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Propeller-like Sound while Driving the car

4 messages,  Last post on Jun 12, 2008 at 7:57 AM

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#1 of 4 Propeller-like Sound while Driving the car by cadowner May 15, 2008 (12:20 pm)
I have a 2001 Cadillac Seville STS with 91,000 miles. Recently, while 'driving' the car there is a propeller-like sound that comes from the front half of the car. This sound comes up (or is audible) after the car is driving above 15 mph. The sound frequency/pitch increases & decreases with speed variance. Higher the speed, the more intense is the sound pitch. (It is somewhat similar to putting a card against the spokes of a bicycle and riding, except the sound is more like a propeller of a toy remote airplane). However, when the car is standing idle and I rev up the engine even to high rpm, there is NO sound. It comes up only when the car is driving. I ran the in-dash diagnostic and the problem code ABS C1287 came up, which perhaps is not related to this sound. Any idea what the problem could be? Will appreciate your feedback. Replies to this message: belltax (Jun 10, 2008 6:47 pm) sls002 (Jun 12, 2008 7:57 am)
#2 of 4 Re: Propeller-like Sound while Driving the car [cadowner] by belltax Jun 10, 2008 (6:47 pm)
Replying to: cadowner (May 15, 2008 12:20 pm) Yep, that's a front motor mount. They are heavy oil-filled mounts and they retail for almost $300. each. Then you'll pay about five hours labour to get the old one out and the new one in.   The motor mounts rubber exterior deteriorates, and then the oil leaks out, and then the mount does not stop the motor from torquing sideways, so the motor moves too much now, and the noise you hear is the engine grinding against other parts of the car, a vibrating noise, sort of propeller-like, if you will, under load. Once you are moving and the engine torque is minimized, the grinding and noise are non-existent. Get a $1000.00 bill ready. Why do Caddys have oil-filled motor mounts? Because that's how Caddy engineers designed the mounts to that the engine torque is so controlled and smooth and this translates into exceptionally smooth shifts between gears. No clunking as the engine torques through rpms. Great smoothness, but great repair costs. Isn't it just fun to drive a Caddy? I thought so too. Replies to this message: sls002 (Jun 12, 2008 7:57 am)
#3 of 4 Re: Propeller-like Sound while Driving the car [belltax] by sls002 Jun 12, 2008 (7:57 am)
Replying to: belltax (Jun 10, 2008 6:47 pm) Well you bought the Cadillac for the smoothness, so you should expect replacement parts to cost more. OR, you should have bought a Chevy. At 100,000 miles one should expect some maintence costs. I would suggest that replacing all of the mounts might save future replacement costs as the other mounts may be getting close to failure too. The real question is how long will you keep the car.

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