Engine Speed Sensor: Description and Operation

1985 Plymouth Conquest L4-2555cc 2.6L SOHC TurboSECTION Description and Operation

The ignition coil generates electrical signals which are transmitted to the ECU. The ECU calculates time between electrical pulses to determine engine speed. This information is used to control fuel delivery time, EGR, secondary air management and idle speed.


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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.