Question

to inspect an exhaust system, technicians do all of the following except:

a. block off the exhaust pipe with the engine running and listen/feel for leaks.
b. use large, adjustable pliers to test the integrity of the pipes by moderately squeezing the pipes.
c. spray the exhaust system with dye check and use a florescent light to locate leaks.
d. inspect for leaks or rust holes in the exhaust system.

Explanation:

• Option a: Blocking the exhaust pipe with the engine running is dangerous as it can cause back - pressure and damage the engine or lead to carbon monoxide poisoning.
• Option b: Using pliers to test pipe integrity by moderate squeezing is a valid non - destructive testing method for checking pipe strength (to some extent).
• Option c: Using dye and a fluorescent light is a common method for leak detection in various systems.
• Option d: Visual inspection for leaks and rust holes is a basic and valid part of exhaust system inspection.

Answer:

A. Block off the exhaust pipe with the engine running and listen/feel for leaks.