How does the fuel consumption increase after the throttle is cleaned?

It's normal! Almost most cars are like this! Because the original throttle is dirty, especially when the throttle opening is not large (when the throttle is lightly stepped on), because the throttle is too dirty, the actual caliber becomes smaller and the air intake is relatively small. In order to match the air-fuel ratio, the computer will also reduce the fuel injection.

And after you wash the throttle, it suddenly becomes clean, and the amount of air flowing through the throttle suddenly increases, so the computer will increase the fuel injection to maintain the air-fuel ratio. The fuel consumption will be great.

It's just that the computer didn't adapt to the throttle that was suddenly cleaned. In fact, after the accelerator was washed, I got on the ring expressway (the ring expressway is generally free and there is no need to pay the toll). After the computer is adapted, the fuel consumption index is restored. —— Or directly remove the negative electrode of the car battery and put it back after 2 minutes, so that the car computer can be completely reset. This will also make the fuel consumption immediately return to normal level.