What could potentially happen if the turbocharger waste-gate is stuck closed?

What could potentially happen if the turbocharger waste-gate is stuck closed?

• A. Engine overheating.
• B. Increased exhaust pressure.
• C. Reduced turbo response.
• D. Boost leakage.

Answer: (B)

When the wastegate is stuck closed, all the exhaust gas must go through the turbo’s turbine instead of being diverted away. That creates more resistance in the exhaust path, so the exhaust manifold experiences higher pressure, i.e., increased exhaust pressure. The turbo will be driven harder and boost can rise, but the immediate, most direct consequence described here is the buildup of backpressure in the exhaust system.

When the wastegate is stuck closed, all the exhaust gas must go through the turbo’s turbine instead of being diverted away. That creates more resistance in the exhaust path, so the exhaust manifold experiences higher pressure, i.e., increased exhaust pressure. The turbo will be driven harder and boost can rise, but the immediate, most direct consequence described here is the buildup of backpressure in the exhaust system.