1990 Suzuki Swift GLXFACTORY OEM SERVICE PROCEDURE

Idle Speed & Ignition Timing

Ensure idle speed and base ignition timing are set to specification. If necessary, see ADJUSTMENTS article.

IDLE SPEED SPECIFICATIONS (1)

Application Idle RPM
DOHC
With A/C Off 800-900
With A/C On (1) 850-950
SOHC
With A/C Off
Auto. Transaxle 700-800
Man. Transaxle 600-700
With A/C On
Auto. Transaxle (1) 800-900
Man. Transaxle (1) 850-950
(1) The A/C idle speed is adjusted by rotating adjusting screw on the A/C Vacuum Switching Valve (VSV).
IGNITION TIMING (Degrees BTDC @ RPM)

Application Man. Trans. Auto. Trans.
DOHC (1) 5-7 @ 800-900 (1) 5-7 @ 800-900
SOHC (2) 5-7 @ 600-700 (2) 5-7 @ 700-800
(1) Specification is listed with jumper wire installed between terminals "C" and "D" (Black and Violet/Green wires) of test connector, located near ignition coil.
(2) Specification is listed with vacuum hose disconnected from distributor. With hose connected, timing should be 11-13 degrees BTDC.
Factory Service Tools

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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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