How to repair the throttle valve that is often closed in the fifth national diesel vehicle?

1, check the engine air filter and clean or replace the filter element.

2, check the throttle and related accessories, clean up the stagnation and carbon deposition.

3. Measure the engine compression pressure and calibrate the normal throttle opening.

4. Adjust the internal pressure of throttle and intake manifold to meet the standard requirements.

5. Check the engine control system and repair the faulty parts or circuits.

6. Re-adjust the control system to ensure the correct throttle opening control.