Question

Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within an inch of the tailpipe mouth. Technician A says that if the paper is vibrating due to a "puffing" output from the tailpipe, this signals a smoothly running engine. Technician B says that if the paper is being drawn toward the tailpipe, this could indicate burned exhaust valves. Who is correct?

A. Technician B
B. Both Technicians A and B
C. Technician A
D. Neither Technicians A or B

Answer 1

The person that is correct out of the two technicians statements is; A: Technician B

Which Technician is Correct?

For a cylinder power balance test on a four-cylinder port fuel-injected engine, if one cylinder has a 75-rpm drop and the other cylinders have a 125-rpm drop then we can say that the cylinder with a 75-rpm drop may have burned exhaust valve.

Similarly, we can say that the cylinder with a 75-rpm drop may have a bad fuel injector.

Now, either a burned exhaust valve or a defective fuel injector result in partial misfiring of the cylinder and less RPM drop on that cylinder during a cylinder balance test and as such relating this to the statements made by the technicians, we can say that Technician B is correct.

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