1990 Geo Storm Base, Automatic, F3A/MX1FACTORY OEM SERVICE PROCEDURE

Crank Angle Sensor

Computerized fuel injected systems use a tach (RPM) reference signal to determine when vehicle is running and when coil and/or injectors should be triggered. Crank angle sensor is incorporated within pick-up coil unit and is adjusted by same procedure as pick-up coil.

Fig 1: Identifying Ignition Coil Connector Terminals
G90B14945Courtesy of GENERAL MOTORS CORP.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.