open the trunk and let your spouse out.
i don't know if it helps, but my '99 legacy outback was making a knocking sound. turned out that the oring on the brake caliper pin had worn out, and the pin was kind of knocking around.
Pipes make a knocking sound when the water is turned off due to a phenomenon called water hammer. This happens when the flow of water is suddenly stopped, causing a pressure wave to travel through the pipes and create the knocking noise.
If it is deep in the engine, the engine may need repaired/replaced.
Your rear tire could be making a knocking sound for a number of reasons. You could have a damaged strut or axle that needs replacing.?æ
the a/c pump could be loose.check to see if the bolts are tight.
IT is your CV Joints which is making this noise.
Could be a worn CV joint
The knocking problem you are having is most likely the gas you are using. If you switch to a higher octane fuel it should solve the problem.
In all likelihood, something actually is making a knocking sound near the room where you are sleeping. Your unconscious mind is weaving that sound into a dream as a way of preventing you from being disturbed and waking up.
Woodpeckers are known for making a knocking sound, especially during the early morning or at night when they are more active. Their rhythmic tapping on trees or structures can be mistaken for repetitive knocking sounds.
Valve train
Might be a cracked vacumn hose, there are plenty, and the age is about right for this to happen.