Warm engine misfires or makes knocking noises


Quality check:

  1. Start engine, allow to warm up and observe idle quality
    • engine should idle smoothly
    • engine should not misfire or knock
  2. With correct tire pressure, drive car on a level road
  3. Accelerate to a constant speed of 35 MPH
    • in 3rd gear (4-speed transmission)
    • in 4th gear (5-speed transmission)
  4. Accelerate again to full throttle and note the acceleration quality.
    • engine should accelerate evenly
    • engine should not misfire or knock
  5. Maintain steady speed and observe performance quality
    • engine should maintain even performance at all speeds and show no symptoms of misfire or knock

If test passed, return car to customer

If test failed, perform diagnosis III