Exam 48: Diagnosing Engine Performance Problems

A(n) ____________________ is indicated when the needle drops at regular intervals.

Running compression should MOST-Likely be about:

A gummy deposit buildup behind the throttle plate can be caused by poor quality fuel, blowby, and exhaust gas recirculation (EGR) gases.

Which of the following is the LEAST-Likely cause of a compression leak?

A traditional ____________________ test measures how well a cylinder is sealed by the cylinder head gasket, piston rings, and valves.

Sometimes an engine starts and runs but one cylinder has a dead misfire.

Sometimes, a V-type engine can have a vacuum leak between the underside of the intake manifold and the crankcase. Describe one way to test for this.

What three events should occur in order for an engine to start running properly?

Low compression can result from engine breathing problems and ____________________.

A collapsed laminated (two-layer) exhaust pipe will often cause a stripe of discoloration on the outside of the pipe at the point of restriction.

All of the following statements are true EXCEPT:

How would you perform a wet compression test?

While having a discussion, Technician A says that a compression test will tell the condition of oil control rings and compression rings. Technician B says that the compression test will only tell the condition of compression rings. Who is correct?

The spark created by the ignition system must be delivered to the correct spark plug at a specified point after top dead center (TDC).

The item that can MOST-Likely cause an engine to have increased compression, which can cause fuel to detonate in the cylinder is:

All of the following statements are true EXCEPT:

A(n) ____________________ is a popular machine used to locate vacuum, oil, cooling, and exhaust leaks.

How would you test for a restricted exhaust?

The ____ can pinpoint causes of combustion chamber leakage.

While having a discussion, Technician A says that dry black soot at the exhaust pipe indicates an overly rich air-fuel mixture. Technician B says that it indicates oil consumption. Who is correct?