The 4.0 liter engine used in Jeep Cherokee, Wagoneer, and Comanche 1987 – 1990 model years is equipped with sequential multi-point fuel injection. This system has as many fuel injectors as it does cylinders. These injectors are mounted in the intake manifold near the cylinder head. The advantages of multi-point fuel injection are that all of the cylinders receive an equal amount of fuel, and the problem of fuel condensation and pudding is eliminated.
Engine operation is managed by a microprocessor controlled device called Electronic Control Unit (ECU). The ECU is a microcomputer that receives signals from engine subsystems. As a result of the inputs and the ECU’s operation of actuators, engine performance is controlled by the program residing in the ECU.
The following file outline detail information regarding 4.0L Multi-Point Fuel Injection System Diagnosis for Jeep Cherokee, Comanche and Wagoneer. This covers topics on:
Component location chart, fuel pump, fuel pressure regulator, fuel rail, quick connect coupling O ring replacement, electronic control unit, ECU inputs, map sensor, engine speed sensor, sync signal generator, thermistor, air temperature sensor, throttle position sensor, relays, engine crank signal, oxygen sensor, knock sensor, air conditioning select/request signal, gear indicator signal, fuel pump relay, power latch relay, fuel injectors, injection timing, ignition power module, EGR solenoid, idle speed stepper motor, air conditioning clutch relay, electric cooling fan, ECU on board diagnosis, mechanical, electrical and wiring schematic.
Get more info on Jeep Cherokee 4.0L Multi-Point Fuel Injection System Diagnosis (87 – 90) here – source: www.wagoneers.com
- 1990 jeep cherokee engine,multi point fuel injection system,multi point fuel injection,87 jeep comanche fuel relay,87 jeep comanche fuel injector remove,