CHAPTER 3 MI- 04 MAINTENANCE SCHEDULE RECOMMENDED MAINTENANCE SCHEDULE Suggested maintenance requirements for an engine equipped with an MI-04 fuel system are contained in this section. The owner should, however, develop his own maintenance schedule using the requirements listed in this section and any other requirements listed by the engine manufacturer. Test Fuel System for Leaks Inspect Engine for Fluid Leaks z Start the engine and allow it to reach operating temperatures. z Turn the engine off. z Inspect the entire engine for oil and/or coolant leaks. z Repair as necessary before continuing.
Inspect Vacuum Lines and Fittings z Visually inspect vacuum lines and fittings for physical damage such as brittleness, cracks and kinks. Repair/replace as required. z Solvent or oil damage may cause vacuum lines to become soft resulting in a collapsed line while the engine is running. z If abnormally soft lines are detected, replace as necessary. Inspect Electrical System Check Points Vacuum Lines z Obtain a leak check squirt bottle or pump spray bottle. z Fill the bottle with an approved leak check solution. z Spray a generous amount of the solution on the fuel system fuel lines and connections, starting at the storage container.
z Wait approximately 15-60 seconds then perform a visual inspection of the fuel system. Leaks will cause the solution to bubble. z Repair any leaks before continuing. z Crank the engine through several revolutions. This will energize the fuel lock-off and allow fuel to flow to the pressure regulator/converter. Apply additional leak check solution to the regulator/converter fuel connections and housing. Repeat leak inspection as listed above. z Check for loose, dirty or damaged connectors and wires on the harness including: Fuel lock-off, TMAP sensor, O2 sensor, Electronic throttle, Control Relays, Fuel Trim Valve, Acceleration Pedal, and Distributor sensor.
z Repair any fuel leaks before continuing. z Repair and/or replace as necessary. G420E/G424E Tier LP Engine Maintenance Schedule 30