Inspection Procedure 9: There is Noise when Starting the Engine.



DIAGNOSIS PROCEDURE



caution
  • Connecting a high tension cable to the noise filter may destroy the noise filter and should never be done.
  • Check that there is no external noise. Since failure to do this may result in an incorrect diagnosis due to the inability to identify the noise source, this operation must be performed.
  • Noise prevention should be performed by suppressing strong sources of noise step by step.
Noise type sounds are in parentheses
Conditions
Cause
Remedy
LW/MW/FM: ignition noise (popping, snapping, cracking, buzzing)

  • Increasing the engine speed causes the alternator whine sound to speed up and the volume to decrease
  • Disappears when the ignition switch turned to "ACC."


  • Mainly due to the spark plugs
  • Due to engine noise


  • Check or replace the earth cable.

Other electrical components
-
Noise may occur as the electrical components become older.
Repair or replace the electrical components.
Static electricity (cracking, crinkling)

  • Disappears when the vehicle is completely stopped.
  • Severe when the clutch is engaged

Occurs when parts or wiring move for some reason and contact metal parts of the body.
Return parts or wiring to their proper position.
Static electricity (cracking, crinkling)

  • Various noise are produced depending on the body part of the vehicle.

Due to removal of the front hood, bumpers, exhaust pipe and muffler, suspension, etc.
Earth parts by bonding. Cases where the problem is not eliminated by a signal response to one area are common, due to several body parts being imperfectly earthed.