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 & Ignition Timing: Notes
Ignition timing and idle speed are controlled by the Engine Control Module (ECM) or Powertrain Control Module (PCM). Idle speed has been adjusted with the fixed Speed Adjusting Screw (SAS) by the manufacturer. SAS should not need readjusting unless it has been tampered with. For adjustment procedure, see BASIC IDLE SPEED and FIXED SPEED ADJUSTING SCREW (SAS) under IDLE SPEED & MIXTURE in ON-VEHICLE ADJUSTMENTS 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.