Oldsmobile Cutlass Ciera high idle issue with moisture from tailpipes after changing idle air control valve and throttle position sensor on Oldsmobile Cutlass Ciera

Some Oldsmobile Cutlass Ciera owners report experiencing high idle issues after changing the idle air control valve and throttle position sensor, with moisture from the tailpipes potentially contributing to the problem. These issues may arise from moisture entering the back spark plug tubes due to water getting under the hood through the cowl panel seal, which can affect engine performance as the engine warms up. Additionally, dirt, debris, and oil contamination can clog the idle air control valve's air passages, impairing its ability to regulate airflow and leading to high idle conditions. Fuel leaks may also cause an imbalance, allowing more air than fuel into the system, which can further exacerbate the high idle issue. Furthermore, vacuum leaks should be checked, as they can also contribute to elevated idle speeds. It is advisable for owners to inspect for moisture-related issues, ensure proper sealing to prevent water entry, and address any potential vacuum leaks to effectively troubleshoot and resolve the high idle problem.