Basic Engine Diagnostics

What is the first step when trying to diagnose a problem with a vehicle?

• Check the oil.

• Test drive the vehicle.

• Ask the customer questions.

• Check the tire pressure.

Blue smoke is a sign of burning oil.

• True

• False

Excessive blowby is?

• Pressure in the crankcase.

• Seen when removing the fill cap.

• Enough to push the dipstick out.

• All of the above.

Black smoke is caused by excessive/unburned fuel. It can also be caused by not enough _______?

• Coolant

• Oil

• Intake air

• Speed

When performing a cylinder leakage test, air can be heard coming out of the air filter. This is a sign of an?

• Head gasket problem.

• Intake valve problem.

• Exhaust valve problem.

• Piston problem.

"Milky" oil is a sign of______ in the oil.

• Fuel

• Brake fluid

• Coolant

• Dirt

If you have coolant in the oil it is always a bad head gasket.

• True

• False

If every exhaust valve is bent but the intake valves are ok. Its a good chance that the engine experienced an overspeed condition.

• True

• False

A cylinder compression test can be performed by connecting a pressure gauge to the spark plug hole and cranking the engine.

• True

• False

If you don't have a stethoscope to find a noise in the engine, a long screwdriver can be used.

• True

• False