How long will the fuel consumption rise and return to normal after maintenance?

After maintenance, the fuel consumption will return to normal in a week or so.

The main reasons for the increase in fuel consumption after maintenance are:

1, excessive fuel injection: because of too much oil, the stirring resistance of crankshaft in engine cylinder becomes larger, so the fuel consumption increases a little.

2. Wrong oil label: It may be that the oil label does not match the viscosity, which leads to an increase in the kinematic viscosity of the engine.

3. Spark plug failure: The spark plug may be disassembled or damaged, resulting in increased fuel consumption.

4. Throttle mismatch: Some car owners did not let the maintenance master re-match the throttle opening after cleaning the throttle, resulting in excessive throttle opening and increased fuel consumption.

In addition, the newness of the entrance will also affect the fuel consumption of the car: after the wardrobe is used in general cars, especially after 5~ 10 years, the fuel consumption of the entrance will gradually increase.

Constant-speed fuel consumption is the fuel consumption of 100 kilometers in the constant-speed fuel consumption test of some models stipulated by national standards. These types of vehicles include:

(1) M 1, M2 and N 1 compressed natural gas vehicles with the maximum designed gross mass not exceeding 3.5t; For M 1 and N 1 vehicles with the maximum designed gross mass not exceeding 3.5t, the test methods specified in GB/T 12545. 1-2008 "Test Methods for Fuel Consumption of Passenger Cars" shall be followed.

(2) M2, M3, N2 and N3 compressed natural gas vehicles with the maximum design gross mass exceeding 3.5t; Vehicles of M2, M3 and N with the maximum gross mass greater than or equal to 2t shall be tested according to the test method specified in GB/T 12545.2-200 1 Test Method for Fuel Consumption of Commercial Vehicles.

Class m and class n motor vehicles are defined in GB/T 15089-200 1.