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This purring noice occurs when you pet a guinea pig too rough, and like you said, when loud noices such as the telephone or the dog barking startle it. It is basically just a noice it makes when it is startled.
a very loud noice
Loud buzzing noice in an ac controler
You need to see a mchanic BADLY!!!!
The startle reflex.
to be cool
Could be wheel bearing, differential bearings or maybe exhaust has moved and is vibrating on chassis or body.
My guess would be that your FUEL PUMP is going bad. When a fule pump goes bad the car will stall and or start to run rough. Hope this helps. I have all Chrysler cars and this has been my expeirence on them.
Loud
your engine is loud because, the fan makes that noise
In my case, the loud noises are me screaming when I fall.
Cylinder head valves. Try slightly thicker oil.