CARBURETOR - Checking and Adjusting Idle-rpm, Ignition Timing and Mixture Ratio (Models without catalyzer)
EF & EC-160prose procedureOn air conditioner equipped models, checks should be carried out with A/C "OFF".
Checking and Adjusting Idle-rpm, Ignition Timing and Mixture Ratio (Models without catalyzer)
CAUTION
a. Idle mixture ratio is adjusted at factory and requires no further adjustment. If it becomes necessary to adjust it, proceed with the following steps.
b. Do not attempt to screw the idle adjusting screw down completely. Doing so could cause damage to tip, which in turn will tend to cause malfunctions.
c. After adjusting idle speed and mixture ratio, be sure to check items below, and if necessary, adjust them.
(1) Fast idle adjustment
(2) Dash pot touch speed
PREPARATION
- 1Make sure that the following parts are in good order. • Battery • Ignition system • Engine oil and coolant levels • Fuses • E.C.U. harness connector • Vacuum hoses • Air intake system (Oil filler cap, oil level gauge, etc.) • Engine compression • Throttle valve
- 2On air conditioner equipped models, checks should be carried out while the air conditioner is "OFF".
- 3When measuring "CO" percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
- 4Turn off headlamps, heater blower, rear defogger.
- 5Keep front wheels pointed straight ahead.
- 6Make the check after the radiator fan has stopped.
- 7Use idle adjusting screwdriver when adjusting idle adjusting screw.
SMA075C
WARNING
Depress brake pedal while racing the engine to prevent forward surge of vehicle.