1380 Rover 800 Series Remake
4E
Torque wrench settings Nm lbf ft
Oxygen sensor:
4-cylinder engines with sensor in front pipe . . . . . . . . . . . . . . . . . . . . 20 15
4-cylinder engines with sensor in manifold . . . . . . . . . . . . . . . . . . . . 55 41
V6 engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 33
Air suction valve pipe nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 16
Air suction valve pipe bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9
EGR valve nuts and bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 16
Chapter 4 Part E: Fuel and exhaust systems –
Emissions control systems
Catalytic converter - general information and precautions . . . . . . . . 3
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Emissions control systems - testing and component renewal . . . . . 2
Engine compartment wiring check . . . . . . . . . . . . . . . . .See Chapter 1
Exhaust system check . . . . . . . . . . . . . . . . . . . . . . . . . . .See Chapter 1
Positive Crankcase Ventilation (PCV) system check and filter
cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .See Chapter 1
Underbonnet check for fluid leaks and hose condition . .See Chapter 1
4E•1
Specifications
Contents
1 General information
1 To minimise pollution of the atmosphere
from incompletely-burned and evaporating
gases, and to maintain good driveability and
fuel economy, a number of emissions control
systems are used on later vehicles covered by
this manual. They include the following:
(a) The engine management system
(comprising both fuel and ignition sub-
systems) itself.
(b) Crankcase emissions control.
(c) Evaporative emissions control system.
(d) Exhaust emissions control (air injection
system, exhaust gas recirculation system,
catalytic converter).
2 Before assuming an emission control
system is malfunctioning, check the fuel and
ignition systems carefully (see the earlier Parts
of this Chapter, and Chapter 5). The diagnosis
of most emission control devices requires
specialised tools, equipment and training. If
checking and servicing become too difficult,
or if a procedure is beyond the scope of your
skills, consult your Rover dealer or other
specialist. Note: The most frequent cause of
emissions problems is simply a loose or
broken electrical connector or vacuum hose,
so always check the electrical connectors and
vacuum hoses first.
3 Pay close attention to any special
precautions outlined in this Chapter. It should
be noted that the illustrations of the various
systems may not exactly match the system
installed on your vehicle, due to changes
made by the manufacturer during production
or from year-to-year.
Crankcase emissions control
4 To reduce the emissions of unburned
hydrocarbons from the crankcase into the
atmosphere, a Positive Crankcase Ventilation
(PCV) system is used whereby the engine is
sealed and the blow-by gasses and oil vapour
are drawn from inside the crankcase, through
an oil separator, into the inlet tract to be
burned by the engine during normal
combustion.
5 Under conditions of high manifold
depression (idling, deceleration) the gasses
will be sucked positively out of the crankcase.
Under conditions of low manifold depression
(acceleration, full-throttle running) the gasses
are forced out of the crankcase by the
(relatively) higher crankcase pressure; if the
engine is worn, the raised crankcase pressure
(due to increased blow-by) will cause some of
the flow to return under all manifold
conditions.
Evaporative emissions control
6 To minimise the escape into the
atmosphere of unburned hydrocarbons, an
evaporative emissions control system is fitted
to models equipped with a catalytic converter.
The fuel tank filler cap and vents are sealed
and a charcoal canister is mounted in the
engine compartment to collect the petrol
vapours generated in the tank when the car is
parked. It stores them until they can be
cleared from the canister via the purge valve
into the inlet tract, to be burned by the engine
during normal combustion.
7 To ensure that the engine runs correctly
when it is cold and/or idling, and to protect
the catalytic converter from the effects of an
over-rich mixture, the purge valve is not
allowed to open until the engine has warmed-
up, and is under load; the valve is then
opened to allow the stored vapour to pass
into the inlet tract.
8 On 4-cylinder engines the vacuum supply
to operate the purge valve is regulated by a
purge control valve solenoid which itself is
under the control of the ECU. The solenoid is
mounted either separately within the engine
compartment or, on later models, directly on
top of the charcoal canister.
9 On V6 engines the vacuum supply to the
purge valve is regulated by the constant
vacuum control valve (under ECU control) and
by a thermostatic valve which is opened or
closed depending on coolant temperature.
Exhaust emissions control
10 To minimise the amount of pollutants
which escape into the atmosphere, some
models are fitted with a catalytic converter in
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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