What is the cause of the explosion of Geely Yuanjing intake branch pipe?

1, wrong ignition time or early ignition, resulting in tempering or timing problems.

2. The explosion of Geely Yuanjing intake branch pipe is a common problem with many cases. After driving a certain mileage, the intake manifold will explode, and the specific reason should be related to the engine design and ignition mode.

3. If the fuel injector leaks or the fuel vapor purification pipeline provides fuel to the intake manifold, when the timing chain is worn, the exhaust valve will close ahead of time under the action of the valve spring, resulting in partial exhaust backflow. It happens that the engine adopts group ignition mode. Group ignition, every two cylinders use a group of ignition devices, one cylinder ignites during the power stroke, and the other cylinder ignites before the top dead center of the exhaust stroke. Finally, under the action of exhaust reflux and exhaust stroke spark, the excess fuel in the intake manifold is ignited. Fuel combustion makes the gas in the intake manifold expand rapidly, thus breaking through the intake manifold.

4. Temporary solution: overhaul the fuel system and update the timing mechanism. Replace damaged parts, such as intake manifold.

5. The final solution: readjust the valve timing (change the overlap angle) and change the ignition scheme, and change the group ignition to sequential ignition.