What's the matter with the old 05 Nissan Bluebird running in front?

The engine has serious carbon deposition, ignition system problems and unstable oil pressure.

1. Serious carbon deposit in the engine: When the throttle valve is too dirty or the fuel injector has too much carbon deposit in the engine, the gasoline sprayed by the fuel injector will be absorbed by the carbon deposit during cold start, resulting in too lean mixture during cold start and difficult start. In this case, it is not easy to enter the car until the gasoline adsorbed by carbon deposits is saturated. After entering the car, the gasoline adsorbed on carbon deposits will be sucked into the cylinder by the vacuum suction of the engine for combustion, and the mixture will become rich.

2. Ignition system problems: Check the working conditions of spark plugs, high-voltage lines and ignition coils. The ignition system is not easy to use, and the spark plug is not in good condition, which will also lead to this failure.

3. Unstable oil pressure: After cleaning the engine carbon deposit, cleaning the throttle and replacing the oil pad and spark plug, the car body is still shaking at idle speed. Check whether the oil supply pressure and intake pressure sensors are normal. If the oil supply pressure of the oil pump is abnormal, or the value of the intake pressure sensor is wrong, the car body will shake.