During a cylinder leakage test, air is observed escaping from the throttle body while the piston is at Top Dead Center (TDC) on the compression stroke. Which of the following is the most likely cause?

What is the relationship between crankshaft and camshaft rotation in a standard four-stroke automotive engine?

When measuring a crankshaft journal for out-of-roundness during an engine rebuild, which tool and technique should be used?

Which of the following conditions is most likely to cause 'pre-ignition' in a high-performance engine?

During a vacuum test, the needle on the gauge vibrates rapidly at idle but stabilizes as engine speed increases. What does this usually indicate?

What is the primary purpose of 'honing' the cylinder walls during an engine rebuild?

A technician finds blue smoke exiting the tailpipe during deceleration (high vacuum) but not during acceleration. What is the most probable cause?

Which of these is the correct procedure for tightening cylinder head bolts?

In a variable valve timing (VVT) system, what medium is most commonly used to change the position of the camshaft phaser?

If an engine's oil is found to have a 'milky brown' appearance similar to a milkshake, which failure is most likely?

Which engine component is responsible for converting the reciprocating motion of the pistons into rotational motion?

When checking for engine block deck flatness, what is the maximum allowable warpage typically permitted in a transverse engine block?

An Interference Engine is best described as an engine where:

During a wet compression test, the compression pressure rises significantly compared to the dry test. What does this indicate?

What is the function of the 'harmonic balancer' (vibration damper) located on the front of the crankshaft?

A technician uses 'Plastigage' during the installation of main bearings. What specifically is being measured?

Which of the following is the most likely result of 'Valve Overlap'?

Hydraulic valve lifters (lash adjusters) use engine oil to:

What is the purpose of 'Stretch Bolts' (Torque-to-Yield) frequently used in modern cylinder heads?

A 'Blow-by' condition in an engine is primarily caused by:

During engine disassembly, why is it important to check for a 'Ridge' at the top of the cylinder bore?

An engine undergoes a 'Crankshaft End Play' check using a dial indicator. If the measurement exceeds the manufacturer's maximum specification, which component is most likely worn or damaged?

A technician is using a feeler gauge to measure the 'Piston Ring End Gap' while the ring is positioned in the cylinder bore. What does this measurement primarily account for?

An engine has a 'constant' light blue smoke coming from the exhaust regardless of engine load or speed. A compression test shows low readings in two adjacent cylinders, which do not improve during a wet test. What is the most likely cause?

An engine has a 'low oil pressure' warning light that illuminates only when the engine is hot and idling, but turns off as soon as the engine speed increases. Assuming the oil level is correct, what is the most likely internal mechanical cause?

A technician is checking the 'Valve Lash' on an engine with a solid lifter valvetrain. If the clearance is found to be significantly tighter than the specification, what is the most likely long-term consequence?

An engine has a 'hunting' or surging idle after it reaches operating temperature. A technician sprays a small amount of carburetor cleaner around the intake manifold mating surface, and the engine RPM stabilizes and increases slightly. What does this indicate?

During a cooling system pressure test, the pressure drops but no external leaks are visible. A spark plug is removed and found to be unusually clean or 'steam cleaned.' What is the diagnosis?

Which engine component is responsible for keeping the valves closed tightly against their seats when the camshaft lobe is not applying pressure?

Which of the following is responsible for opening the valves in a standard Overhead Valve (OHV) engine?

An engine has a 'knock' that is loudest when the engine is cold and disappears as it warms up. What is a common cause?