Noise diagnosis

NOISE DIAGNOSIS

The increasing sophistication of cars and the ever higher interior comfort have recently highlighted problems of noise, vibrations and wind noise.

Because of this, a diagnosis section has been dedicated to this type of problem.

We should like to emphasise that the customer interview and road test are fundamental steps in identifying the fault and that they indicate the correct starting point for satisfactory diagnosis.

With the customer it will be necessary to focus the fault with a set of questions.

1. How did the problem start to occur?
2. On what type of road is it possible to note the problem?

3) Does the problem depend on the temperature?

4) Define the type of noise well

5) If there is vibration, from where is it noted?

Through road tests, certain points should be assessed such as:

1. Whether the problem occurs with the change of engine speed, transmission or wheels
2. The problem depends on the speed of the car
3. The problem depends on engine speed
4. The problem occurs: during normal driving, at constant speed. during deceleration or acceleration
5. The problem occurs when cornering

For this reason a GLOSSARY, is given below which is helpful in avoiding wrong interpretations of symptoms which are often very subjective, concerning faults connected with particular noises.

Glossary