Additional Checks
- An Idle Air Control (IAC) system that is malfunctioning can cause a hard start condition. Hold throttle open slightly while starting the engine. After vehicle is started, the scan tool can be used to check the IAC valve operation. Operate the IAC valve using the scan tool while checking for a smooth increase and decrease in engine speed. If engine speed can be controlled, IAC system is functioning normally. If engine speed cannot be controlled using the scan tool, refer to DIAGNOSTIC AIDS under DTC P0505: IDLE CONTROL SYSTEM under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 1.8L VIBE article.
- If the engine stalls after starting, check for a fault in the CMP Actuator System or the Rocker Arm Oil Control System. A stuck On control solenoid can cause the engine to stall at idle speeds. See DTC P1346: INTAKE CMP SYSTEM PERFORMANCE and DTC P1692: ROCKER ARM ACTUATOR SYSTEM STUCK ON under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 1.8L VIBE article.
- Check Technical Service Bulletins for any updates.