What are the symptoms of a bad intake manifold in a car?

[Shaun]

The symptoms of a bad intake manifold include weakened intake capacity, reduced engine power, insufficient air intake, and increased engine carbon deposits. Function of the intake manifold: For carburetor or throttle body fuel injection engines, the intake manifold refers to the intake passage from the carburetor or throttle body to the cylinder head intake port. Its function is to distribute the air-fuel mixture from the carburetor or throttle body to each cylinder's intake port. Advantages of plastic intake manifolds: Lower cost and lighter weight. Additionally, since the thermal conductivity of PA (polyamide) is lower than that of aluminum, the fuel injector and incoming air temperature are lower. This not only improves hot start performance and increases engine power and torque but also helps avoid heat loss in the pipe during cold starts, speeding up the increase in gas temperature. Moreover, the smooth inner walls of plastic intake manifolds reduce air flow resistance, thereby enhancing engine performance.