4B
Chapter 4 Part B:
Fuel system - fuel injection engines
General
System type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rover/Motorola Modular Engine Management System, using ECU-
controlled single-point injection (MEMS-Spi) and speed/density
method of airflow measurement
Fuel system data
Fuel pump type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electric, immersed in fuel tank
Fuel pump regulated pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 bar ± 4%
Injector and pressure regulator unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . JZX 3300
Throttle potentiometer voltage:
Throttle closed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 1 volt
Throttle open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 to 5 volts
Idle speed - nominal value, for reference only . . . . . . . . . . . . . . . . . . . . 850 ± 25 rpm
Idle mixture CO % . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5% maximum
Recommended fuel
Minimum octane rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 RON unleaded only
Torque wrench settings Nm lbf ft
Fuel pump nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6
Throttle body assembly nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7
Injector housing fuel pipe union nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 18
Injector housing fuel pipe adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 18
Injector housing screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4
Inlet air temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5
Manifold retaining nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 16
Brake servo vacuum hose union bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 37
Fuel tank breather two-way valve nuts . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6
Accelerator cable - removal, refitting and adjustment . . . . . . . . . . . 4
Accelerator pedal - removal and refitting . . . . . . . . . . . . . . . . . . . . . 5
Air cleaner air temperature control system - general information,
testing and component renewal . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Air cleaner assembly - removal and refitting . . . . . . . . . . . . . . . . . . . 2
Air cleaner element renewal . . . . . . . . . . . . . . . . . . . . . .See Chapter 1
Fuel filter renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .See Chapter 1
Fuel gauge sender unit - removal and refitting . . . . . . . . . . . . . . . . . 10
Fuel injection system - testing and adjustment . . . . . . . . . . . . . . . . . 12
Fuel injection system components - removal and refitting . . . . . . . . 13
Fuel pump - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Fuel system - depressurisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Fuel system - pressure check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Fuel tank - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
General information and precautions . . . . . . . . . . . . . . . . . . . . . . . . 1
Inlet manifold - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . 15
Inlet manifold PTC heater - general information and component
renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Underbody and fuel/brake line check . . . . . . . . . . . . . . .See Chapter 1
Underbonnet check for fluid leaks and hose condition . .See Chapter 1
Unleaded petrol - general information and usage . . . . . . . . . . . . . . . 11
4B•1
Specifications
Contents
Easy, suitable for
novice with little
experience
Fairly easy, suitable
for beginner with
some experience
Fairly difficult,
suitable for competent
DIY mechanic
Difficult, suitable for
experienced DIY
mechanic
Very difficult,
suitable for expert DIY
or professional
Degrees of difficulty
5
4
3
2
1
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