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HOMESERVICE MANUALSSUZUKI1990SWIFT GL, 2D HATCHBACK, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/O CODESROUGH OR UNSTABLE IDLE
1990 Suzuki Swift GL, 2D Hatchback, Standard

Rough Or Unstable Idle

1990 Suzuki Swift GL, 2D Hatchback, StandardSECTION Rough Or Unstable Idle
  • Check for play in throttle cable.
  • Check for contaminated fuel.
  • Check for clogged air filter.
  • Check for vacuum leaks.
  • Check cooling system.
  • Check compression.
  • Check spark plugs.
  • Check idle speed.
  • Check fuel pressure.
  • Check for cracked distributor cap.
  • Check ignition and valve timing.
  • Clogged MAP sensor (pressure sensor) vacuum hose (if equipped).
  • Check for faulty ECM.
  • Check for faulty air valve (if equipped).
  • Check for faulty coolant (water) temperature sensor.
  • Check for faulty air temperature sensor (if equipped).
  • Check for faulty A/C vacuum switching valve (if equipped).
  • Check for faulty Idle Speed Control (ISC) solenoid valve (if equipped).
  • Check for faulty throttle opener system (if equipped).
  • Check for malfunctioning EGR valve (if equipped).
  • Check for malfunctioning PCV valve.
  • Check for malfunctioning electronic fuel injection system.
  • Check for worn distributor terminals.
  • Ensure sufficient secondary spark is available.
RENDER: 1.0x

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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.