Bogging sound at about 10 to 20 MPH?

MCVAY78

MEMBER
2009 FORD MUSTANG
4.6L
V8
2WD
AUTOMATIC
180,000 MILES

The car drives fine until I'm about to pull in or just going about 10 to 20 MPH. It sounds like the exhaust bogs down and the only way I can get it to stop is to come to a complete stop. And even then, it will make a knocking noise before it stops. It won't do this unless I'm on the road for over 10 minutes though.

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

When I hear the word bogging, it indicates a lack of power from the engine. Have you noticed power loss?

If possible, could you record the sound and upload it for me to hear?

Let me know. Also, Happy 4th!

Joe

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Wednesday, July 3rd, 2024 AT 7:53 PM

MCVAY78

MEMBER
3 POSTS

There is no power loss until this happens and it only does when I'm not pushing on the gas and between 10 and 20 MPH.

Video (Click to make bigger)

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Thursday, July 4th, 2024 AT 7:33 AM

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

I watched the video. I really don't like the engine sounds I'm hearing. It sounds like a lot of metallic sounds when it happened. Am I hearing it correctly? Pay attention if the sound is present regardless of speed and at the same RPM. In other words, if the engine RPMs are 1500 when this happens, see if the same thing will happen at 40 at the same RPMs.

Let me know.

Joe

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Thursday, July 4th, 2024 AT 7:45 PM

MCVAY78

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It only does this when I'm going about 10 to 20 MPH. I never have any problem going any faster. The car shifts perfectly and still has all the power it should. Until then. And the only way I've found to make it stop is to gas on it while that sound is going on or to come to a compete stop. But then it usually happens again. But it takes a bit. I have to drive it for about 20 minutes maybe before that happens.

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Thursday, July 4th, 2024 AT 9:20 PM

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

That is an odd one. What I would suggest is to have the can-bus scanned.

CAN stands for controller area network. Basically, all the different modules are tied together via a few wires. This type of scan will retrieve codes regardless of the module storing it.

Here is a link that shows how it's done:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

If the problem would happen at any speed/RPM, I would think there was a fuel pressure issue. However, since it is so limited, I would try this to see if there are any codes stored. Otherwise, it will become a guessing game, and that can get expensive.

Let me know your thoughts.

Joe