What are the common issues with the L2B 1.5 engine?

[Rhett]

Common issues with the L2B engine are as follows: 1. Intake manifold noise: When pressing the accelerator pedal hard for rapid acceleration, a continuous sound similar to a gas stove igniting can be heard from the engine compartment, which disappears upon releasing the accelerator. Many have found that this issue is caused by a damaged vacuum check valve in the intake manifold, and replacing the check valve can resolve the problem. 2. Aging: The intake manifold of the L2B engine is constantly exposed to high temperatures, causing the diaphragm of the vacuum valve to age quickly. Once aged, the suction force causes the flap to hit the intake manifold, resulting in noise.