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Home >> Saab >> 1987 >> 9000 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - LH (16-Valve) >> Adjustments >> Fuel Injection Base Line Value Adjustment
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Fuel Injection Base Line Value Adjustment

NOTE: The following is to only be performed if ECU, air mass meter, or temperature sensor is replaced, or if a major part(s) of engine (cylinder head, engine block, timing chain, etc.) is replaced or rebuilt.
  1. Remove sealing plug covering potentiometer screw (located on side of air mass meter). Remove harness connector from air mass meter. Connect ohmmeter between pins No. 3 and 6 of air mass meter. Resistance should be 380 ohms. If resistance is incorrect, adjust potentiometer screw. Reconnect air mass meter connector.
  2. Connect Pulse Ratio Meter (85 93 597) and Adaptor Harness (021 80 701) to 3-terminal limp-home test connector (located near A/C evaporator). Start engine and run until cooling fan cycles.
  3. If base line value is correct, ratio meter reading will oscillate slowly and evenly between both ends of scale. A pause between ratio meter fluctuations is acceptable. If okay, stop engine, disconnect ratio meter and install sealing plug. If fluctuation is uneven or mostly on high or low side of scale, go to next step.
  4. If needle is most often at high side of scale, turn potentiometer screw counterclockwise to adjust. If needle is most often at low side of scale, turn potentiometer screw clockwise to adjust. After adjustment, stop engine, disconnect ratio meter and install sealing plug.
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