Mazda 6 Service Manual: No.5 engine stalls-after start/at idle

No.4 hard to start/long crank/erratic start/erratic crank

No.6 cranks normally but will not start

Other materials:

Mazda 6 Service Manual: Plastic Part Maintenance
When cleaning the plastic lenses of the lights, do not use gasoline, kerosene, rectified spirit, paint, thinner, highly acidic detergents, or strongly alkaline detergents. Otherwise, these chemical agents can discolor or damage the surfaces resulting in a significant loss in functionalit ...

Mazda 6 Service Manual: Mechanical system test
Mechanical System Test Preparation 1. Engage the parking brake and use wheel chocks at the front and rear of the wheels. 2. Inspect the engine coolant. (See ENGINE COOLANT LEVEL INSPECTION.) 3. Inspect the engine oil. (See ENGINE OIL INSPECTION.) 4. Inspect the ATF levels. (See AUTOMATIC TRANS ...