Pinpoint Test A: Drumming Noise

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK THE EXHAUST SYSTEM
- Start the engine.
- Increase the engine rpm until the noise is the loudest. Note the engine rpm.
- Ignition OFF.
- Add approximately 9 kg (20 lb) of weight to the exhaust system. First place the weight at the tail pipe and test, then at the front pipe.
- Start the engine.
- Increase the engine rpm and listen for the drumming noise. Note the engine rpm if the noise occurs.
- Ignition OFF.
- Remove the weight from the exhaust system.
- Is the noise/vibration reduced or eliminated, or does the noise/vibration occur at a different rpm?
- Yes : REFER to EXHAUST SYSTEM ALIGNMENT . TEST the system for normal operation.
- No : CONDUCT a diagnosis on other suspect systems. REFER to NOISE, VIBRATION & HARSHNESS .