ASE Certification Practice Tests

56.

Answer A is correct. An internal restriction in the radiator alters the flow of coolant, causing the engine to overheat. Inspect the radiator for external damage and use an infrared thermometer to find internal restrictions.

Answer B is wrong. A stuck closed fan relay results in continuous radiator fan motor operation.

Answer C is wrong. A problem with the radiator cap would also affect the engine's operating temperature at idle.

Answer D is wrong. A leak in the cooling system results in engine overheating at all speeds.

57.

Answer A is wrong. A burned or bent exhaust valve results in a misfire and a tapping sound at the top of the engine in the cylinder head.

Answer B is wrong. A worn camshaft bearing on an (OHC) overhead camshaft engine would result in noise at the top off the engine.

Answer C is wrong. A broken valve spring would also result in noise at the top of the engine.

Answer D is correct. Excessive bearing wear results in a knocking or rapping sound. The technician in the question is hearing the front-most bearing making this knock. It has worn past specifications, and the gap has increased. This wear left the bearing, and the journal unprotected.

58.

Answer A is wrong. A clogged catalytic converter causes a restriction that results in a noticeable drop in power during acceleration.

Answer B is wrong. A clogged or faulty fuel injector would likely cause a vibration in other speeds and gears as well.

Answer C is wrong. A faulty CV-Joint makes a clicking or popping noise while slowly turning corners. The outer CV-joint is typically at fault; it is working at a greater angle.

Answer D is correct. A worn or broken engine mount would result in a vibration that is more noticeable with the brake applied and the transmission placed into gear.

59.

Answer A is wrong. The turbocharger wastegate controls the turbocharger's output. It opens to divert exhaust away from the turbine wheel, depriving it of its source of energy.

Answer B is wrong. A vacuum leak in the intake manifold results in a lean air-fuel ratio.

Answer C is correct. The boost sensor is indicating an overboost condition. A stuck closed wastegate, faulty control valve solenoid, or line all result in an overboost condition. Without this necessary reduction in output, excessive manifold and cylinder pressures could damage vital engine components.

Answer D is wrong. The compressor wheel compresses the air-fuel charge; it's denser in comparison to a normally aspirated engine.

60.

Answer A is wrong. With a standard bolt, a technician could torque the bolt to its yield point, and it would return to its original form and length when removed. It has elasticity; it can stretch and then return to its original form.

Answer B is wrong. Cleaning a bolt that has stretched does not restore it to its original length.

Answer C is wrong. This answer could be correct if the TTY bolt passes all of the manufacturer's required specifications. Be careful when clamping cylinder heads with these bolts.

Answer D is correct. Neither technician is correct. Due to the nature of their design, torque to yield bolts or stretch bolts should not always be reused.