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.