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What is the cause and solution for high idle speed after replacing the idle speed motor?

2 Answers

ManuelRose

07/28/25 2:17pm

First, it is recommended to have the vehicle replaced with a genuine idle speed motor at a 4S shop. After installing the genuine part, conduct a test drive for observation, as the issue is likely related to the idle speed valve. Improper assembly can also lead to high idle speed. Focus on inspecting the assembly condition of the throttle body and idle speed valve, and check for any air leakage.

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Parra

08/11/25 10:24pm

I've been driving for many years, and the most common issue after replacing the idle speed control valve is an abnormally high idle speed, usually caused by improper installation or misalignment, loose screws, or an intake connection that wasn't tightened properly, leading to small gaps and air leaks. You need to recheck if the motor is securely fixed, inspect the vacuum hose for cracks, and use a diagnostic tool to see if the data stream hasn't been reset. The solution isn't difficult: disconnect the battery's negative terminal for 30 seconds to let the ECU reset and relearn the idle speed, then start the car and wait a few minutes to see if it automatically drops. If it still doesn't work, the new valve might be defective or the TPS sensor could be faulty. It's best to take it to a repair shop for a professional check-up immediately, rather than forcing it to run and risk burning more fuel or damaging engine components. In short, step-by-step troubleshooting is the most efficient and safest approach.

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