Idle speed block (DZ engine)
1. Two way valve 1 (fig 3.29) increases engine speed when it falls below 700 rpm. The control unit is located under the panel.
2. Two-way valve II increases engine speed when the air conditioner is on.
3. To check control valve I with the adjustment screw, reduce the engine speed and check that the engine speed increases when it drops below 700 rpm. Now squeeze hose 1 (fig 3.29) and check for a drop in engine speed.
4. With the hose pinched, adjust the idle speed to the specified value, then unclench the hose. This will increase the engine speed to 1050 rpm, the valve will close and the speed will drop to normal idle speed.
5. To check control valve II, start the engine at idle, then squeeze the hose. The engine speed should not change. Turn on the air conditioner and repeat the test. This time the engine speed should drop.
Air flow meter plate
6. Remove the air duct from the airflow meter. Disconnect the high voltage wire from the ignition coil and ground it, turn on the starter for ten seconds.
7. Raise the plate and check that it has the same resistance over the full range of motion.
8. Check the dimension shown in fig. 3.30. If necessary, the position can be adjusted by bending the wiring clamps under the plate.
9. Plate free play should be 0.5-3.0 mm on DZ motor, and on KV/PS motors, free play should be maximum 2.1 mm.
Cold start valve and start fuel switch
10. Disconnect the high voltage wire from the ignition coil and ground it.
11. Disconnect the wiring from the cold start valve and connect the diode test lamp to the clamps in the connector.
12. Disconnect the wiring from the start fuel switch and ground the green/white wire clamp. Do not ground the red/black wire clamp.
13. Turn on the starter, the control lamp should light up.
14. Install the connector to the switch, leaving the green/white wire grounded.
15. Remove the cold start valve and point it into a glass beaker. Turn on the starter, the fuel from the valve should be sprayed in the form of an even cone.
16. Wipe the valve dry.
17. With the cold start valve in place but the wiring disconnected, connect the diode test light across the two connector clips.
18. Turn on the starter for ten seconds, the control lamp should light up for one to eight seconds, depending on the coolant temperature. liquids (for testing maximum temperature 30°C).
Enrichment cold acceleration
19. Cold acceleration enrichment works when the start fuel mode switch, diaphragm pressure sensor, and throttle switch are closed.
20. Follow the procedure described in points 11 and 12, then start the engine and set the idle speed. The control lamp should not light up.
21. Quickly open the throttle, the control lamp should light up briefly (by 0.4 seconds).
Diaphragm pressure sensor
22. Disconnect the electrical wiring from the pressure sensor (photo).
23. Start the engine and set the idle speed.
24. Connect an ohmmeter to the two clamps on the switch (photo), the resistance should be infinite, indicating that the contacts are open.
25. Open the throttle quickly, the resistance should drop momentarily.
Throttle switch
26. Disconnect the wire contact from the throttle switch and connect an ohmmeter with two clamps.
27. With the throttle closed, the resistance should be infinite.
28. Slowly open the throttle until you hear the switch contacts actuate. At this point, the resistance should be infinite, and the gap between the idle speed limiter and the throttle lever should be 0.2-0.6 mm. If necessary, adjust the switch.
Auxiliary pneumatic valve
29. Disconnect the high voltage wire from the ignition coil and ground it.
30. Disconnect the wiring contact from the auxiliary air valve and connect the diode control lamp across the connector pins.
31. Turn on the starter, the control lamp should light up.
32. Turn off the ignition and connect the tachometer.
33. Start the engine and set the idle speed.
34. Compress the hose between the auxiliary air valve and the intake manifold. The engine speed should decrease.
35. Reconnect the wiring and repeat the test with a warm engine. The engine speed should not change.
Warm-up valve
36. Disconnect the high voltage wire from the ignition coil and ground it.
37. Disconnect the wiring from the warm-up valve, connect the diode control lamp across the connector pins.
38. Turn on the starter, the control lamp should light up.
Basic throttle setting
39. The adjusting screw is factory set and does not normally require adjustment. If the adjustment has been violated, perform the following procedure.
40. Loosen the nut, unscrew the adjusting screw so that there is clearance between the screw and the stopper, then turn the screw clockwise until it touches the stopper. The point of contact is best fixed using a piece of thin paper laid between them. From this point, turn the screw further by half a turn. Apply locking fluid to the threads of the nut, then tighten the nut to prevent the screw from rotating.
41. Check up values of installations of idling after adjustment.
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