Pinpoint Tests

Diagnostic Routine A

Diagnostic Overview

Drumming Noise

Pinpoint Test

1. CHECK THE EXHAUST SYSTEM

1. Start the engine.

2. Increase the engine rpm until the noise is the loudest. Note the engine rpm.

3. Ignition OFF.

4. Add approximately 9 kg (20 lb) of weight to the exhaust system. First, place the weight at the tail pipe and test. Repeat at the front pipe.

5. Start the engine.

6. Increase the engine rpm and listen for the drumming noise. Note the engine rpm if the noise occurs.

7. Ignition OFF.

8. Remove the weight from the exhaust system.

Is the noise/vibration reduced or eliminated, or does the noise/vibration occur at a different rpm?