A1 ASE Test (All Solved)

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 answers 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 answers 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 answers 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 answers 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 answers 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