Motor boating noise


#1

My 2005 Buick Century (3.1L v6) makes a loud propeller or motor boating noise when I get it up to 25 mph or more. The noise is rhythmic. It’s frequency increases when the speed increases. The engine is fairly quiet when idling or when I rev it in park.
I checked the transmission fluid, it was full and still had a red color and didn’t smell burnt.
I had the PS pump replaced last July, it has no leaks.
The engine is long overdue for an oil change, but the oil still has a nice brown color and I added some fresh oil whenever it needed it.
Could it be a worn internal engine part?
Could it be a transmission problem?
Could it be a worn engine mount that’s causing the engine to rub against the steering rack or some other part?
The car has about 148,000 miles, and I average about 26 mpg highway.
Any information will be appreciated.


#2

Tire or wheel bearing

A competent mechanic can figure it out by hooking up chassis ears and going for a test drive

And he’ll also put it on the hoist to check for the obvious


#3

but the oil still has a nice brown color - No such thing, a nice brown color is not something I want to see in the crankcase of anything I own.


#4

A torn CV axle boot flapping around?


#5

I would look for an exhaust leak at the exhaust manifold or the flex pipe.

https://www.rockauto.com/en/catalog/buick,2005,century,3.1l+v6,1430627,exhaust+&+emission,inner+&+outer+braid+flex+pipe,1000497

Either can make a puttering sound like a Motor boat.

Yosemite


#6

db4690, you were correct. I had my car serviced and it was the right front wheel bearing. Thanks a lot for your diagnosis. I hate to take my car to a mechanic and just tell him “It’s making a noise.”


#7

You’re welcome

And I’m glad to hear the car’s fixed

How did the mechanic determine it was the right front?

Was it super obvious when he had it on the hoist . . . rough or sloppy . . . or did he wind up using that chassis ears kit?

Did they use quality parts?

AC delco, timken, skf, or something else high quality?


#8

Why, that is what you are paying for ? Sure , you can say where you think it is coming from and try to describe it but most mechanics are used to that sort of thing.


#9

Thanks to you and a You Tube video, I diagnosed the problem for him. All he had to do was to confirm. I don’t know what brand of part he used. Maybe I should call and ask or take a better look at the receipt. I know Firestone is not the best place to have repairs, but it was the only nearby mechanic that’s open on a Sunday and I needed the car repaired soon. That bad wheel bearing was a hazard.