WARNING: This procedure requires the use of an enriched propane kit. Do not start the procedure if this kit is not available to you. Make sure the propane bottle is full enough before starting work.
The mixture can also be determined with an exhaust gas analyzer or emission tester, but this equipment is hardly available at home. If this method is used, you must have access to the adjusting screw (screws) mixtures.
1. Put the car in position "PARK" or neutral, apply the parking brake and block the drive wheels. Start the engine and warm it up to normal temperature. Cooling fan (s) must run at least once.
2. Disconnect the vacuum hose from the air inlet control diaphragm and clamp the end of the hose.
3. Connect a suitable tachometer to the engine using the manufacturers instructions.
4. Check the idle speed by turning off all unnecessary consumers. If necessary, adjust the idle speed by turning the throttle stop screw.
5. Disconnect the air cleaner inlet tube from the air duct on the radiator bulkhead.
6. Insert the hose from the propane kit into the inlet tube about 10 cm.
Propane is a flammable gas. Do not smoke or work near open flames. Have a dry powder fire extinguisher handy.
7. With the engine idling, depress the button on top of the propane unit, then slowly open the control valve until maximum engine RPM is obtained. Engine speed should increase when propane injection starts.
Open the control valve slowly; if the engine is started too hard, the engine may stall.
8. Turnover x.x. engine should increase as follows:
- Accord 1984-85 with manual - at 100±25 rpm;
- Accord 1984-85 with automatic transmission - at 50±20 rpm;
- Accord 1986 with a mechanical box - at 35±20 rpm;
- Accord 1987-89 with manual - 50±20 rpm.
9. If rpm increase is within specification, remove propane, remove all test equipment, and reconnect any disconnected vacuum hoses. If RPM does not increase as needed, follow these steps. Switch off the ignition.
10. Disconnect the vacuum hose from the fast idle release. Pull the throttle cable out of the bracket.
11. Disconnect the carburetor nuts, washers and bolts securing the vacuum manifold. Lift the carburetor free from the frame, then tilt it back to access the throttle bracket screws.
12. Remove the regulator bracket. Remove the mixture screw cap from the Throttle adjuster bracket and then reinstall the bracket.
13. Install the carburetor, attach the vacuum hose to the fast idle release. Install the air cleaner.
14.Start the engine and warm it up to normal temperature.
15. Remove the air inlet control diaphragm vacuum hose and clamp the end of the hose. Reinstall the enriched propane kit and recheck the maximum RPM after propane delivery.
16. If the rpm is too low after propane enrichment, then the fuel mixture is too rich. Turn the mixture adjustment screw 1/4 turn clockwise and retest.
17. If the rpm is too high after propane enrichment, then the fuel mixture is lean. Turn the mixture adjustment screw 1/4 turn counterclockwise and retest.
18. Close propane control valve and recheck idle speed. Make sure engine is running at 2500 rpm. s for 10 seconds to stabilize idling.
19. After adjustment, remove propane enrichment kit, all test equipment, and reattach all vacuum hoses and air cleaner inlet tube.
20. If rpm is not adjusted to specification, recheck and adjust if necessary by turning throttle stop screw, then repeat steps 14-19.
21.Adjust the idler if necessary by turning the idler control screw.
22. If the car is equipped with air conditioning, make a second check with the air conditioner on. If necessary, adjust the speed by turning the adjusting screw on the idle speed diaphragm.