ASE SMS Questions and Explanations:


The correct answer is A. Excessive piston to cylinder wall wear (worn piston and rings) can make a knocking noise when the engine is cold. As the engine begins to warmup, the piston expands slightly, and the noise will begin to go away. Options B, C and D can create engine noise, but will be a more consistent noise and not change as the engine warms up.



The correct answer is A. If the brake pedal is hard to apply, this normally indicates the power assist system is not working as intended. If the vehicle shudders when braking, this is normally an indication of excessive rotor runout.  If the brake warning light illuminates, this is normally an indication a low brake fluid level, or an issue with the parking brake system. The brake pedal will feel spongy if there is air in the brake fluid.



The correct answer is D. A leaking turbocharger impeller shaft seal will allow oil to be pulled into the engine intake manifold resulting in oil consumption. Options A, B, and C will not cause an oil consumption concern.



The correct answer is C. When the transmission is put in gear, the engine is loaded and the noise stops.  Low engine oil pressure could cause a noise at all times. Noise from worn valve lifters or a broken rocker arm/cam follower would not stop when the engine is loaded. A broken flywheel flexplate could be loose when there is no load on the engine resulting in a noise, but could then bind when the engine is loaded causing the noise to stop.