A1 Engine Repair Quiz

1. A vehicle has heavy white smoke emitting from its tailpipe at all engine speeds. The cause of this condition is:
2. A vacuum gauge is connected to a port on the intake manifold of an engine with poor performance. The needle on the gauge fluctuates between 15 "hg and 20 "hg vacuum at idle. This vacuum gauge reading indicates:
3. Technician A says an engine's main bearing insert has a hole that must align with the matching bores oil supply hole. Technician B says that crankshaft bore alignment can be checked with a feeler gauge and a straightedge. Who is correct?
4. A technician is performing a cylinder power balance test on an engine with sequential fuel injection. Two adjacent cylinders are under performing. Technician A says this could be caused by a faulty head gasket. Technician B says this could be caused by leaking secondary insulation. Who is correct?
5. Two technicians are discussing hydraulic lifter preload. Technician A says excessive preload will result in high manifold vacuum. Technician B says insufficient preload will cause excessive valve train noise. Who is correct?
6. Technician A says the valves in many interference engines open further into the combustion chamber that than those of a non-interference engine. Technician B says a broken timing belt in an interference engine can result in damage to the engine's valve train. Who is correct?
7. The spark plug is removed and shop air is introduced to the #1 cylinder while at TDC. Bubbles are seen in the radiator neck. The MOST likely cause of this condition is:
8. The torque converter of an automatic transmission is not engaging. This is resulting in poor fuel mileage. Technician A says the ECT sensor's signal will affect TCC application. Technician B says the ECT sensor will affect the engine's air fuel ratio. Who is correct?
9. Technician A says a flex fan will increase its pitch at higher engine speeds. Technician B says a viscous fan clutch contains a silicon based fluid and should be checked for leaks. Who is correct?
10. A vehicle has a clogged catalytic converter. The LEAST likely cause of this is:
11. After diagnosing and replacing the cooling system's water pump, the vehicle's engine continues to overheat. Which of these is the MOST likely cause.
12. Two technicians are discussing engine sealants and form in place gaskets. Technician A says sealants such as RTV are aerobic. Technician B says some sensors may be damaged if an unapproved sealant is used. Who is correct?
13. An engine has a noise that goes away as the engine warms and reaches operating temperature. Which of these is MOST likely the cause of this condition.
14. An engine suffers from detonation. Technician A this may be caused by a defective EGR valve. Technician B says advanced ignition timing can cause this condition. Who is correct?
15. Technician A says faulty turbocharger bearings will result in a loss of engine oil. Technician B says a dirty turbocharger air filter will result in a loss of engine oil. Who is correct?
16. A squeal is heard in the front of a supercharged V6 engine. This squeal gets louder as the engine is accelerated. Which of these is causing this condition?
17. A vehicle's engine is sluggish and slow to crank. Technician A says to check the starter and its circuit first. Technician B says to check the voltage, capacity, and condition of the battery. Who is correct?
18. A vehicle vibrates only when placed in reverse. The MOST likely cause of this condition is:
19. Two technicians are discussing cylinder bore measurements. Technician A says the cylinder's bore should be measured for out of round. Technician B says the cylinder's bore should be measured and checked for taper. Who is correct?
20. Technician A says that connecting rods and caps are matched and can not be mixed. Technician B says it may be necessary to mark these parts for reassembly. Who is correct?
Please select an answer