DESCRIPTION AND OPERATION
Fuel Injected Engines
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.
The multiport fuel injection system (MFI) is classified as a multi-point, pulse time, speed density control, fuel
injection system. Fuel is metered into each intake port in a sequential firing order. Fuel injectors pulse to
follow engine firing order in accordance with engine demand through fuel injectors mounted on a tuned
lower intake manifold.
The powertrain control module (PCM) (12A650) accepts inputs from various engine sensors to compute the
required fuel flow rate necessary to maintain a prescribed air/fuel ratio throughout the entire engine
operational range. The powertrain control module then outputs a command to the fuel injector nozzle tips
(9E527) to meter the appropriate quantity of fuel.
The powertrain control module also determines and compensates for the age of the vehicle and its
uniqueness. The powertrain control module will automatically sense and compensate for changes in altitude
(i.e., from sea level to mountains) and will also permit push-starting the vehicle should it become necessary
(manual transmission only).
Section 10-01: Fuel Tank, Filters, Lines and
Electric Fuel Pump
1997 Aerostar, Ranger, Equipped with 2.3L, 3.0L, and 4.0L
Gasoline Engines Workshop Manual
Page 1 of 1
1997 Aerostar/Ranger
2011-04-29
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKA1001.HTM~gen~ref.HTM
