IDLE MIXTURE INSPECTION [LF, L3]

Unleaded Fuel Models

1. Turn off the electrical loads.

2. Warm up the engine as follows.

(1) Start the engine.

(2) Maintain the engine speed at approx. 3,000 rpm until the cooling fans start to operate.

(3) Release the accelerator pedal.

(4) Wait until the cooling fans stop.

3. Verify that the idle speed and ignition timing are within the specification. (See IDLE SPEED INSPECTION [LF, L3].) (See IGNITION TIMING INSPECTION [LF, L3].)

4. Insert an exhaust gas analyzer to the tailpipe.

5. Verify that the CO and HC concentrations are within the regulation.

CO and HC concentration

Within the regulation

Leaded Fuel Models

1. Turn off the electrical loads.

2. Warm up the engine as follows.

(1) Start the engine.

(2) Maintain the engine speed at approx. 3,000 rpm until the cooling fans start to operate.

(3) Release the accelerator pedal.

(4) Wait until the cooling fans stop.

3. Verify that the idle speed and ignition timing are within the specification. (See IDLE SPEED INSPECTION [LF, L3].) (See IGNITION TIMING INSPECTION [LF, L3].)

4. Insert an exhaust gas analyzer to the tailpipe.

5. Verify that the CO and HC concentrations are within the regulation.

• If not within the specifications, turn the adjusting screw to adjust CO and HC concentration using SST.

CO and HC concentration

Within the regulation