Drivability Practice Exam

Turbocharger and supercharger systems are meant to push more air into the engine, increasing power. When there’s a problem, the amount of boost the engine actually receives changes, and you feel it in how the car responds. Loss of boost means the engine isn’t getting the extra air it needs, so acceleration drops and you may notice lag or hesitation as the engine struggles to respond with less air than expected. Common culprits are leaks in hoses or the intercooler, which let pressured air escape before it reaches the intake, or a faulty wastegate that doesn’t regulate boost correctly, causing underboost or erratic boost. These issues tie directly to boost pressure, so the drivability symptoms are weaker power, slower response, and rough or uneven acceleration. The other statements don’t fit because turbo problems aren’t limited to idle, they don’t make fuel economy better when worn, and boost pressure clearly does relate to how a turbo or supercharger affects engine performance.