Why does the idle speed stay at 2000 RPM and won't drop?

[SanElliot]

Reasons and solutions for the idle speed staying at 2000 RPM are as follows: Reasons for high idle speed: The carburetor throttle return spring is too soft; Carburetor gasket leakage; Excessive idle jet size; Loose throttle shaft; Poor operation of individual cylinders; Intake manifold leakage due to improper fixation; Brake vacuum booster air valve leakage or other vacuum pipe leakage; Distributor contact gap too small; Or possibly excessive carbon buildup. Solutions: Turn on the air conditioning and rotate the steering wheel while idling. If the idle speed doesn't increase further, it indicates the idle switch isn't closing, which can be resolved by adjusting or replacing the throttle position sensor; If high idle is caused by intake pipe leakage, it can be fixed by sealing or replacing related components; Clean and inspect each fuel injector's spray quantity and check for blockages or leaks; If excessive carbon buildup causes high idle speed, promptly clean the throttle body and idle air control valve to resolve the issue.

[OCali]

Once my car's idle speed kept staying above 2000 RPM, causing fuel consumption to skyrocket and worrying me about engine overheating. It could be that the throttle body accumulated too much oil sludge, jamming the air intake, or the air filter was clogged affecting airflow. It might also be a faulty idle control valve unable to adjust, or malfunctioning sensors like the oxygen sensor sending wrong signals to the ECU. Start with simple fixes: remove and clean the air filter, clean the throttle body and fuel system, and see if the RPM drops. If not, check if the spark plugs are worn out causing poor ignition, or if there's a vacuum leak making the air-fuel mixture too rich. Prolonging this issue may harm engine efficiency. I recommend visiting a repair shop to read trouble codes with a diagnostic tool and fix it early for peace of mind and safety. Avoid DIY tinkering to prevent further problems.

[DelaneyRose]

Idle speed stuck at 2000 RPM and won't drop? As a car enthusiast who loves tinkering, I'd guess it's mostly an electronic control system issue. A dirty mass airflow sensor can send false intake data, while a faulty throttle position sensor might cause the ECU to misjudge idle conditions. There could also be ECU programming issues or clogged fuel injectors affecting the air-fuel mixture, resulting in high RPM. Don't forget to check for worn ignition coils or incorrect spark plug gaps causing irregular ignition that manifests as abnormal idle. Connecting an OBD scanner to check trouble codes can quickly pinpoint the problem - common culprits include MAP sensor errors or idle air control valve failure. Prolonged high idle speeds accelerate engine wear and increase emissions. Get it fixed ASAP. For DIYers, start by cleaning intake system components to ensure no blockages.

[DawsonLynn]

My car once had an idle speed stuck at 2000 RPM, which was really fuel-consuming and noisy. It's mostly caused by a dirty throttle body or a clogged air filter affecting normal air intake and causing the RPM to get stuck. First, check if the air filter is clean—replace it if dirty; cleaning the throttle body might solve the problem. It could also be due to a stuck idle control valve or sensor failure, but these issues are harder to handle yourself—try resetting the battery for a few minutes to restart the ECU, and if that doesn't work, take it to a professional shop for inspection. High idle speed is harmful to the engine, increasing the risk of overheating and shortening its lifespan. Safety first—don't force it to run, and perform regular maintenance to avoid similar issues.