What to Do When the Engine RPM Drops Slowly After Releasing the Throttle?
2 Answers
Solutions for slow RPM drop after releasing the throttle: Check the engine fuel injection system, RPM sensor, and oxygen sensor for any issues. If there is a malfunction in the engine fuel injection system, the fuel injectors may not stop supplying fuel in time, leading to an overly rich air-fuel mixture and causing the engine RPM to drop slowly. If the RPM sensor is faulty, it may fail to promptly reflect RPM changes on the dashboard. This issue can be resolved by replacing the RPM sensor. The proper functioning of a car engine relies on various sensors and electronic components. If any of these sensors malfunction, it may affect the engine's normal operation.
My car had the same issue before. The RPM drops slowly after releasing the throttle, likely due to excessive carbon buildup in the throttle body causing it to stick. I would first check if the throttle body is dirty. You can disassemble and clean it yourself, or have a mechanic do it at a repair shop. If it's a carbon deposit problem, regular use of fuel additives can help prevent it. Additionally, a loose throttle cable or electronic throttle system wiring connector might also cause delay, so check those connection points. If cleaning doesn't solve it, then you'll need to check if the engine control module is malfunctioning, which may require professional diagnostic equipment. Safety first—never ignore this issue. Unstable RPM at high speeds is dangerous, so address it early to avoid major repairs. Cost-wise, cleaning the throttle body only costs a few dozen RMB, while replacing a faulty sensor could run a few hundred. DIY saves money, but be careful.
