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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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08-21-2016, 06:50 PM | #1 |
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knocking sound
Hi Everyone,
After i have driven for about 7-8 miles, when I shut down the car I hear knocking sounds from the engine. The knocking sound continues for a couple of minutes. This is the first car I have owned and I don't know if this is something I need to be worried about. I use chevron fuel with 92 octane rating if that helps. I am adding a sound clip of the knocking sound. Any tips will be much appreciated. sound clip Thanks, WingRider. |
08-21-2016, 06:58 PM | #2 |
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It sounds like the heat shields cooling off on the exhaust. I wouldn't worry about it, its normal.....
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08-21-2016, 07:16 PM | #3 |
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Thank you very much for the quick reply!
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The Following User Says Thank You to wingrider For This Useful Post: | FRS Justin (08-21-2016) |
08-21-2016, 07:24 PM | #4 |
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I have never heard heat shields THAT loud. There's something else going on. You need to crawl around and find out where the noise is coming from. Is it from the engine, underneath or somewhere else?
Heat shields contracting is normal and every car does it, but it's not very loud and every car does it. |
08-21-2016, 07:42 PM | #5 | |
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08-21-2016, 07:42 PM | #6 |
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Hello @wingrider and welcome to the sounds of the FR-S/BRZ.......
Yep, I reckon @FRS Justin has it diagnosed proper. humfrz |
The Following User Says Thank You to humfrz For This Useful Post: | FRS Justin (08-21-2016) |
08-21-2016, 07:47 PM | #7 | |
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08-21-2016, 07:52 PM | #8 |
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I used the sound recorder android app. Don't know if it turns the the gain up. I feel that it comes from the engine. Really noob question: you said its the heat shields cooling off the exhaust. Does it mean it will be louder at the back of the car at the exhaust? I can verify that.
The car does not overheat and runs beautifully. Its a joy to drive |
08-21-2016, 07:58 PM | #9 | ||
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The Following User Says Thank You to guybo For This Useful Post: | humfrz (08-21-2016) |
08-21-2016, 09:38 PM | #10 | |
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Quote:
https://www.google.com/search?q=frs+...+shields&imgrc=_ they surround the exhaust pipe to dissipate the heat. It should actually be quieter towards the back because the heat has mostly dissipated...
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08-21-2016, 10:16 PM | #11 |
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I would bet money that is drops from the AC line. Water hitting the exhaust. There is a small black tube that drains most of the water coming down under the passenger side floor board. maybe that is clogged. I have never heard my brz make this noise but i have absolutely heard it on many other vehicles. Sounds just like Water from the AC dripping on the exhaust.
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08-21-2016, 11:22 PM | #12 |
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It sounds loud .. but is it loud or just such recording loudness level? When i park mine, yes it ticks/knocks, when cooling down, but not that easy to gauge how that "not that loud" on mine is vs this recording, by trying to scale it to other ambient sounds recorded.
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The Following User Says Thank You to churchx For This Useful Post: | FRS Justin (08-22-2016) |
08-22-2016, 12:35 AM | #13 |
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After a second listen, it sounds like hail on the tin roof of an empty chicken coop.
If the OP was from Georgia ....... I would figure that's what it was ...... OK, I deserved that. humfrz |
The Following User Says Thank You to humfrz For This Useful Post: | FRS Justin (08-22-2016) |
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