Engines with carburetor
1. Remove the air filter housing (see Chapter 4).
2. Disconnect the cable from the bracket and the throttle drive lever.
Fig. 3.2 Throttle valve cable
Adjusting the bracket
3. Before adjusting the valve cable, it is necessary to adjust the position of the bracket.
4. Straighten the tongues of the lock washer and unscrew the bracket mounting bolts. Install a new lock washer, tighten the bolts.
5. Make the gauge shown in Figure 3.5.
Fig. 3.5 Adjusting the position of the throttle valve bracket
6. Install the gauge as shown in Figure 3.5.
7. Adjust the position of the bracket (a gap of up to 0.3 mm is allowed, caliber deflection is not allowed). Make sure there is no deflection of the gauge when tightening the bolts.
Adjusting the throttle valve cable
8. Check the free play of the cable (see Chapter 4).
9. Start the engine and warm it up until the cooling fan comes on.
10. Adjust the idle speed (see Chapter 1).
11. Turn off the engine.
12. Disconnect the cable from the valve control lever and from the bracket on the box (see fig. 3.2).
13. Disconnect the vacuum hose from the damper, connect the vacuum pump and apply vacuum.
Fig. 3.13 Connecting the vacuum pump to the damper
14. Hang a weight of approximately 700 grams from the gas pedal. Lift the pedal and release it. This weight should select the free play of the cable
15. Secure the cable in the engine compartment as shown in Fig. 3.15.
Caution: Do not allow the cable to touch the battery terminals.
Fig. 3.15 Laying the throttle valve cable for adjustment
16. Measure the distance X between the end of the cable and the lock nut A. Compare the measurement result with the specification data and adjust the distance X if necessary.
Fig. 3.16 To measure the distance X of the cable
17. Insert the end of the cable into the slot in the lever. Make sure that the cable is not twisted or kinked. Insert the cable into the bracket and tighten nut B.
Check that the cable moves freely when the pedal is depressed.
18. Remove the weight from the gas pedal and check the amount of free play of the valve drive lever.
Fig. 3.18 Measuring the valve lever free travel
19. Start the engine and check the synchronicity of the carburetor and valve cable: the valve lever should begin to move exactly at the moment the engine begins to accelerate.
- a) if the lever starts to move before the engine starts to accelerate, turn nut A counterclockwise;
- b) otherwise, everything is the other way around. Fuel injection engines.
20. Make sure that the throttle cable free play is correct (see Chapter 4).
21. Start the engine and warm it up.
22. Adjust the idle speed (see Chapter 4).
23. If you have a CIVIC or CRX produced since 1989 or a Wagon produced since 1990, disconnect the vacuum hose from the damper, connect a vacuum pump and apply vacuum to the damper.
Fig. 3.23 Connecting the vacuum pump to the damper
24. Loosen nuts A and B of the valve drive cable on the box bracket (see fig. 3.2).
25. Check the amount of free play of the cable by pressing the valve drive lever down until it stops. Fix the lever in this position and rotate the throttle drive sector (see fig. 3.23): there should be no free play.
26. To adjust the free play of the cable, turn nut A until resistance to rotation of the throttle drive sector appears.
27. To check the adjustment made, rotate the throttle drive sector, releasing the valve drive lever. The lever should start moving at the same moment as the sector.
28. With the help of an assistant, check that the cable moves freely without jamming.