Question 106Motor Plants - QMED

The correct answer is C) low starting air pressure. When a diesel engine is started using compressed air, low starting air pressure can cause the engine to turn over slowly without firing. This is because the starting air is responsible for cranking the engine and providing the initial compression needed for the fuel to ignite. If the starting air pressure is too low, it may not be able to generate enough force to effectively turn over the engine and start the combustion process. The other options are incorrect because they are not directly related to the issue of starting air pressure. An obstruction in a cylinder (A) or water accumulation (B) would not specifically cause the engine to turn over slowly without firing, and low scavenge air pressure (D) is a different system not directly involved in the starting process.