CARBURETOR - Idle Speed and Mixture Ratio (Models with catalyzer without E.G.R.)
EF & EC-156flowchartIgnition timing 10°±2° B.T.D.C. in "N" position.
Idle Speed and Mixture Ratio (Models with catalyzer without E.G.R.)
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
(3) Throttle valve switch operating 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 • E.G.R. control valve operation • Throttle valve
- 2Turn off headlamps, heater blower and rear defogger.
- 3Keep front wheels pointed straight ahead.
- 4Make the check after the radiator fan has stopped.
WARNING
Depress brake pedal while racing the engine to prevent forward surge of vehicle.
Idle Speed and Mixture Ratio (Models with catalyzer without E.G.R.)
1
START
2
Start engine and warm it up until water temperature indicator points to the middle of the gauge. Ensure that engine speed is below 1,000 rpm.
3
Open engine hood.
4
Run engine at about 2,000 rpm for 2 minutes.
5
Race engine (2,000 to 3,000 rpm) 2 or 3 times under no-load and run engine at idle speed.
6
Check ignition timing. IGNITION TIMING: 10°±2° B.T.D.C. (in "N" position)
N.G.
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O.K.
7
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