Knocking sound after parking?

Cameron27 · 09-08-2017, 05:57 PM

,

thundercrakcer · 09-08-2017, 06:16 PM

It might be the exhaust contracting while cooling down? I had a co-worker who had situation with a weird sound after he parked. He showed it to me one day and my first thought was it sounded like it was coming from the muffler. He brought it to the dealer and had them replace the muffler. Next time you drive and get the operating temp up and then park wait by the car and try to localize the sound.

ShadySS · 09-08-2017, 08:50 PM

Quote:

Originally Posted by Cameron27

I have a 2017 v6. After I park, between 2-4 minutes later, there is a knocking sound that sounds like it's coming from the back of the car. It sounds like someone knocked on the rear, or rear-right of the car. Still startles me, sounds like it's coming from outside.

Is this something to worry about?

Nah it's just the exhaust cooling down after driving, it's like a metallic ping/knock sound

HCGxKaLiBeR · 09-08-2017, 09:35 PM

Same here. At first I thought someone is knocking my right window or door.

prob exhaust cooling down like everyone said or a fuel tank pressure thing.

L99BEN · 09-08-2017, 10:56 PM

Quote:

Originally Posted by HCGxKaLiBeR

Same here. At first I thought someone is knocking my right window or door.

prob exhaust cooling down like everyone said or a fuel tank pressure thing.

I have been wondering what this is as well.
Happens a few minutes later with the car turned OFF. Like someone lightly knocking on my car back window somewhere.

T Rex · 09-08-2017, 11:17 PM

Yeah it's the exhaust cooling down, no worries buddy.

nancygrl · 09-09-2017, 10:10 AM

Exhaust cooling down....No worries

Ohji-san · 09-11-2017, 03:27 AM

Glad to know that I wasn't hallucinating or my garage isn't haunted. It can be startling especially after a long day and drive home from work.

Nanas 2016 SS · 09-11-2017, 11:56 AM

Funny, I was sure it was something like this, but it still catches me off-guard if I am still sitting in my car.

redwhiteandblue · 09-13-2017, 10:54 PM

Quote:

Originally Posted by thundercrakcer

It might be the exhaust contracting while cooling down? I had a co-worker who had situation with a weird sound after he parked. He showed it to me one day and my first thought was it sounded like it was coming from the muffler. He brought it to the dealer and had them replace the muffler. Next time you drive and get the operating temp up and then park wait by the car and try to localize the sound.

My 2SS M6 makes loud clank noises near the front. Thinking it might be the rotors or radiator? Sounds like a hammer on an anvil kind of noise not the ticking of hot exhaust.

solo3811 · 10-18-2017, 12:21 PM

Quote:

Originally Posted by HCGxKaLiBeR

At first I thought someone is knocking my right window or door.

I have been experiencing this as well on mine as well. It's definitely not the exhaust and it can happen right after the engine is started or turned off.

solo3811 · 10-19-2017, 12:14 PM

So I went to the dealer to address the NPP rattle issue and also mentioned to them the knocking noise. Turns out its the EVAP solenoid.

09-08-2017, 05:57 PM	#1
Cameron27 Drives: 2015 2SS Join Date: Aug 2017 Location: Texas Posts: 349	Knocking sound after parking? , Last edited by Cameron27; 06-06-2019 at 11:30 PM.

09-08-2017, 06:16 PM	#2
thundercrakcer Drives: Summit White 2SS, M6 Join Date: Jul 2016 Location: Vancouver area Posts: 94	It might be the exhaust contracting while cooling down? I had a co-worker who had situation with a weird sound after he parked. He showed it to me one day and my first thought was it sounded like it was coming from the muffler. He brought it to the dealer and had them replace the muffler. Next time you drive and get the operating temp up and then park wait by the car and try to localize the sound. __________________

09-08-2017, 09:35 PM	#4
HCGxKaLiBeR Drives: 2018 Audi S4/2016 Carmaro 2SS Join Date: Apr 2016 Location: CT Posts: 127	Same here. At first I thought someone is knocking my right window or door. prob exhaust cooling down like everyone said or a fuel tank pressure thing. __________________ 2SS \| NPP \| NAV \| MRC \| Ground Effect \| Catch-Can \| K&N CAI \| DiabloSport AFM/HP tune

10-19-2017, 12:14 PM	#12
solo3811 Drives: Camaro Join Date: Oct 2017 Location: california Posts: 2	So I went to the dealer to address the NPP rattle issue and also mentioned to them the knocking noise. Turns out its the EVAP solenoid. Last edited by solo3811; 01-03-2023 at 07:48 AM.

09-08-2017, 11:17 PM	#6
T Rex Drives: '17 Hyper Blue RS, NPP, 6MT Join Date: May 2017 Location: Toronto Posts: 98	Yeah it's the exhaust cooling down, no worries buddy.

09-09-2017, 10:10 AM	#7
nancygrl 雪の玉 Drives: '22 Z71 RST Silverado Join Date: Feb 2011 Location: South Posts: 3,415	Exhaust cooling down....No worries

09-11-2017, 03:27 AM	#8
Ohji-san Drives: 2016 2LT RS V6 A8 BVM/Kala NPP Join Date: Aug 2016 Location: Torrance Posts: 55	Glad to know that I wasn't hallucinating or my garage isn't haunted. It can be startling especially after a long day and drive home from work.

09-11-2017, 11:56 AM	#9
Nanas 2016 SS Drives: 2016 1SS Blue Velvet Metallic Join Date: Sep 2016 Location: Sacramento, CA Posts: 8	Funny, I was sure it was something like this, but it still catches me off-guard if I am still sitting in my car.

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