The C9 engines use the Hydraulic Electronic Unit Injector (HEUI) for fuel injection. The HEUI eliminates many of the mechanical components that are used in a pump-and-line system. The HEUI provides increased control of the timing and increased control of the fuel air mixture. The timing advance is achieved by precise control of the unit injector timing. Engine rpm is controlled by adjusting the injection duration. A special pulse wheel provides information to the Electronic Control Module (ECM) for detection of cylinder position and engine rpm.
The engine has built-in diagnostics in order to ensure that all of the components are operating properly. An electronic service tool can be used to read the numerical code of the faulty component or condition. Intermittent faults are logged and stored in memory.
The engine's ECM will automatically provide the correct amount of fuel in order to start the engine. Do not hold the throttle open while the engine is cranking. If the engine fails to start in twenty seconds, release the starting switch. Allow the starting motor to cool for two minutes before using the starting motor again.
| NOTICE |
|---|
|
The optional automatic ether injection system is the only starting fluid system that is recommended. Excessive starting fluid can cause piston and ring damage. Use starting fluid for cold starting purposes only. |
Starting the engine and operation in cold weather is dependent on the type of fuel that is used, the oil viscosity, and other optional starting aids. For more information, refer to the Operation and Maintenance Manual, "Cold Weather Operation" topic (Operation Section).