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HOMESERVICE MANUALSSAAB1990900 S, 2D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/O CODESPOOR RESPONSE ON ACCELERATION
1990 Saab 900 S, 2D Hatchback, Automatic

Poor Response On Acceleration

1990 Saab 900 S, 2D Hatchback, AutomaticSECTION Poor Response On Acceleration
  • Check for proper CO setting on mass airflow meter and for broken filament. Check mass airflow meter resistance.
  • Check induction system. Check for air leaks downstream of throttle valve, using pressure tester. Pressure should be 5.8-11.6 psi (.4-.8 kg/cm2 ). Visually inspect between mass airflow meter and throttle housing.
  • On 900 Series vehicles equipped with catalytic convertors, check idle speed and pulse ratio.
  • Check injector operation and opening duration. Check injectors for leaks.
  • Ensure fuel pump is operating. Check fuel pressure and pressure regulator. Check for leaks or restrictions.
  • Ensure electrical harness, connectors and wires are not broken or loose. Check all input signals to ECU.
  • Check temperature sensor operation.
  • On 900 Series, check oxygen sensor resistance and voltage.
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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.