After maintaining the car, the fuel consumption has increased?
It stands to reason that the performance of the vehicle will be improved after maintenance, especially after replacing the spark plug, the engine will burn better and the fuel consumption should be reduced. Now the fuel consumption is rising instead of falling. What is the reason?
Don't panic, measure the fuel consumption several times first.
Don't panic, if there is an increase in fuel consumption after maintenance, first of all, Lungu suggested that friends test it several times more. Road conditions, self-weight, driving habits and other factors may lead to an increase in fuel consumption.
What are the possible reasons for the increase in fuel consumption after maintenance?
After eliminating the above factors, you may wish to re-understand what maintenance projects you have done. Fuel consumption may increase after the following maintenance:
1, too much oil or wrong model.
If the used engine oil is different from before, the old engine oil is not clean, and the engine oil is added too much, which will lead to the different viscosity of the engine oil and increase the engine running load. In order to get more power, fuel consumption will inevitably increase.
Not only that, too much oil will not only increase fuel consumption, but also make the engine "fleshy". Adding too much will increase the burden of scraping piston ring oil downward, the engine oil that cannot be scraped cleanly will burn carbon deposits in the combustion chamber, and the discharged engine oil exhaust gas will pollute the three-way catalytic converter, and even the exhaust gas will emit blue smoke.
The correct way is to add the oil to the correct oil level and keep the oil level at the center line of the dipstick.
In addition, don't think that the higher the viscosity of the engine oil, the better the lubrication of the engine. Too high viscosity will also lead to greater running resistance of the engine, so before changing the oil, be sure to confirm the recommended oil model in the user manual.
2, the spark plug model is wrong or the installation is not tight.
Spark plugs are screwed according to torque, but many maintenance masters basically rely on hand feeling, that is, almost. Moreover, the maintenance personnel are not skilled in mastering the strength, and often use too much force to unscrew the ceramic part above the spark plug.
The spark plug should be tightened according to the standard torque specified by the manufacturer, otherwise it will leak, and the high-temperature and high-pressure gas will slowly leak out, resulting in engine weakness, unstable idle speed, easy flameout at high speed, increased fuel consumption, and even failure to start the engine, which will seriously lead to the failure of the spark plug and serious consequences of engine damage.
3. After cleaning the throttle, there is no re-matching.
Because the throttle opening will become larger after cleaning, the engine computer will control the air intake and fuel injection according to the opening parameters before cleaning, so the fuel consumption will increase.
If you have done a throttle cleaning project during maintenance, it is likely that the throttle did not match successfully after cleaning. If you go back and match it again, the fuel consumption will be normal.
It is generally recommended to clean the throttle for 20,000-40,000 yuan, and you must use a computer to study after cleaning.
4. Clean up the three-dimensional blockage caused by carbon deposition.
If the carbon deposit is removed, it will run normally in some cases, because the driving computer needs a certain mileage to adapt to the working conditions after cleaning.
However, if the carbon deposits are cleaned up, the three-way blockage caused by the cleaned carbon deposits will also lead to an increase in fuel consumption.
5. The average fuel consumption is reset during maintenance.
During maintenance, the average fuel consumption is reset, so the fuel consumption is recalculated. If you don't get on the highway right away, the recalculated fuel consumption will be very high in the early stage, and it will come down after running for hundreds of kilometers.
6. Replace the brake pads.
After replacing the new brake pads, the friction gap is relatively small, and the resistance formed during braking is relatively large, which will cause a slight increase in fuel consumption, and the brake pads will be fine after the running-in period, generally about 300 kilometers.
But this will only lead to a slight increase in fuel consumption, rather than a substantial increase in fuel consumption.
Summary:
Maintenance and testing are not standardized during maintenance, and it is indeed possible that the above situations will lead to an increase in fuel consumption after completion.
I suggest that when maintaining your car, you must go to a more professional repair shop. Don't increase car consumption just to save a few dollars. It's all glistening money