Procedure

Figure 1 Acceleration Enrichment Switch Model 107:

Figure 2 Acceleration Enrichment Switch Model 126:

1. Remove air filter.

2. Install the acceleration enrichment switch (100) on the coolant expansion tank bracket, using bracket (1), a speed nut and sheet metal screw (Figure 1 and Figure 2).

Figure 3 - Vacuum Diagram:

3. Connect vacuum lines (according to vacuum diagram, Figure 3).

a. Vehicles, model years 1981/1982

Connect vacuum line (3) to connection (4) on intake manifold (serves cylinder no. 5, Figure 3).

b. Vehicles, model years 1983/1984

Cut through the black vacuum line (2) and connect with T-fitting (5). Connect vacuum line (3) from the T-fitting to the enrichment switch and reroute under the air and fuel lines. The length of the vacuum line is approximately 700 mm (Figure 3).
1 Bracket
2 Vacuum line
3 Vacuum line
4 Vacuum connection
Cylinder no. 5 (M.Y. 1981/1982)
5 T-fitting
9 Vacuum restrictor
19 Temperature switch 16~C
(Engine oil)
37 Thermovalve
100 Acceleration enrichment switch
a To main wiring harness
b To ignition distributor
c To check valve for air injection
W2 Ground, right front
(at headlamp assembly)

Figure 4 - 19 Temperature switch 16~C:

4. Pull plug connector from 16~C oil temperature switch (19, Figure 4).

Figure 5 - Wiring Diagram:

5. Connect the additional wiring harness to the 16~C temperature switch and the main wiring harness (Figure 5). Attach the ground wire to ground (W2 - at the head lamp assembly). Secure the additional wiring harness by tying to the main harness.
19 Temperature switch 16~C
(Engine oil) 100 Acceleration enrichment switch
a To main wiring harness
W2 Ground, right front
(at headlamp assembly)
W5 Engine ground

Figure 6 - Thermovalve & Vacuum Restrictor:

6. Replace the 50~C thermovalve (37) for acceleration enrichment with the 70~C thermovalve part no. 000 140 80 60 (Figure 6).

7. Replace vacuum restrictor (9) green/black/white with the new vacuum restrictor part no. 001 140 38 60 green/red/white (Figure 6).

NOTE: The I.D. of the restrictor was changed from 0.5 mm to 0.13 mm.

Figure 7 - Spring & Bimetallic Spring:

8. Check the initial fuel control pressure at +20~C (workshop temperature), the nominal value should be 1.8 - 2.2 bar gauge pressure. For other ambient temperature/pressure values, refer to the respective control pressure chart (microfiche, Combustion I - CIS, job no. 07.3-120 [USA version]).

If the initial control pressure is at the upper tolerance limit, adjust the pressure to the lower tolerance level by carefully tapping post (1) into the housing. This applies additional pressure on spring
(72) via the bimetallic spring (74) and the cold start control pressure is lowered (Figure 7).
CAUTION! If post (1) is tapped in too far (control pressure below limit), the enrichment compensator has to be replaced and warranty is voided.
10. Check the pressure during the warmup period, which should amount to 3.4 bar within 2-4 minutes, with an electrical consumers switched off and a minimum battery voltage of 12 V.

NOTE: The control pressure should not exceed 3.8 bar gauge pressure at engine operating temperature.

11. Continue to run engine to check for coolant and fuel leaks.

12. Install air filter.