VW MKII A2 MK2 Golf Jetta Fox Service Manual - VAGLinks.com

4A•16 Fuel and exhaust systems - carburettor models
15.36 Float level checking diagram
a = 28 ± 1.0 mm b = 45° angle
33 If difficulty is experienced in making the
adjustment, check the pump seal and make
sure that the return check valve and injection
tube are clear.
Idle cut-off solenoid
34 When the ignition is switched on, the
solenoid should be heard to click, indicating
that the idle circuit has been opened.
35 If the solenoid is removed for testing, the
plunger must first be depressed by 3.0 to 4.0
mm before switching on the unit.
Weber 32 TLA
Float level
36 With the upper part of the carburettor
inverted and held at an angle of approximately
45°, the measurement “a” (see illustration)
should be as shown. The ball of the float
needle should not be pressed in against the
spring when making the measurement,
Idle speed and mixture
37 The procedure for checking and adjusting
the idle speed and CO content are basically
the same as given for the Pierburg 31 PIC-7
carburettor. Refer to the accompanying
illustrations for the location of adjustment
screws and to the Specifications for settings.
(see illustrations).
Idle speed boost valve
38 The idle speed boost valve is identical to
the unit on the Pierburg 1B3 carburettor.
15.40 Choke valve gap adjustment
1 Fast idle adjustment screw
2 Cam 3 Pull rod
15.37a Idle speed adjusting screw (A) -
pre June 1985
Choke valve gap (pull-down)
39 Remove the choke cover.
40 Place the fast idle speed adjusting screw
on the highest step of the cam (see
illustration). The manufacturer’s original
instruction was to press the pull rod in the
direction of the arrow shown, then to check
that the choke valve gap is 2.5 + 0.2 mm. As
from April 1987 however, this instruction is
revised and it is now necessary to use a
vacuum pump to apply 300 mbar vacuum on
the pull-down unit. The choke valve gap in
this case must be 2.0 + 0.2 mm.
41 Adjustment is made on the screw at the
end of the pull-down device. Ensure that the
spring “2” (see illustration) is not
compressed when making the check.
Idle cut-off valve
42 To check the cut-off valve, apply battery
voltage. The valve must be heard to click
when voltage is applied.
Fast idle speed
43 Before carrying out this check, ensure
that the ignition timing and manual idling
adjustments are correct. The engine should
be at normal operating temperature.
44 Remove the air cleaner.
45 Plug the temperature regulator
connection.
46 Connect the tachometer.
47 Remove the choke cover and set the fast
15.37b Idle speed adjusting screw (A) -
from July 1985
15.37c Mixture (CO content) adjusting
screw (B)
idle speed adjusting screw on the second
highest step on the cam (see illustration).
48 Tension the operating lever with a rubber
band so that the choke valve is fully open.
49 Without touching the accelerator pedal,
start the engine, which should run at the fast
idle speed specified.
50 Adjust the screw as necessary.
Choke valve gap (wide open kick)
51 Remove the air cleaner.
52 Fully open the throttle and hold it in this
position.
53 Press the lever (1) upwards (see
illustration).
54 Check the gap with a twist drill. The gap
should be as specified. If necessary, adjust by
bending the lever (see illustration).
15.41 Checking choke valve gap (pull-down) 15.47 Adjusting fast idle speed
1 Twist drill
2 Spring
3 Adjusting screw
1081 VW Golf & Jetta
1 Fast idle adjusting screw
2 Cam 3 Rubber band