Contents: Frame ⇊ Throttle damper ⇊
Frame
Control (only for multipoint injection)
1. There is a vacuum hose on top of the housing that connects the housing to the fuel vapor accumulator. Disconnect it and install a pressure gauge in its place.
2. Start the engine and warm it up to operating temperature (the fan should start twice). The pressure gauge should not show a vacuum.
3 Open the throttle valve slightly, the pressure gauge should show a vacuum.
4. Stop the engine and check the adjustment of the cable and the smooth opening of the throttle.
5. If the cable or valve is sticking, clean the valve shaft.
6. If flushing does not solve the problem, replace the housing.
Replacement
8. Disconnect the negative battery cable. Relieve the fuel pressure in the system (see Section 2).
9. Remove the air duct between the air filter and the throttle body housing (in case of two-point injection, remove the filter housing).
10. Label and disconnect the vacuum hoses.
11. Disconnect the throttle actuator cable (see Section 8) and, if installed, the automatic transmission valve control cable (see Chapter 7B).
12. Disconnect the coolant passage hoses from the housing (only for multipoint injection). In case of two-point injection, disconnect the fuel hoses from the pressure regulator and the throttle body.
13. Unscrew the four mounting nuts and remove the housing.
Fig. 13.13 Assembling the throttle body:
1 - body;
2 - gasket.
14. Installation is carried out in the reverse order of removal. Adjust the throttle cable and the automatic transmission valve drive cable (see Chapter 7B).
Throttle damper
Models from 1995 to 1997
15. The shock absorber slows down the closing of the valve.
Fig. 13.15 Throttle Damper Assembly
16. Slowly open the valve until the shock absorber rod extends to its maximum length.
17. Release the damper drive lever and record the time until the lever touches the limiting screw. This time should be in the range of 0.25-2 sec.
- a) if the closing time is more than 2 sec. replace the shock absorber control valve;
- b) If the shock absorber rod does not extend, check for bending, leaks, or a clogged vacuum hose. If there is no visible damage, replace the shock absorber.
Models since 1988
18. Start the engine and warm it up.
19. Connect the tachometer according to the manufacturer's instructions.
20. Disconnect the vacuum hose from the shock absorber and measure the engine speed. It should be within 2000-3000 rpm.
21. If the rotation speed is too high, adjust it by bending the tab on the throttle lever.
Fig. 13.21 Adjusting engine speed by bending the drive lever ear
22. If the engine speed does not change after disconnecting the vacuum hose, connect a pressure gauge and check for vacuum. If there is no vacuum, check the hose and replace it if necessary.
23. If there is vacuum but the engine speed does not change, replace the shock absorber.
24. Adjust the idle speed (see Chapter 1).