What are the symptoms of a leaking turbocharged exhaust manifold gasket?
2 Answers
Symptoms of exhaust manifold leakage are as follows: 1. Abnormal pressure detection: When the intake pipe leaks, the pressure inside the intake pipe changes because it does not follow the normal intake path, resulting in abnormal pressure detection, often manifesting as excessively lean air-fuel mixture and excessive intake air volume. 2. Affects intake air volume: Since the fuel injection quantity is mainly determined by the intake air volume, the greater the gasoline quantity, the more fuel is injected, leading to higher idle speed. Alternatively, due to irregular intake at the leakage point, fluctuating phenomena may occur. Another scenario is when the computer receives idle status through the throttle position sensor. 3. Affects idle speed: If the idle speed is not within the specified range, the computer automatically adjusts the operation of the idle motor, which can also result in fluctuating phenomena. If the leakage is not severe, it may only cause a slightly higher idle speed.
I remember driving my turbocharged car on the highway when suddenly the acceleration felt sluggish, with no power when I stepped on the gas pedal, as if dragging a heavy stone uphill. The car also made a hissing sound like air leaking, especially noticeable under the engine after parking, like a small air pump venting. Upon inspection, I found a hole in the exhaust manifold gasket, causing air leakage and insufficient turbo pressure. Fuel consumption jumped from 8 liters per 100 km to over 10 liters, shrinking my wallet. The worst part was the unstable idle, with the steering wheel shaking violently. Later, I reminded my fellow car enthusiasts: regularly maintain the exhaust system to avoid neglecting such small issues. Before long trips, it's best to warm up the car and listen for unusual noises. Prolonged air leakage can damage the turbo, and replacing it could cost thousands.
