Question 110Motor Plants - QMED

The correct answer is A) misfiring. In a diesel engine, a leaking exhaust valve can cause misfiring. When an exhaust valve is leaking, it allows some of the exhaust gases to escape back into the cylinder instead of being fully expelled. This disrupts the proper combustion cycle, leading to misfiring of the affected cylinder. The other options are incorrect: B) Pre-ignition is caused by hot spots in the cylinder, not a leaking exhaust valve. C) and D) Interrupted or reduced scavenging refers to the process of expelling exhaust gases and filling the cylinder with fresh air/fuel mixture, which is not directly related to a leaking exhaust valve.