Jetta start up idle speed is high, how to solve it?

There are probably a few things that can cause high idling:

1. Improper cleaning of the throttle valve causes the failure of the stepper motor, and the cleaning should be wiped off with a soft cloth dipped in the cleaning agent, instead of spraying directly into the throttle with a nozzle, so that the cleaning liquid will flow into the stepper motor and cause damage. You can wash it again and try it again. 2. Check the water temperature sensor, if there is a problem with the signal transmitted by the water temperature sensor, the ECU is to judge that the engine is in a low-temperature running state, and mislead the multi-injection to increase the speed.

This is the reason why the idle speed of the cold engine is high, and when the water temperature arrives, the signal from the sensor passes, and the engine slows down.

3. Check the solenoid valve of the carbon canister, which is the black tank on the left side of the engine compartment, the function of the carbon canister is to collect gasoline vapor to prevent pollution of the atmosphere, and the collected gasoline vapor enters the steam intake pipe to the engine combustion, the intake steam is controlled by a solenoid valve, when the solenoid valve is closed when idling, when the speed exceeds 1200 rpm, open the gasoline vapor into the inlet duct, if the solenoid valve fails, when it is in the normally open state, the actual air intake is greater than the ECU standard air intake at idle speed, and the idle speed is naturally high.

4. The fuel injector is worn, and the fuel injection volume is larger than the standard.

5. The problem of the battery, if the battery voltage is lower than 14V during the engine operation, the ECU will also misjudge the idle speed to charge the battery, it is recommended to check the voltage. 6. For some older cars (more than 100,000 kilometers), we should also pay attention to check the engine vacuum tube, if the vacuum tube leaks or is blocked, it will also cause the idle speed to rise, and the symptom is to slowly increase the speed.

Jetta starts with high idle speed, depending on the specific situation such as cold and hot cars! Generally, it is necessary to check the engine intake system, such as the EFI throttle, idle motor, etc., to see whether it is necessary to clean the carbon deposits! Carburetor car cleans carburetor and other air intake systems with carbon deposits!

My Jetta is a new car that has run less than 20,000 kilometers, and now the speed is high, just turn off and restart, and it will be high again after a while.

The car is running normally at a stop on 1200, and the ignition is normal from starting, and the idle speed is high sometimes and sometimes not.

Check the temperature sensors, one is for the water temperature and the other is for the inlet air temperature.

I changed the spark color or the high-voltage wireThis problem is not hit. If it doesn't work, check the oil circuit. For example, clean the fuel injector.

EFI or carburetor? The EFI cleans the throttle, and the carburetor cleans the carburetor.

Hello, there are several reasons why the idle speed of the cold car is unstable when it starts:

1. Caused by excessive dirty throttle;

2. Caused by the failure of the oxygen sensor;

3. The water temperature sensor is faulty;

4. Caused by excessive carbon deposition in the spark plug;

Solution: 1. Clean the throttle;

2. Use a special car computer to detect fault codes;

3. Replace the spark plug;

The reason for the high idle speed is the dirty throttle and poor return. Check whether the accelerator pedal and accelerator cord are stuck, the throttle is too dirty, and the closure is not tight.

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