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Our 2001 C2 Cabriolet has a somewhat irritating low rpm "drone" from the exhaust from 1500 up to around 3000 rpm. This is top of mind because the tiptronic is constantly seeking the highest gear possible, so it's always in this range (which is a separate topic).
Car is totally stock with only 21k miles on it.
Could the engine mounts have deteriorated over the last 25 years such that they could lead to this droning? The exhaust tip location looks fine (see pic below).
Car feels "like new" and very tight, noticibly more so than our 2004 C4S with 110k miles, so the rubber on the cab is in very good shape. This tells me the engine mounts might be fine.
Any ideas on what else could be causing a low rpm drone?
Our 2001 C2 Cabriolet has a somewhat irritating low rpm "drone" from the exhaust from 1500 up to around 3000 rpm. This is top of mind because the tiptronic is constantly seeking the highest gear possible, so it's always in this range (which is a separate topic).
Car is totally stock with only 21k miles on it.
Could the engine mounts have deteriorated over the last 25 years such that they could lead to this droning? The exhaust tip location looks fine (see pic below).
Car feels "like new" and very tight, noticibly more so than our 2004 C4S with 110k miles, so the rubber on the cab is in very good shape. This tells me the engine mounts might be fine.
Any ideas on what else could be causing a low rpm drone?
Don't assume the mounts are good. Unless they've been replaced, it's unlikely.
You say it's a droning sound. Have you had a friend ride with you that could sit in the back to narrow down the source of the drone? You might have an issue with the exhaust that is only notable in that rpm range but overwhelmed at higher revs.
Thanks for the brainstorming. I put "drone" in quotes because it's more of an overall low pitched "booming sound" throughout the cabin. It's nothing specific coming out of the exhaust itself but rather the whole back of the car. With another person in the passenger seat we've not been able to localize it to any degree. This is what got me thinking about motor mounts.
I'm curious if anyone here has proactively replaced motor mounts that didn't obviously look bad and had it solve an issue (drone, shift quality, etc.).
Thanks for the brainstorming. I put "drone" in quotes because it's more of an overall low pitched "booming sound" throughout the cabin. It's nothing specific coming out of the exhaust itself but rather the whole back of the car. With another person in the passenger seat we've not been able to localize it to any degree. This is what got me thinking about motor mounts.
I'm curious if anyone here has proactively replaced motor mounts that didn't obviously look bad and had it solve an issue (drone, shift quality, etc.).
Pry Bar Test
Jack the car up safely on jack stands and locate the mounts (they sit behind the rear wheels, securing the engine to the subframe).
Place a block of wood under the oil sump and lightly support the engine with a floor jack.
Use a pry bar to gently lever the engine up and down. If the rubber allows excessive movement or feels spongy, the mounts are broken.
Last edited by dglenn99; Yesterday at 01:05 AM.
Reason: Correction
Jack the car up safely on jack stands and locate the mounts (they sit behind the rear wheels, securing the engine to the subframe).
Place a block of wood under the oil sump and lightly support the engine with a floor jack.
Use a pry bar to gently lever the engine up and down. If the rubber allows excessive movement or feels spongy, the mounts are broken.
Google AI in the search engine actually. I forgot how I phrased it, but that was part of the response I thought was practical so I copied it and pasted it here.
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2001 c2 cab tip drone at 2k rpm
