What to Do About High Fuel Consumption After Cleaning the Throttle Body?

[McVincent]

After cleaning, the fuel injector's spray diameter increases, leading to more fuel being injected per unit time, which results in higher fuel consumption. Due to the lack of proper calibration after cleaning the throttle body, the ECU's detection program continues to calculate and adjust the fuel injection quantity based on the original throttle body settings.

[DeJoy]

As an experienced driver, I know it's quite common to see increased fuel consumption after cleaning the throttle body. This usually happens because the ECU (Engine Control Unit) hasn't been properly adjusted. After throttle body cleaning, the air flow changes, but the ECU still injects fuel based on old data, leading to higher fuel consumption. My suggestion is to first try driving about 100 kilometers to let the system automatically adapt to the new parameters - often this can restore normal operation. If that doesn't work, check whether the throttle position sensor got contaminated or slightly damaged during cleaning - that component is very sensitive. Don't underestimate it, as sensor misreading can cause inaccurate fuel injection and waste gas. Last time I just spent some money at the dealership to reset the ECU, and the problem was immediately solved. Remember, high fuel consumption doesn't just cost money - unstable idling also affects driving safety. Don't delay when issues arise, early intervention is most cost-effective. Regular throttle body inspections during maintenance can prevent problems before they occur.

[KateLee]

High fuel consumption after cleaning the throttle body is usually related to the engine management system. The ECU needs to relearn the throttle opening and closing positions; otherwise, the fuel injection quantity may deviate. The solution is quite straightforward: you can try performing an idle learning procedure yourself—turn the key to the ON position without starting the engine, wait for 30 seconds to let the ECU complete its self-check, then start the car and let it idle for 5 minutes. This step helps the system recalibrate its parameters. If fuel consumption remains high, it’s necessary to check the throttle position sensor; residue from the cleaner or improper installation may interfere with the signal. Using an OBD scanner to read the fault codes is the easiest way to quickly identify the issue. If that doesn’t work, consult a professional technician—they can accurately reset the ECU and test the sensors to ensure everything is restored to normal. It’s recommended to regularly use genuine cleaner to reduce residue and prevent similar issues. Safe driving is crucial, so address any problems promptly to avoid potential hazards.

[Lena]

I just cleaned the throttle body myself and the fuel consumption skyrocketed. As a new driver, I'm really anxious. After some research, I found out the ECU wasn't reset, so the computer was still using old settings to control fuel injection. Try this simple method: After parking and turning off the engine, disconnect the negative terminal of the battery for about 10 minutes, then reconnect it. Start the car and let it idle for a few minutes to allow it to relearn. Take it for a short drive to test—it often works. If fuel consumption remains high, avoid tampering with sensors to prevent further issues. Instead, just visit a nearby small repair shop for a check and reset—it won't cost much. High fuel consumption wastes money and can be dangerous, so addressing it promptly is more reassuring. Remember to handle the throttle body gently during cleaning to avoid accidental damage.