1991 Suzuki Swift GTFACTORY OEM SERVICE PROCEDURE

Idle Speed & Ignition Timing

Ensure idle speed and base ignition timing are set to specification. If necessary, see ADJUSTMENTS article in the ENGINE PERFORMANCE Section.

IDLE SPEED SPECIFICATIONS (1)

Application Idle RPM
DOHC
With A/C Off 800-900
With A/C On (2) 850-950
SOHC
With A/C Off
Auto. Transaxle 800-900
Man. Transaxle 700-800
With A/C On
Auto. Transaxle (2) 800-900
Man. Transaxle (2) 850-950
(1) Idle speed specification is with transaxle or transmission in Neutral or Park.
(2) 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.