High Idle Speed After Replacing Idle Speed Motor and Solutions
2 Answers
The solutions for high idle speed after replacing the idle speed motor are as follows: Method 1: Air leakage in the intake system caused during cleaning leads to high idle speed. If this occurs again, ask the technician to confirm there is no air leakage in the intake pipe. Another issue could be poor connection of the idle speed motor, which may cause stalling or high idle speed. Method 2: This could be due to unstable idle speed control or excessive carbon deposits affecting the idle speed control system of the electronically controlled engine. Method 3: The ECU controls the engine to maintain optimal working conditions based on input signals from various sensors. When this fault occurs, primarily check if the input signals from each sensor to the ECU are normal, and then inspect the working condition of the actuators.
I just replaced the idle speed control valve, but the idle is still too high – a pretty common issue. After installing new parts, inaccurate idle control could be due to improper alignment during installation, incorrect gap adjustment between the idle valve and throttle body, or an intake air leak. Check that the wiring connectors are securely plugged in without small cracks. Another reason might be the ECU not adapting – the computer still remembers the old valve settings. Try disconnecting the negative battery terminal for 5 minutes and reconnecting it to let the system relearn idle parameters. Cleaning the throttle body can also help remove carbon buildup. If DIY doesn’t work, it’s best to take it to a professional shop for a diagnostic scan to check for trouble codes, which might involve other sensors like the mass airflow sensor or throttle position sensor. Be patient and avoid rushing into further disassembly—safety first. Most cases can be resolved with minor adjustments.
