Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Idle Speed
Manufacturer does not list procedure for checking idle speed. Idle speed is controlled by PCM. No adjustment is required. PCM controls Idle Air Control (IAC) motor for proper idle speed. Individual component testing is not available. If Idle Air Control (IAC) motor or wiring circuit failure exists, a DTC may be stored in the powertrain control module. Perform appropriate IAC motor diagnostic test. See DTC P0508: IAC VALVE SENSE CIRCUIT LOW or DTC P0509: IAC VALVE SENSE CIRCUIT HIGH in SELF-DIAGNOSTICS - CONCORDE, INTREPID & 300M article.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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