Final answer:
The restriction in the hose from the positive crankcase ventilation valve to the intake manifold can cause an acceleration stumble, oil accumulation in the air cleaner, engine surging at high speeds, and engine detonation during acceleration.
Step-by-step explanation:
The restriction in the hose from the positive crankcase ventilation valve to the intake manifold can lead to several problems. One of the problems is an acceleration stumble, where the engine may hesitate or stumble during acceleration. This is because the restricted hose affects the flow of air and fuel mixture into the engine, resulting in a disruption of the combustion process.
Another problem that can arise is oil accumulation in the air cleaner. This happens when the positive crankcase ventilation system is not able to properly remove excess oil vapors from the crankcase, causing them to be drawn into the intake manifold and eventually accumulate in the air cleaner.
Additionally, a restricted PCV hose can result in engine surging at high speeds. The restricted flow of air and fuel mixture can cause the engine to surge or fluctuate in RPM, particularly at higher speeds.
Finally, engine detonation during acceleration can occur due to the restricted hose. Detonation is an uncontrolled combustion process that can cause knocking or pinging sounds. The restriction in the PCV hose can disrupt the air-fuel mixture ratio, leading to abnormal combustion and detonation.