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Peugeot dealer, for diagnosis. On all single-
point fuel injection models, the idle speed and
mixture CO content is controlled by the
engine management ECU and cannot be
adjusted. If the idle speed and/or CO level is
incorrect, there is likely to be a fault in the
engine management system (see Chapter 4B).
Multi-point fuel injection models
Idle speed adjustment
21 Ensure that all electrical loads are
switched off. 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.
22 If adjustment is necessary, turn the air
screw (LE2-Jetronic) or idle speed adjustment
screw (LU2-Jetronic and Motronic M1.3) in
the throttle housing to obtain the specified
idling speed (see illustrations). If, on the LE2-
Jetronic system, the correct speed cannot be
obtained by means of the air screw, check
and adjust the throttle initial position as
described in Chapter 4C, Section 10.
Idle mixture CO level adjustment
Note: Adjustment of the idle mixture CO
content is only possible on the LE2-Jetronic
system. On The LU2-Jetronic and Motronic
M1.3 systems it is controlled by the fuel
injection system ECU.
23 The idle mixture (exhaust gas CO level) is
set at the factory, and should require no
further adjustment. If, due to a change in
engine characteristics (carbon build-up, bore
wear etc) or after a major overhaul, the
mixture setting is lost, it can be reset. Note,
however, that an exhaust gas analyser (CO
meter) will be required to check the mixture, in
order to set it with the necessary standard of
accuracy; if this is not available, the car must
be taken to a Peugeot dealer for the work to
be carried out.
24 If an exhaust gas analyser is available,
follow its manufacturer’s instructions to check
the exhaust gas CO level. If adjustment is
required, prise out the tamperproof cap on the
airflow sensor and use an Allen key to adjust
the mixture (see illustration). Turn the screw
in to richen the mixture and out to weaken it.
25 Blip the throttle two or three times and
then recheck that the idle speed and mixture
is correct.
26 When adjustments are complete,
disconnect the test equipment, and fit a new
tamperproof plug to the mixture adjustment
screw.
29 Emissions control systems
check
1
1 Details of the emissions control system
components are given in Chapter 4D.
2 Checking consists simply of a visual check
for obvious signs of damaged or leaking
hoses and joints. On engines incorporating a
breather filter in the oil filler cap, this should
be removed and cleaned, or renewed if it is
particularly contaminated.
3 Detailed checking and testing of the
evaporative and/or exhaust emissions
systems (as applicable) should be entrusted
to a Peugeot dealer.
30 Road test
1
Instruments and electrical
equipment
1 Check the operation of all instruments and
electrical equipment.
2 Make sure that all instruments read
correctly, and switch on all electrical
equipment in turn to check that it functions
properly.
Steering and suspension
3 Check for any abnormalities in the steering,
suspension, handling or road “feel”.
4 Drive the vehicle, and check that there are
no unusual vibrations or noises.
5 Check that the steering feels positive, with
no excessive “sloppiness”, or roughness, and
check for any suspension noises when
cornering, or when driving over bumps.
Drivetrain
6 Check the performance of the engine,
clutch, transmission and driveshafts.
7 Listen for any unusual noises from the
engine, clutch and transmission.
8 Make sure that the engine runs smoothly
when idling, and that there is no hesitation
when accelerating.
Every 24 000 miles or 2 years 1•19
1
28.22a Idle speed air screw adjustment on
the LE2-Jetronic fuel injection system
28.22b Idle speed adjustment screw (7) on the LU2-Jetronic and
Motronic M1.3 fuel injection systems
28.24 Mixture adjustment screw (2)