weird metallic sound PSE 997.1 S
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5th Gear
Joined: Aug 2022
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weird metallic sound PSE 997.1 S
Hello,
I bought a 997.1 S a few days ago, which is equipped with the PSE.
Somehow the exhaust is very noisy, in particular at low speed: between 1000 and 2000 rpm it produces some sort of metallic sound, in sync with the engine revs. It sounds like some metal part are vibrating somewhere (and probably beyond it still makes the noise, but it is then covered by other sounds)
I made a video of it:
Opening or closing the valves doesn't change anything.
Does it sound normal to you or not? If it's not the "expected" sound, any idea where it could be coming from?
Thanks a lot!
I bought a 997.1 S a few days ago, which is equipped with the PSE.
Somehow the exhaust is very noisy, in particular at low speed: between 1000 and 2000 rpm it produces some sort of metallic sound, in sync with the engine revs. It sounds like some metal part are vibrating somewhere (and probably beyond it still makes the noise, but it is then covered by other sounds)
I made a video of it:
Opening or closing the valves doesn't change anything.
Does it sound normal to you or not? If it's not the "expected" sound, any idea where it could be coming from?
Thanks a lot!
Pro
Joined: Apr 2019
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Thread Starter
5th Gear
Joined: Aug 2022
Posts: 5
Likes: 0
Hi 8x57IRS,
Thanks for your reply!
I didn't go through the PPI per se (I mostly visit French forums), however I had a similar checklist. I also got it checked by a Porsche specialist who performed a PIWI test, checked the car / engine was in great condition.
- The car has 54,000km (~35,000 miles)
- The PIWI test results make sense and are clean (983 hours only zones 1 & 2). No signs of bore scoring (but he didn't inspect inside of the cylinders)
- I talked to Porsche (the first owner did the maintenance at Porsche from 2005 to 2009 (drove only 7,000 miles in 4 years). They mentioned that they had worked on the cooling system / pump, that it was part of a recall.
- Then the second owner got the maintenance done outside of the Porsche network. I managed to talk to the mechanic who dealt with it, he says the mileage are genuine, and that his client never had any problem with the car
Anyway, coming back to the main problem here: I noticed that this metallic vibration is amplified between 1800 and 2500 rpm. Maybe it still exists beyond it, but it's simply covered by the intake or exhaust noises...
I disconnected completely the valve control of the PSE, and now I hear it way less. It probably has to do with 1/ the loud noise of the PSE covers any other noise and 2/ there is probably less back-pressure with the valves opened, therefore it amplifies less the vibration of other parts.
I was thinking that some heat shield may be loose, however I can't find which one (and from underneath the car, what I can touch seems firmly attached). Or could it be something within the PSE vibrating? It seems to be only on the driver side (even though I may be biased, because I'm sitting on that side)
What do you think?
Last edited by rey.fasc; Aug 16, 2022 at 05:36 AM.
Pro
Joined: Apr 2019
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Thread Starter
5th Gear
Joined: Aug 2022
Posts: 5
Likes: 0
I can already hear this at idle. These engines often exhibit this nailing when the piston slap is increasing. However, it is not yet very pronounced here and I do not want to spread fear! I would try with an engine stethoscope to verify or discard this, starting right at cylinder 6. From below on a lift, this is easily done in 5min and i strongly recommend to perform that. I do not think it is exhaust related. Keep us updated.
So you are basically saying my exhaust sounds normal, and the left exhaust simply amplifies a little bit the ticking noise that we hear coming from the engine, if I understand correctly?
Actually looking at a handful of videos, my exhaust indeed sounds pretty similar to these (you'll notice the first one ticks much more than mine!)
The ticking noise is now getting me a little bit worried now that I know more about the statistics of scored cylinders (before buying it, I didn't think it could affect young engines, and I was coming from modern BMW and Porsche engines, which tick A LOT MORE so I barely paid attention to it).
It ticks on both banks, probably a little bit more on the right hand side, no matter whether the car is warm or cold.
On the positive side:
- I don't have any symptoms of burning oil, smoke at startup, nor more soot on one side that the other. I don't consume any oil at all.
- I listened to recordings of scored cylinders, it sounds like my ticking is of a much higher frequency than the one of a scored cylinder don't you think? And many 997.1 seem to tick, looking at videos (but not all of them I agree!)
- Then even if I'm doomed, I won't drive the car too much anyhow. So another couple of years to go before a engine rebuilt I guess, giving me some time to put cash aside..
Since I have a slight idle problem which was not fixed by cleaning the throttle body and changing the MAF (the problem is awkward - sometimes, when the A/C is off, when I stopping at a traffic light for example, the car idle drops to 500rpm for 0.1 sec before going back to 700rpm - while when A/C is on, I don't have any problem at all, the idle settles perfectly at 800 rpm), I was planning to change the spark plugs. Probably a good opportunity to look into the condition of the cylinders..
Pro
Joined: Apr 2019
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The ticking noise is now getting me a little bit worried now that I know more about the statistics of scored cylinders (before buying it, I didn't think it could affect young engines, and I was coming from modern BMW and Porsche engines, which tick A LOT MORE so I barely paid attention to it).
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Racer
Joined: Jan 2012
Posts: 494
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If you are saying that activating the sport exhaust doesn't change the exhaust sound, maybe one of the valves in the exhaust
is bad and that is causing the metallic rattle that you're hearing. that might be easy to diagnose if you have someone rev the engine
while you listen to the side mufflers. An engine stethoscope would be ideal for this but you be able to place a long-handled screwdriver
by the muffler valves and then putting your ear to the handle end of the screwdriver.
Hopefully it's nothing to worry about.
is bad and that is causing the metallic rattle that you're hearing. that might be easy to diagnose if you have someone rev the engine
while you listen to the side mufflers. An engine stethoscope would be ideal for this but you be able to place a long-handled screwdriver
by the muffler valves and then putting your ear to the handle end of the screwdriver.
Hopefully it's nothing to worry about.
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