Under Bonnet Noises
Page created by T Oct 15th 2007:
Under Bonnet Noises:
The Pinch Test:
Pinch each rubber hose shut with flat pliers to see if any squeals disappear. Also good for troubleshooting rough idle symptoms.
The Stethoscope Test:
Get a vacuum cleaner hose. Hold one end to your ear and point the other at parts of the engine to help isolate noise sources.