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FIAT SPIDER 2000 User Manual

Page 34

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Ftief Injection System

General

This is an electronically controlled

intermittent low pressure injection

system.

The fuel is injected upstream of the
intake vaives by means of solenoid
injectors supplied at constant pressure.

Flow is controlled by means of varia-

tion in the opening time of the injectors.

The main factor controlling flow is
the direct measurement of drawn air

by a special sending unit which trans-
mits the most important information

for fuel metering to the electronic
control unit.

The system is also provided with a

certain number of measuring sensors

which provide the electronic control

unit with the information required to
optimize the composition of the mix-

ture in all engine operating conditions.

Exhaust Gas Emission Control
System

For the control of exhaust gas emis-

sions, the injection system is fitted with

an oxygen sensor {Lambda probe)

which measures the oxygen content of

the exhaust gases and transmits any
adjustment of the air-fuel mixture to

the control unit. It is thus possible

with the aid of a catalytic converter

fitted to the exhaust pipe, to reduce to

a minimum the harmful residues con-

tained in the exhaust gases.

Oxygen Sensor {Lambda probe)

Every 30,000 miles: Renew oxygen

sensor. An indicator on the
instrument panel lights up on
completion of 30,000 miles

(see page 7) signifying that the sen-

sor must be replaced.

To renew sensor proceed as follows:

— Disconnect probe cable A.

— Back off probe B from its seat C

on exhaust manifold.

— Fi 1 new probe lubricating threaded

part with anti-seize, ami-rust grease.

— Reconnect cable A.

— Press button to zero indicator.

I79H9

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