Solex PICT/PIC carburetors (VW Golf 1)

Adjustment of idle speed and CO content in exhaust gases is described in the chapter "Engine adjustment". Remove the air filter, then adjust the carburetor in the following order:

Adjusting high idle speed

1. Connect a tachometer to the engine (see chapter "Engine adjustment").

2. On 1.1 and 1.3 l engines (since August 1979) with manual choke, adjust the choke cable as described above.

3. Pull the air damper control knob out fully and push it back to the first detent position.

4. Open the air damper by hand by turning the damper shaft (figure W:9). Start the engine and note the high idle speed value on the tachometer.



5. If the value of increased idle speed goes beyond the specified limits (see section "Technical data"), remove (if available) safety cap and adjust the high idle speed by turning the throttle stop screw (A, figure W:9).

On engines with automatic choke, start the engine and set the throttle stop screw to the third stage of the high idle cam (A, figure W:10). If the high idle speed value is outside the specified limits (see section "Technical data"), remove the protective cap and adjust the idle speed by turning the limit screw. There should be a gap of at least 0.2 mm between the end of the limit screw and the high idle speed cam with the air damper fully open (B, figure W:10).

Air damper starting clearance

1. On Solex PIC carburetors with manual choke, pull the choke control knob all the way out until the high idle cam is in the highest position. Remove the bimetallic spring cover from the choke actuator housing

2. On Solex PICT carburetors with an automatic choke, remove the bimetallic spring cover with the water box from the automatic choke housing and close the choke.

3. Press the air damper relief device diaphragm rod until it stops against the diaphragm housing (figure W:11).



4. Check the gap size between the upper edge of the air damper and the wall of the mixing chamber using a drill shank of the appropriate diameter (A, figure W:11) — see section "Technical data".


5. Adjust the gap if it is not within the specified limits by turning the limit screw in the diaphragm housing (B, figure W: 11).

6. Replace the bimetallic spring cover. Make sure that the bimetallic spring engages with the air damper lever. The mark on the cover should align with the mark on the carburetor body.

Fuel shut-off valve

The electromagnetic shut-off valve of the fuel supply cut-off serves to close the bypass (bypass) channel of the idle speed when the ignition is turned off in order to prevent further operation of the engine (the so-called "anti-diesel"). The valve is screwed into the side surface of the carburetor body under the idle speed adjustment screws.

When the ignition is turned on, the valve operates with a clearly audible click. When removing the valve, the plunger should be recessed inward by 3-4 mm. If the valve does not work, replace it.

Throttle body heater

On models with 1.1/1.3 l engines (since July 1978) a carburetor with an electric heating element is installed, which serves to heat the throttle valve area. The heater is located under the air valve body next to the accelerator pump.

To test the heating element, disconnect its wire from the connector on the top of the carburetor, then connect a test light between the terminal of the heating element and the positive terminal of the battery. The light should light, otherwise replace the heating element.