1990 Suzuki SamuraiFACTORY OEM SERVICE PROCEDURE

Idle Speed & Ignition Timing

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

IDLE SPEED SPECIFICATIONS (1)

Application Idle RPM
With A/C Off 750-850
With A/C On (2) 950-1050
(1) Idle speed specification is with trans. in Neutral or Park.
(2) The A/C idle speed is adjusted by rotating adjustment screw on A/C Vacuum Switching Valve (VSV)
IGNITION TIMING (Degrees BTDC @ RPM)

Application Man. Trans. Auto. Trans.
Samurai (1) 7-9 @ 800 N/A
(1) Specification is listed with jumper wire installed between terminals "C" and "D" (Black/Green and Blue wires) of test connector, located near the battery.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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