Idle Speed/Ignition Timing/Idle Mixture Ratio Inspection
EF & EC-400flowchartMixture ratio adjustment with CO-meter (air flow meter variable resistor method).
Checking and adjusting mixture ratio [With "CO"-meter]
1
INSPECTION START
2
Check and adjust idle speed and ignition timing. (Refer to EF & EC-397.)
Idle speed: 850±50 rpm
Ignition timing: 15°±2° B.T.D.C.
3
Race engine (2,000 - 3,000 rpm) 2 or 3 times under no-load, then run engine at idle speed.
4
Check "CO" with "CO"-meter.
Idle "CO" %
Below 2.0
O.K.
return to step 12
N.G.
5
Turn off engine and remove air flow meter from vehicle.
6
Drill a hole in seal plug which seals variable resistor of air flow meter and remove seal plug.
7
Install air flow meter on vehicle. Start engine and warm it up until water temperature indicator reads normal operating temperature.
8
Race engine (2,000 - 3,000 rpm) 2 or 3 times under no-load, then run engine at idle speed.
9
Adjust "CO"% by turning variable resistor on air flow meter.
Idle "CO" %
0.5±0.5
10
Turn off engine and remove air flow meter from vehicle.
11
Insert new seal plug into variable resistor hole. Tap seal plug with a suitable bar, thereby installing seal plug on air flow meter.
12
A (continues on next page)