Resonance on exhaust around 2.000 rpm

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Baxter
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Resonance on exhaust around 2.000 rpm

Post by Baxter » Sat Jan 23, 2016 6:09 pm

I have a noise resonance at 2.000 rpm. Starts around 1.800 up to 2.300 more or less. It comes from the engine bay, and it doesn't change moving the engine when it's running so I discard the engine mounts. I think it is the exhaust but no leaks has been found.

It sounds with the car stopped or running.

It has been reduced after I've done 1.500kms wirh the car, now it is not so loud, but still there. Anyone has something similar?

I see this silent block in bad condition but I don't think it can be the cause.

Image

It would be nice to solve it now, that the interior is very quiet. Not bad for a 20 years old car.

Any ideas?
Hector.

Alan 480
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Re: Resonance on exhaust around 2.000 rpm

Post by Alan 480 » Sun Jan 24, 2016 12:21 pm

Baxter wrote:I have a noise resonance at 2.000 rpm. Starts around 1.800 up to 2.300 more or less. It comes from the engine bay, and it doesn't change moving the engine when it's running so I discard the engine mounts. I think it is the exhaust but no leaks has been found.


It would be nice to solve it now, that the interior is very quiet. Not bad for a 20 years old car.

Any ideas?
turn up the stereo ? :D
Alan

480 ES 2litre 'Celebration' ? , C30 1.8ES, SS1

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Baxter
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Re: Resonance on exhaust around 2.000 rpm

Post by Baxter » Tue Jan 26, 2016 6:08 pm

well, yes, that's a good solution, specially if I listen to hard metal.
I know, perfection doesn't exist...but it's so nice when everything works as it best.
Hector.

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Re: Resonance on exhaust around 2.000 rpm

Post by Espada » Tue Jan 26, 2016 7:46 pm

Is the catalytic converter rattling?

Check out the videos on you tube to see if it sounds similar to what you have.

Regards

Simon

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Re: Resonance on exhaust around 2.000 rpm

Post by Captain Slow » Sat Jan 30, 2016 2:59 pm

I used to have a similar resonance, turned out to be a result one of the heat sheilds on the bulkhead being loose (pulled through rivet(s)).
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Baxter
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Re: Resonance on exhaust around 2.000 rpm

Post by Baxter » Sun Jan 31, 2016 6:31 pm

I made a video but it doesn't sound very good. I have to make it better.

https://youtu.be/CMj5GfzRQSE
I think it is not the catalytic, it is not metalic noise but a very bass noise.



When I show it to the mechanic he thought directly to a vibration produced by the silent blocks of the engine, but they were ok. Maybe the silent block of the underframe or as you said the heat shield.

I heard this very similar noise recently in a completly different car, a citroen C5 HDI MkII with 170.000 kms.
Hector.

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Re: Resonance on exhaust around 2.000 rpm

Post by Espada » Sun Jan 31, 2016 7:41 pm

Try you tube

https://www.youtube.com/watch?v=0BoT9C7rAm8

Using a jack gently as shown in the video could also help in diagnosis.

Worth a try.

Regards

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Baxter
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Re: Resonance on exhaust around 2.000 rpm

Post by Baxter » Sun Jan 31, 2016 8:35 pm

Espada wrote:Try you tube

https://www.youtube.com/watch?v=0BoT9C7rAm8

Using a jack gently as shown in the video could also help in diagnosis.

Worth a try.

Regards

That's it man. It's a noise quite similar to that.
Now it's time to look for the culprit silentblock
thanks
Hector.

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Re: Resonance on exhaust around 2.000 rpm

Post by Espada » Mon Feb 01, 2016 2:48 pm

I am glad it helped.

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teschio79
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Re: Resonance on exhaust around 2.000 rpm

Post by teschio79 » Sat Aug 17, 2019 7:40 pm

Hi! Solved?

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Baxter
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Re: Resonance on exhaust around 2.000 rpm

Post by Baxter » Thu Sep 10, 2020 7:37 pm

teschio79 wrote:
Sat Aug 17, 2019 7:40 pm
Hi! Solved?
I'm afraid not. The car is stored since then.
Hector.

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