86 Subaru Manual Transmission making air raid siren noise
The noise is really loud. People will start pulling over when I drive down the road! It seemed like at the same time, or maybe earlier in the day, a possible fuse went?... the stereo, clock, wiper stopped working. Noise started after I filled the tank with gas from almost empty. Also sounds like industrial vaccuum cleaner. It seems to be coming from under the spare tire.
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Tons of possibilities here (transmission, differential, motor mounts, transmission mounts....), so I'll ask some debug questions to help narrow it down. Does it make the noise when shifting into reverse? Also, does it make the noise only when shifting from park, or also when shifting from neutral (into drive or into reverse)? Did the noise start as an occasional, softer noise and get worse over time, or did it start suddenly? Does the vehicle lurch at the same time as the noise? What happens when you go from Reverse to Drive, or vice versa? Has any work been done recently (brakes, tires, alignment, suspension, transmission)?
Is your 2003 Subaru Outback automatic or manual transmission? If it is automatic, then your transmission sounds like it's malfunctioning into the reverse gear as it is not aligning properly. If it is manual, then your transmission sounds like it may have a bad clutch or bad reverse gear. Either solution is not cheap. Good luck.
HELLO; IF THIS NOISE IS COMING FROM THE DRIVER SIDE FRONT WHAT YOU ARE HEARING IS THE ELECTRIC AIR PUMP WHICH IS NORMAL UNLESS IT IS REALLY LOUD OR MAKING A GRINDING NOISE. tHIS PUMP IS PART OF THE EMISSION SYSTEM.