Rover 214 & 414 Service and Repair Manual - Rover club

4B•2 Fuel and exhaust systems - single-point fuel injection engines
Torque wrench settings
Fuel system
Nm lbf ft
Injector housing fuel pipe union nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 18
Injector housing fuel pipe adaptors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 18
Injector housing screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4
Throttle housing retaining nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 13
Fuel system pressure release bolt - models without catalytic converter12 9
Fuel pump retaining nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7
Vent valve and hose retaining nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7
ECU retaining nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7
Intake air temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5
Coolant temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 11
Inlet manifold nuts and bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 18
Inlet manifold support stay bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust system
25 18
Oxygen (lambda) sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 41
Exhaust manifold retaining nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 33
Exhaust manifold shroud screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust system flange nuts:
6 4
Manifold-to-front pipe joint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 37
All other joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 33
Exhaust front pipe mounting bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 11
1 General information and
precautions
General information
The fuel system consists of a fuel tank
mounted under the rear of the vehicle with an
electric fuel pump immersed in it, a fuel filter,
fuel feed and return lines and the throttle body
assembly (which incorporates the single fuel
injector and the fuel pressure regulator), as
well as the Engine Management Electronic
Control Unit (ECU) and the various sensors,
electrical components and related wiring. The
ECU fully controls both the ignition system
and the fuel injection system, integrating the
two in a complete engine management
system (see illustration). Refer to Chapter 5
for information on the ignition side of the
system.
The Rover/Motorola Modular Engine
Management System uses ECU-controlled
single-point injection (MEMS-SPi) and the
speed/density method of airflow
measurement. The whole system is best
explained if considered as three sub-systems
which are, the fuel delivery, air metering and
electrical control systems.
The fuel delivery system incorporates the
fuel tank with an electric fuel pump, which is
immersed in a swirl pot to prevent aeration of
the fuel, inside it. When the ignition is
switched on, the pump is supplied with
current via the fuel pump relay, under the
control of the ECU. The pump feeds petrol via
a non-return valve (to prevent fuel draining out
of the system components and back to the
tank when the pump is not working) to the fuel
filter and from the filter to the injector. Fuel
pressure is controlled by the pressure
regulator, which lifts to allow excess fuel to
1 Accelerator pedal
switch
2 Fuel cut-out inertia
switch
3 Fuel pump
4 Throttle
potentiometer
5 Fuel pressure
regulator
6 Injector
7 Stepper motor
8 Intake air temperature
sensor
9 Inlet manifold PTC
heater
10 Coolant
temperature
sensor
11 Distributor
12 Crankshaft sensor
13 Diagnostic connector
14 Engine management
ECU
15 Main relay
16 Fuel pump relay
17 Inlet manifold PTC
heater relay
18 Ignition HT coil
19 Lambda sensor -
models
equipped with
catalytic
converter
20 Lambda sensor relay -
models equipped with
catalytic converter
21 Purge valve (where
fitted)
22 Charcoal canister
(where fitted)
1.0 Fuel and ignition system components - MEMS-SPi
1689 Rover 214 & 414 Updated Version 09/97