Inspection Procedure 8: 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 types ( ) indicates the sound type.	Situation	Cause	Countermeasure
Ignition noise: (Crack, tapping, rattle, plash)	When the engine speed is increased, the scratch noise becomes faster and the sound volume decreases. When the ignition switch is turned to ACC, the noise disappears.	Radiation noise caused mainly by the spark plug Noise wraparound	Check the earth cable, and replace if necessary. (Refer to the figure below.)
Wiper motor noise: (hum, distorted hum)	Synchronised with the wiper movement, and also becomes faster when wiper movement is sped up. When the wiper is stopped, the noise also stops.	Noise generated by the wiper motor operation	Check the wiper motor (Refer to GROUP 51 - Windshield Wiper, Inspection .), and replace if necessary.
Static electricity (cracking, popping)	No noise is generated when the vehicle comes to a complete stop. Louder noise is generated when the clutch is disengaged.	The parts or wiring move for some reason, and cause the noise by contacting against the body metal parts.	Return the parts and wiring to the normal positions.
Static electricity (cracking, popping)	Various types of noise are generated in various parts of the body.	Caused by the looseness between the body and the hood, trunk lid, bumper, exhaust pipe and muffler, suspension, or others.	Securely tighten the mounting bolts of each part.
Noise from other electrical equipment	-	The noise may be generated when the electrical equipment become old.	Repair or replace the electrical equipment.