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HOMESERVICE MANUALSSAAB1990900 BASE, 2D CONVERTIBLE, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/O CODESLACK OF POWER
1990 Saab 900 Base, 2D Convertible, Automatic

Lack Of Power

1990 Saab 900 Base, 2D Convertible, AutomaticSECTION Lack Of Power
  • 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.
  • Check throttle valve for binding and proper adjustment. Ensure throttle valve opens completely.
  • Ensure fuel pump is operating. Check fuel pressure and pressure regulator. Check for leaks or restrictions.
  • Check injector operation one at a time. Engine RPM should drop noticeably. Check opening duration. Check injectors for leaks.
  • Ensure mass airflow meter filament is not broken and burn-off function is working.
  • Check turbo and Automatic Performance Control (APC) stems for proper operation.
  • Check coolant temperature sensor operation.
  • Ensure electrical harness, connectors and wires are not broken or loose. Check all input signals to ECU.
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.