What is the idle speed reset method for a 2005 Accord?
3 Answers
Turn the idle adjustment bolt tight, then loosen it by 1.5-2.0 turns. Slowly loosen the throttle bolt to reduce the engine speed to a very low level, almost stalling. Ensure the engine speed reaches the required range (800-1000 RPM). Press the accelerator and release it to check if the engine stalls. If it doesn't stall, it means the idle speed has been properly adjusted.
Resetting the idle speed on my 2005 Accord is actually quite straightforward. First, turn off the engine and wait a few minutes for it to cool down to avoid the dangers of working on a hot engine. Open the hood, locate the battery, and use a wrench to loosen and disconnect the black negative cable. Leave it disconnected for 10 to 15 minutes to allow the car's computer to reset and clear old data. Then, reconnect the negative cable, start the engine without pressing the accelerator or turning on the AC or lights, and let the car idle for 15 to 20 minutes. The ECU will automatically learn the new idle speed settings. This step is especially necessary after cleaning the throttle body, as the cleaning changes its position and the computer needs to adapt. Wear insulated gloves during the entire process to prevent short circuits. From my experience working on multiple older cars, I've found that the Accord's computer is quite sensitive, and disconnecting the battery can resolve minor idling issues. If this doesn’t work, the problem might be with the idle air control valve or oxygen sensor, and it’s advisable to have it checked at a shop.
I've been driving a 2005 Accord for over a decade and have tried the idle reset method several times - it's simple and effective. Turn off the engine and let it cool, then disconnect the black negative battery terminal by loosening it with a wrench. Wait about 10 minutes for the ECU to forget its settings. Reconnect it, start the engine, and let it idle for 15 minutes without operating any electrical devices - this allows the ECU to automatically readjust. This procedure is mandatory after cleaning the throttle body since the ECU needs to relearn the new position. Be cautious to avoid electric shocks or short circuits during operation, and make it a habit to regularly inspect your vehicle's condition. I often perform these maintenance tasks in my garage - it saves money and hassle. If this doesn't work, check the air filter or fuel system, as these minor issues in older cars can often develop into major problems.
