Buick Regal 2.4 displacement cannot be started after valve change.

The first reason is battery damage. The second reason is that the fuel-air mixture ratio of vehicles is abnormal, which is also the most common and typical reason. In this case, the engine is normally ignited, but it cannot be started. This phenomenon usually occurs because the throttle valve, intake valve or idle motor are too dirty. The following is a detailed introduction about Buick Regal's startup failure:

1. If the valve is too dirty, gasoline will be sprayed on the back of the valve and absorbed by the carbon deposit, so the car cannot be started. General cleaning can solve the problem.

2. The power supply voltage of the ignition system is unstable. In winter, the pressure of automobile engine is high, including insufficient battery power, which leads to insufficient voltage of the whole ignition system.

3. The battery is dead, the spark plug won't ignite, and the fault of the starting circuit is also one of the reasons why the car can't start.