How to Adjust Idle Speed for Sedans?

1 Answers
DeJayce
07/30/25 12:05am
To adjust the idle speed of a car, it is recommended to pull over safely and have it inspected at the nearest auto repair shop. The reasons for unstable idle speed are as follows: 1. Engine mechanical failures such as improperly closed valves or uneven cylinder compression. 2. Dirty throttle body or throttle damage in the air supply system. 3. Low fuel supply pressure or significant pressure fluctuations, severe carbon buildup in fuel injectors, etc. Generally, the more cylinders an engine has, the less noticeable the idle vibration. Inline six-cylinder engines, due to their inherent ability to balance vibrations, offer the best smoothness. On the other hand, the increasingly popular three-cylinder engines have poor inherent smoothness and require balance mechanisms to maintain normal operation.
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