Engine Control Systems, Electronic

 WARNING: DO NOT SMOKE, CARRY LIGHTED TOBACCO, OR OPEN FLAME OF ANY TYPE WHEN WORKING ON OR NEAR ANY FUEL-RELATED COMPONENT. HIGHLY FLAMMABLE MIXTURES ARE ALWAYS PRESENT AND MAY BE IGNITED, RESULTING IN POSSIBLE PERSONAL INJURY.

Gasoline Engines

The multiport fuel injection SFI system is classified as a multi-point, pulse time, mass airflow, sequential fuel injection system. It is used in the following engine applications:

• all 5.0L
• all 4.9L
• 5.8L under 8,500 lb.
• California over 8,500 lb.
• California under 14,000 lb.

All other engine applications use the multiport fuel injection (MFI) system, which is classified as a multi-point, pulse time, speed density, fuel injection system.

Diesel Engine

The 7.3L diesel engine is classified as a multi-point, pulse time, speed density fuel injection system.

To maintain the required exhaust emission levels, the fuel metering system must be in proper operating condition and adjusted to the specifications listed in/on the following sources:

• The applicable section of the Powertrain Control/Emissions Diagnosis Manual.
• The applicable section of this Group.
• The Vehicle Emission Control Information (VECI) decal.

Additional engine performance checks are required to keep the exhaust emissions at the specified minimum pollutant level. Refer to Section 00-03 for these performance checks and their recommended intervals.

Always refer to the Master Parts List for parts usage and interchangeability before replacing any emissions-related components.

Always refer to the Master Parts List for parts usage and interchangeability before replacing a throttle body (9E926) or any component part of a throttle body.