|
|
•
suspension •
driveline •
air leakage (wind noise) •
squeaks and rattles •
heating ventilation and air conditioning (HVAC) •
electrical (e.g. motor noise) •
transmission •
engine It is important, therefore, that an NVH concern be isolated into its specific area(s) as soon as Noise Diagnostic Procedure Non-Axle Noise The five most important sources of non-axle noise are exhaust, tires, roof racks, trim and •
In certain conditions, the pitch of the exhaust may sound very much like gear noise. At •
Tires, especially snow tires, can have a high pitched tread whine or roar, similar to •
Trim and mouldings can also cause whistling or a whining noise. •
Clunk may be a metallic noise heard when the automatic transmission is engaged in •
Bearing rumble sounds like marbles being tumbled. This condition is usually caused Noise Conditions •
Gear noise is typically a howling or whining due to gear damage or incorrect bearing •
Chuckle is a particular rattling noise that sounds like a stick against the spokes of a •
Knock is very similar to chuckle, though it may be louder and occurs on acceleration Check and rule out tires, exhaust and trim items before disassembling the transmission to |