What Causes Excessive Engine RPM in Cars?
2 Answers
Car engine RPM is excessively high due to: 1. Sudden increase in throttle opening; 2. Fuel injector dripping or clogging; 3. Slippage or damage to the air conditioning clutch; 4. Air intake system leakage; 5. Insufficient engine power output. Solutions for excessive engine RPM include: 1. Adjusting throttle opening; 2. Replacing fuel injectors, air conditioning clutch, engine, or transmission; 3. Adjusting the air intake system; 4. Adding compatible engine oil. An engine is a machine that converts other forms of energy into mechanical energy, categorized into: external combustion engines, internal combustion engines, gas turbines, and jet engines.
I've encountered the issue of excessively high engine RPM before, and there are quite a few common causes. One is throttle body problems, such as sticking or excessive carbon buildup preventing the throttle from returning, which naturally causes RPM to surge. Another possibility is a faulty throttle position sensor sending incorrect opening information to the ECU, leading to excessive fuel injection. Air intake system leaks are also serious - for example, a cracked vacuum tube sucking in extra air and disrupting the air-fuel mixture. In automatic transmission vehicles, incorrect gear selection (like driving in low gear) can easily cause RPM spikes. I recommend using an OBD scanner to read trouble codes, or simply cleaning the throttle body often solves the problem. Regular maintenance is crucial - I personally check idle conditions monthly to prevent minor issues from escalating.
