Mazda 6 Service Manual: Engine tune-up

IGNITION TIMING INSPECTION

Note

• Ignition timing is not adjustable.

• Ignition timing verification requires WDS or equivalent.

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 ignition timing (WDS: SPARKADV PID) is within the specification using WDS or equivalent.

Ignition timing
Approx. BTDC 10 degree

4. Verify that ingestion timing advances when the engine speed increases gradually.

IDLE SPEED INSPECTION

Note

• Ignition timing is not adjustable.

• Ignition timing verification requires WDS or equivalent.

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 (WDS: RPM PID) is within the specification using WDS or equivalent.

Idle speed (L8 engine model)

Idle speed (LF engine MTX model)

Idle speed (LF engine ATX model)

Idle speed (L3 engine model)

*1 : Excludes temporary idle speed drop just after the electrical loads are turned on.

*2 : Blower motor is operating at high speed. Headlight switch is turned on. Rear window defroster switch is turned on. Cooling fans are operating.

IDLE MIXTURE INSPECTION

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.) (See IGNITION TIMING INSPECTION.)

4. Insert an exhaust gas analyzer to the tailpipe.

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