Additional Checks
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
- Check for vacuum leaks. Vacuum leaks can cause a higher than normal idle speed.
- Verify the PCM grounds are in the proper locations, with clean, tight connections.
- Check scan tool to determine if PCM is receiving an A/C signal. Idle speed should be increased with A/C ON. See ELECTRICAL/ACCESSORY LOAD IDLE-UP SIGNAL under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - 1.8L VIBE article.
- Inspect the battery cables and the ground straps. Ensure they are clean and tight.
- Inspect A/C refrigerant pressure for being too high or for a faulty high pressure switch. See appropriate MANUAL A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
- Test for the proper operation of the IAC system. See IDLE AIR CONTROL SYSTEM under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - 1.8L VIBE article.
- The engine will run rough and the engine can stall if the Camshaft Position (CMP) actuator solenoid is advancing camshaft timing at idle. Inspect for a fully energized or stuck CMP actuator solenoid. If the operation of the CMP actuator solenoid is suspect, see DTC P1349: INTAKE CMP SYSTEM PERFORMANCE under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 1.8L VIBE article.
- Check Positive Crankcase Ventilation (PCV) valve for correct operation and the correct part.
- Inspect that the idle speed is increasing for changes in electrical loads on the engine. See ELECTRICAL/ACCESSORY LOAD IDLE-UP SIGNAL under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - 1.8L VIBE article.
- Verify PCM is increasing the idle speed when P/S system pressure is increased on turns. See ELECTRICAL/ACCESSORY LOAD IDLE-UP SIGNAL under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - 1.8L VIBE article.
- Check for broken or worn motor and transmission mounts