1984 Pontiac Fiero Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Data Sensors: Notes

Each sensor furnishes an electrical signal to ECM, modifying injector pulse to conform to engine operating conditions. These sensors are as follows:

Coolant Temperature Sensor (CTS)

The CTS is located in the thermostat housing. This sensor is a variable resistant (thermistor) type which transmits an electrical signal (proportionate to engine temperature) to the ECM.

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.