Practice question

A coolant (engine) temperature sensor (ECT) that reports a falsely cold reading to the ECU will most likely cause:

  1. A lean mixture and easy hot starting
  2. A rich mixture, poor fuel economy, and possible fouled plugs as the ECU adds warm-up enrichment
  3. Higher tire wear
  4. Brake fade

Answer: B — A rich mixture, poor fuel economy, and possible fouled plugs as the ECU adds warm-up enrichment

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