1. Check for vacuum leaks: Inspect all vacuum hoses, lines, and connections for any leaks or cracks. A vacuum leak can cause the engine to run rich and idle high. Pay close attention to the hoses and lines that connect to the intake manifold, throttle body, and MAP sensor.
2. Clean MAP sensor: Remove the MAP sensor from its location and clean it with a suitable solvent. Dirt or debris on the sensor can cause it to send inaccurate air pressure readings to the engine control unit (ECU), which may result in high idling. Make sure the MAP sensor is seated properly when you re-install it.
3. Test MAP sensor: Perform a MAP sensor test to ensure that it's functioning properly. This usually involves measuring the voltage or resistance of the sensor at different pressure levels. Refer to the specific procedures for testing the MAP sensor in your Del Sol's service manual or online resources.
4. Inspect intake system: Check the intake system, including the intake manifold, throttle body, and air filter for any obstructions or blockages. A clogged or dirty intake can cause the engine to run rich and idle high. Clean or replace the affected components as necessary.
5. Check for ECU errors: If the issue persists, it's possible that there's a fault with the ECU. Connect an OBD2 scanner or take the car to a mechanic to check for any error codes stored in the ECU's memory.
6. Consult a professional: If you're unable to find and resolve the cause of the high idling after trying the above steps, it's advisable to consult a professional auto technician or a Honda specialist for further assistance and proper diagnosis.
