehicle fuel lines. START engine and check for leaks. Lubricate O-rings prior to installation and ensure fuel lines are securely connected.