I bought a new Beijing Hyundai Accenture car in June 5438+February last year, but something happened and it was replaced with a new shell. After the repair, there was a lot of noise inside the car. Wh

I bought a new Beijing Hyundai Accenture car in June 5438+February last year, but something happened and it was replaced with a new shell. After the repair, there was a lot of noise inside the car. What is the reason? The following points are for the landlord's reference: 1. Diagnostic method of idle switch not turned off: turn on the air conditioner and turn the steering wheel at idle speed. If the engine idle speed does not increase, it is proved that the idle speed switch is not closed. Troubleshooting: Adjust or replace the throttle position sensor. 2. There is a fault diagnosis method for idle control valve: check the action sound of idle control valve. If there is no action sound, the idle speed control valve is faulty. Troubleshooting: Clean or replace the idle speed control valve, and basically set the idle speed with a special decoder. 3. Diagnosis method of air leakage in the air intake pipe: If you hear the squeak of air leakage in the air intake pipe, it proves that the air intake system is leaking. Troubleshooting: Find leaks, reseal or replace related parts. 4. Diagnostic method for dripping or clogging of the fuel injector: use a stethoscope to check whether the fuel injector makes a "squeak" sound or measure the fuel injection quantity of the fuel injector. If there is no sound from the injector or the injection quantity exceeds the standard, the injector is faulty. Troubleshooting: Clean and check the fuel injection quantity of each injector to ensure that there is no blockage or leakage. 5. Diagnostic method of EGR valve opening under idle condition: Remove EGR valve. The exhaust gas recirculation channel is blocked and the fault disappears, which is a fault. Troubleshooting: This fault is mostly caused by the EGR valve being stuck in the normally open position due to carbon deposition. The fault can be eliminated by removing carbon deposit on EGR valve or replacing EGR valve.