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Carburettor models
Idle speed adjustment - single
carburettor engines
3 Ensure that all electrical loads are switched
off and, where applicable, the choke is
pushed fully in; if the car does not have a
tachometer (rev counter), connect one to the
engine, following its manufacturer’s
instructions. Note the idle speed, and
compare it with that specified.
4 The idle speed adjusting screw is situated
in various locations according to carburettor
type (see illustrations). It may be necessary
to remove a retaining clip and plastic cover to
gain access to the carburettor. Using a
suitable flat-bladed screwdriver, turn the idle
speed screw in or out as necessary to obtain
the specified idling speed as given in the
Specifications.
5 If the idle mixture CO content is not to be
adjusted, switch off the engine, disconnect
any instruments and refit all disturbed
components.
Idle speed adjustment - twin
carburettor engines
6 On twin carburettor installations, it is
necessary to balance the carburettors so that
the airflow through both is the same before
adjusting the idling speed. To do this a
vacuum gauge or carburettor synchronising
tool will be required.
7 Ensure that all electrical loads are switched
off and, where applicable, the choke is
pushed fully in; if the car does not have a
tachometer (rev counter), connect one to the
engine, following its manufacturer’s
instructions. Note the idle speed, and
compare it with that specified.
8 Remove the air cleaner assembly as
described in Chapter 4A.
9 If a vacuum gauge is being used,
disconnect the vacuum pipe and connect the
gauge to the vacuum pipe stub on the left-
hand carburettor (see illustrations).
Every 24 000 miles or 2 years 1•17
1
28.4a Typical idle speed adjusting screw
location (A) on the Solex PBISA
carburettors
28.4b Idle speed adjusting screw (1) and
mixture screw (2) location on the
Solex 32-34 Z2 carburettors
28.4c Idle speed adjusting screw location
(1) on the Weber 32 IBSH carburettors
28.4d Idle speed adjusting screw location (1) on the Weber 36 TLC carburettors
28.9a Adjustment points on the Solex twin carburettor installation
1 Mixture screw
2 Mixture screw
3 Idle speed screw
4 Vacuum pipe
5 Vacuum pipe
6 Synchronising screw
a Vacuum gauge pipe
b Vacuum gauge pipe