How to judge that vvt solenoid valve is broken

Pacific Auto Network judges that the vvt solenoid valve is broken: when the car is turned off, open the upper cover of the valve chamber, and then twist the camshaft with a wrench to see if the VVT actuator deviates from a certain angle. If not, it is proved to be good, otherwise it is damaged.

What happened to the vvt valve? When the variable timing valve is ready, it will generally fail to accelerate, report an error code, increase fuel consumption and make it difficult to start. If there is a problem with the vvt system, it will cause a temporary delay, resulting in the vehicle being unable to accelerate or stagnate. Generally speaking, it is difficult to start and the idle speed is unstable.

Speaking of the failure of vvt, it's really a headache. Take the VVT technology of General Motors as an example, which is installed on LDE and 2HO engines. These two engines are used in Yinglang (see the transaction price | vehicle details), Cruze and Jing Cheng respectively. Only Europe and other models. Once there is a problem, our repairman will be drunk to death. Tik Tok's video says that this is a magical car that can only be repaired by burning incense.

Typical faults are P00 1 1P00 1.

4. Position performance of intake and exhaust camshaft, unreasonable position of intake and exhaust camshaft, control circuit of solenoid valve of intake and exhaust position actuator, etc. How should we fix the failure of VVT?

The structure of each model is similar and basically follows several principles.

1 Check the timing, because VVT is based on the basic timing of the engine, and the overlap angle of intake and exhaust valves is changed on the basis of the basic timing, so there will be no problem with the basic timing.

When the basic timing is correct, it is easy for many technicians to ignore the oil circuit of the engine, because the VVT system relies on oil pressure to change the angle of the actuator, and there are problems with oil pressure and oil flow, which also leads to the failure of VVT to work normally.

If all the above are normal, it is necessary to check according to the specific fault code. For example, if there is a fault code in the control circuit of the actuator solenoid valve at the intake camshaft position, it is necessary to check the adjustment instruction of VVT to see whether the instruction is normal, whether the working power supply and grounding wire of the actuator solenoid valve are in place, and whether the bolt is rusted or broken.

4 Don't forget that VVT is based on the signals of intake and exhaust camshaft position sensors and crankshaft position sensors. When the signal of the position sensor is incorrect or disturbed, the VVT system will definitely light the fault light.

The fault of VVT system is mostly the fault of oil-controlled solenoid valve, and the fault of oil-controlled solenoid valve is almost always the stuck slide valve.

Fault range of starting difficulty 1 circuit fault, spark plug and ignition coil fault; The high-voltage line leaks electricity, and the wire connection is loose or disconnected. Oil circuit fault: the fuel pipe is dirty or blocked, and the fuel pump is faulty. 3 Electronic throttle body assembly failure or accelerator pedal position sensor failure, engine coolant temperature sensor failure or MAF sensor failure, engine control module failure, camshaft position control system failure. 4. The cylinder pressure of the mechanical part is low; The upper valve seat pressure leaks, the valve stem is stuck, and the valve spring force is insufficient or damaged; Cylinder gasket leakage, piston ring adhesion or damage, piston, piston ring or cylinder wear; The PCV valve is faulty, and air is sucked from the intake manifold pad or the throttle body pad.

Engine idling instability fault range circuit fault spark plug fault, high voltage line leakage or high voltage line disconnection, igniter ignition coil fault. Fuel pressure out of specification, injector failure, evaporative emission control system failure. Electronic control part fault sensor performance is poor, electronic throttle body assembly fault, sensor fault, electric load component fault, idle air control fault, generator and line fault), system fault mechanical fault, intake manifold, throttle body or cylinder head gasket leakage evaporative emission control system fault, engine overheating, low cylinder pressure, loose or disconnected connection of true /k0/ hose, and valve fault.

(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)