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What Causes Intermittent Idle Vibration in CNG Vehicles?

1 Answers

WilliamFitz

07/29/25 10:39pm

Fuel injector malfunction: Uneven fuel injection quantity or poor atomization from the fuel injectors can cause power imbalance among cylinders. Below are relevant details about engine idle operation: 1. Description: The oil pressure gauge reading during engine idle represents the idle working pressure of the fuel supply system, typically 0.25MPa or as specified by the vehicle model's technical requirements. When testing idle working pressure, removing the vacuum tube from the fuel pressure regulator should increase the oil pressure to 0.3MPa; otherwise, the pressure regulator should be replaced. 2. Precautions: During engine operation, regularly monitor the values on the oil pressure gauge and coolant temperature gauge. If the oil pressure or coolant temperature readings significantly deviate from normal levels, immediately stop the engine for inspection or contact an automotive service center.

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What are the reasons why the car air conditioner cannot be turned off?

The reasons why the car air conditioner cannot be turned off are: 1. The air conditioner's switch button is damaged; 2. The air conditioner's thermostat is damaged; 3. The switch contacts are stuck; 4. There is a fault in the switch circuit; 5. Poor contact in the switch. The functions of the car air conditioner are: 1. Adjusting the interior temperature; 2. Humidity regulation; 3. Airflow regulation; 4. Air purification. The working principle of the car air conditioner is that the compressor sucks in the low-temperature and low-pressure refrigerant gas at the outlet of the evaporator, compresses it into high-temperature and high-pressure gas and discharges it from the compressor. The high-temperature and high-pressure superheated refrigerant gas enters the condenser, where it condenses into a liquid due to the reduction in pressure and temperature, releasing a large amount of heat.

What does TC mean on the car dashboard?

TC on the car dashboard stands for the vehicle's Traction Control System. When the system is active, the TC light on the dashboard will illuminate. Most vehicle models are equipped with this traction control system. When the system detects wheel slippage, it applies braking to the slipping wheel, reduces throttle opening, downshifts, etc. Common causes for TC light illumination include: 1. Solenoid valve malfunction. 2. Dirty engine oil clogging the solenoid valve filter. 3. Wear in actuator gears or impellers causing oil pressure leaks that trigger warnings. 4. Throttle body contamination reaching 20% opening, causing the engine control unit to falsely detect TC faults. It's recommended to check if the throttle body needs cleaning or if the issue stems from intake/exhaust camshaft solenoid valves.

How to Set Up Tire Pressure Monitoring Alarm?

The method to set up the tire pressure monitoring alarm is: 1. Press and hold the menu button for 3 seconds, and after a beep, enter the setup function state; 2. Press and hold the adj button for 3 seconds, and the low-pressure alarm value will cycle between 1.8 and 3.2. When it flashes to the desired value, release the button; 3. Press and hold the menu button for 3 seconds, and after hearing two beeps, save and exit. The working principle of tire pressure monitoring is: A built-in sensor is installed on the tire hub, which includes a bridge-type electronic pressure sensing device that detects air pressure, converts the pressure signal into an electrical signal, and transmits the signal via a wireless transmitter.

Do new cars still require a break-in period nowadays?

New cars still require a break-in period, which typically lasts for 3 months or approximately 3,000 to 5,000 kilometers. Precautions to take during the break-in period of a new car include: 1. Warm up before starting: Turn the key to the second position and wait for 5 to 10 seconds before starting the engine to protect the new car's engine; 2. Avoid emergency braking: Emergency braking can shock the braking system during the break-in period, increasing the impact load on the chassis and engine; 3. Avoid overloading: Running a new car at full capacity during the break-in period can damage mechanical components; 4. Avoid long-distance trips: Taking long-distance trips during the break-in period increases the continuous working time of the engine, which can easily lead to mechanical wear.

Can a Spare Tire Be Used After Long Storage?

Spare tires cannot be used after prolonged storage. Tires are rubber products and will age over time, posing safety risks during use. Precautions for using spare tires include: 1. Regularly inspect the spare tire; 2. Avoid prolonged use; 3. Spare tires should not be involved in tire rotation; 4. Keep away from oil products. The method for replacing a spare tire is: 1. Retrieve the spare tire, jack, and tire wrench from the trunk; 2. Place the jack on the chassis support, slowly lift the vehicle, and place the tire pad under the car; 3. Use the wrench to remove the bolts of the tire to be replaced and take off the tire; 4. Align the spare tire with the axle and bolt holes, then tighten the tire bolts.

Is it a problem if the felt under the car chassis is scratched?

It is not a problem if the felt under the car chassis is scratched. Here is an introduction about the car chassis: 1. Introduction: The chassis refers to the combination of the transmission system, running system, steering system, and braking system on a car. 2. Function: It supports and installs the car engine and its various components and assemblies, forming the overall shape of the car, bearing the engine power, and ensuring normal driving. 3. Running system: The function of the leaf spring is to maintain an elastic connection between the frame and the body with the wheels or axle. The function of the shock absorber is to cushion the vibration when the car is subjected to shock. The shock absorber is used in parallel with the leaf spring.

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