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HOMESERVICE MANUALSHYUNDAI1990EXCEL BASE, 2D HATCHBACK, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSEMISSION SYSTEMS & SUB-SYSTEMSFUEL EVAPORATIONSYSTEM TEST
1990 Hyundai Excel Base, 2D Hatchback, Standard

System Test

1990 Hyundai Excel Base, 2D Hatchback, StandardSECTION System Test
  1. Disconnect Red-striped vacuum hose between throttle body and purge control solenoid valve at throttle body. Connect a hand-held vacuum pump to disconnected vacuum hose. Plug nipple on throttle body where vacuum hose was removed.
  2. With engine temperature at 140°F (60°C) or less and engine idling, apply 14 in. Hg. Vacuum should hold. Raise engine speed to 3000 RPM and again apply 14 in. Hg. Vacuum should hold.
  3. With engine coolant temperature at 158°F (70°C) or more and engine idling, apply 14 in. Hg. Vacuum should hold. Turn engine off. Start engine and within 3 minutes of starting engine, apply vacuum. Vacuum should bleed down.
  4. With engine running for more than 3 minutes after starting, raise engine speed to 3000 RPM and apply 15 in. Hg. Vacuum should hold momentarily and then bleed down.
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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.