A1 ASE Test Exam With Complete Answers.

If an engine experiences a sharp, metallic rapping noise only when it is idling, the trouble could be worn: `Main bearings `Piston pins `connecting rod bearings `piston skirts - correct answer Piston pins On a port fuel-injected engine, the cause of excessive black smoke in the exhaust could be: `low fuel pressure `an intake manifold vacuum leak `high oxygen sensor voltage `high fuel pressure - correct answer High fuel pressure During a cylinder power balance test on a four-cylinder port fuel-injected engine, one cylinder has a 75-rpm drop and the other cylinders have a 125-rpm drop. Technician A says that the cylinder with a 75-rpm drop may have a burned exhaust valve. Technician B says that the cylinder with the 75-rpm drop may have a bad fuel injector. Who is correct? A only B only Both A and B Neither A nor B - correct answer Both A and B While discussing cylinder head service, Technician A says that torque-to-yield bolts may be reused if they are not damaged. Technician B says that torque-to-yield bolts are usually tightened to a specific torque and then rotated a certain number of degrees. Who is correct? A only B only Both A and B Neither A nor B - correct answer B only The cause of excessive valve stem height could be: `An improperly installed valve guide `excessive material machined from the head surface `a worn valve guide and stem `excessive material removed from the valve seat - correct answer excessive material removed from the valve seat While diagnosing an engines timing belt condition, Technician A says that some vehicle manufacturers recommend checking timing belt wear by measuring the installed length of the belt tensioner. Technician B says that on some engines the valves will strike the top of the pistons if the timing belt jump breaks. Who is correct? A only B only Both A and B Neither A nor B - correct answer Both A and B While discussing engine sealants, Technician A says that RTV sealer dries in the absence of air. Technician B says that anaerobic sealer dries in the absence of air. Who is correct? A only B only Both A and B Neither A nor B - correct answer B only While measuring cylinder taper and out-of-round, Technician A says that the cylinder diameter should be measured at two vertical locations. Technician B says that cylinder our-of-round is the difference between the cylinder diameter in the thrust and axial directions. Who is correct? A only B only Both A and B Neither A nor B - correct answer B only Technician A says that when checking connecting rods, they should be measured to determine if they are bent. Technician B says that each connecting rod should be measured for a twisted condition. Who is correct? A only B only Both A and B Neither A nor B - correct answer Both A and B A cooling system is pressurized to 15 psi with a pressure tester. After five minutes, the pressure reading on the tester is 3 psi, and there are no external leaks. Technician A says that the automatic transmission cooler may be leaking. Technician B says that the heat gasket may be leaking. Who is correct? A only B only Both A and B Neither A nor B - correct answer Both A and B An engine no-start condition is being diagnosed. A 12-volt test light connected from the coil's negative primary terminal to ground flashes while cranking the engine. The most likely cause for the no-start condition is a faulty: `pickup coil `ignition module `ignition coil `ignition switch - correct answer ignition coil Tech A says that an intake manifold vacuum leak may cause cylinder misfiring at idle speed. Tech B says that an intake manifold vacuum leak may cause cylinder misfiring at 2,500 rpm. Who is correct?