Easy step by step guide on how to fix an automotive engine whistle, this information
is displayed in order of probability and pertains to most vehicles.
Difficulty Level - 3
Start with the vehicle parked on level ground, engine off and the emergency brake
set, using a basic set of tools wearing safety gloves and eye-wear protection.
Step 1 - When a vacuum hose or tube fails it can make a whistling noise
which could vary with engine speed.