A 1993 annual production Honda Accord CB3 sedan, equipped with F20A3 engine and manual transmission. Due to the vehicle during the start of the engine near the engine issued a "creak" sound, come to our factory maintenance.
    After the vehicle into the factory, the author of the car road test. At the start of the vehicle, it is indeed heard that there is a dry friction "creak" sound that occurs when there is a similar mechanical component relative to the surface of the joint. When the vehicle starts to run at a constant speed, the sound disappears. When you press the accelerator pedal for rapid acceleration, you will occasionally hear the sound. The vehicle back to the factory after the engine idle or increase the throttle, but no abnormal sound appears.
    Will not be open air conditioning, air conditioning system within the refrigerant flow issued by the "creak" sound it? We have encountered a similar phenomenon, diagnosed as air conditioning system abnormal sound, does not belong to the mechanical friction abnormal sound. Later, we do not open the air conditioning system in the case, and then road test, the results still exist, so the exclusion of the possibility of air conditioning system failure.
    Next, the author in the vicinity of the engine for auscultation. Because the abnormal sound only when the vehicle starts or driving to increase the throttle, will occasionally issue a "creak" abnormal sound, other conditions will not appear abnormal sound, abnormal sound appears only a few seconds time, while Not ringing, random large. Due to abnormal sound sometimes, to the diagnosis work to bring very big difficulties. Routine road test can only hear abnormal sound issued in the vicinity of the engine, but can not correctly determine the exact location of abnormal sound. Now only the vehicle in the vicinity of the repair shop for slow start and accelerated test. I follow the vehicle while walking auscultation, when the abnormal sound appears to determine the sound from the transmission or adjacent parts, but the specific parts of the transmission or the front of the clutch clutch, or the engine before the flywheel has not yet been determined, After the general determination, we decided to dismantle the transmission for diagnosis.