Automotive fuel injectors fall into two categories:
electronically actuated solenoids or hydraulically
operated. Some gasoline applications use hydraulic
injectors however typically you will only find them in
diesel engines. For our purposes here, we’ll focus on
electronically actuated fuel injectors.
ELECTRONIC FUEL INJECTORS
Electronically actuated fuel injectors are solenoids
that spray a precise amount of fuel into the
combustion chamber to mix with the air. Modern
engines use a high-pressure multiport fuel injection
system where injectors are positioned in the intake
manifold with the nozzle ends directly above the
intake valve port. Prior to multiport fuel injection
design, low-pressure throttle body fuel injection
systems (a.k.a. single point injection) were used
that evolved from carbureted fuel systems.
A fuel injector contains a pintle that closes off an
orifice at the nozzle end (Figure 1). When electric
current is supplied to the injector, the armature and
needle move a short distance against a spring,
allowing fuel to flow out the orifice. Because the
fuel is under high pressure, a fine spray is developed
in the shape of a hollow cone. The spraying action
atomizes the fuel, adding to the air entering the
combustion chamber.
The injectors are energized individually in a sequential
order by the Powertrain Control Module (PCM).
A few other devices the PCM regulates include:
ignition timing, air/fuel ratio, emission control
devices, cooling fan, charging system and idle speed.
Over time, and depending on fuel and air quality (dirt),
fuel injectors begin to drip rather than spray. To run
efficiently, fuel injected engines require a constant
flow of pressurized fuel. When fuel injectors become
clogged, this impacts the vehicles performance,
driveability and fuel economy. Problems such as
hesitation, power loss, stalling and dieseling can be
caused by fuel injection problems. However a number
of other circumstances can cause the aforementioned
symptoms.
SERVICE
Sometimes fuel injectors need to be replaced.
They either fail or they’re too badly clogged to be
“driven clean” with cleaning solutions added to the
fuel. Mopar offers fuel injectors that are O.E quality
and designed specifically for Chrysler, Jeep® or
Dodge vehicles.
| Fuel Injector Part # | MYI | MYO | Per Vehicle | Engine | Vehicle application |
|---|---|---|---|---|---|
| 53031740AA | 2000 | 2003 | 6 | 3.9L | Ram Van, Dakota |
| 8 | 5.9L | Ram Pick-Up, Durango | |||
| 04861047AB | 1998 | 2000 | 6 | 3.3L FFV | Minivan |
| 04861454AA | 2001 | 2007 | 6 | 3.3L | Minivan |
| 04891345AA | 2001 | 2004 | 4 | 2.4L | Stratus, Sebring Sedan, Neon, PTCruiser, Minivan |
| 53031099 | 2002 | 2004 | 6 | 3.7L | Durango, Jeep Liberty |
| 04669772 | 1998 | 2000 | 4 | 2.0L SOHC | Breeze, Neon |
| 04591756AC | 2001 | 2004 | 6 | 2.7L | Stratus, Sebring Sedan, Intrepid, Concorde |
| 04591986AA | 2004 | 2006 | 6 | 2.7L | Sebring |
| 2005 | 2006 | 3.5L | Pacifica | ||
| 2005 | 2006 | 2.7L & 3.5L | Chrysler 300, Magnum, Charger | ||
| 04669772 | 1998 | 2000 | 4 | 2.0L | Neon, Sebring Conv., Cirrus, Stratus |
