Metallic Scratching Noise On Start Up - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

N1rve · 07-31-2018, 11:53 AM

Hi Folks!

Recently I've been hearing a metallic scratching noise upon cold start up. It doesn't always occur so it's very difficult to record the noise. Sometimes it will happen once every 3 days, and sometimes it will happen once every 3 months.

It doesn't seem to relate to temperature either. To describe the noise, I would have to say it's a sound of crumpling paper really quickly or someone shaking a bag of rocks with metal shavings. The noise only lasts for a split second and goes away quickly.

The only exhaust mod I have is a Perrin 3 Inch exhaust. Everything else is stock.

I'm going to check the following this weekend:

1) Exhaust Shields
2) Mounting Points/Connection Points of exhaust
3) Check Starter (to see if it's grinding on the fly wheel but I highly doubt it).

Anything else to check? Could it actually be the baffles inside my Perrin muffler has gone/loose? Ideas on how to check that?

Car is a 2013 Scion FR-S 10 Series. It has push button start. Automatic Transmission. 56k Miles.

Tcoat · 07-31-2018, 12:33 PM

Heat shield.
I went through a big puddle that moved one of my heat shields and it made exactly that sort of noise under the same conditions as you stated.
Before I could hunt it down I went through another big puddle that apparently fixed it.
Find a big puddle!

humfrz · 07-31-2018, 03:51 PM

Quote:

Originally Posted by Tcoat

Heat shield.
I went through a big puddle that moved one of my heat shields and it made exactly that sort of noise under the same conditions as you stated.
Before I could hunt it down I went through another big puddle that apparently fixed it.
Find a big puddle!

Kind of hard in LA this time of year ..

humfrz

humfrz · 07-31-2018, 03:54 PM

Quote:

Originally Posted by N1rve

Hi Folks!

Recently I've been hearing a metallic scratching noise upon cold start up. It doesn't always occur so it's very difficult to record the noise. Sometimes it will happen once every 3 days, and sometimes it will happen once every 3 months.

It doesn't seem to relate to temperature either. To describe the noise, I would have to say it's a sound of crumpling paper really quickly or someone shaking a bag of rocks with metal shavings. The noise only lasts for a split second and goes away quickly.

The only exhaust mod I have is a Perrin 3 Inch exhaust. Everything else is stock.

I'm going to check the following this weekend:

1) Exhaust Shields
2) Mounting Points/Connection Points of exhaust
3) Check Starter (to see if it's grinding on the fly wheel but I highly doubt it).

Anything else to check? Could it actually be the baffles inside my Perrin muffler has gone/loose? Ideas on how to check that?

Car is a 2013 Scion FR-S 10 Series. It has push button start. Automatic Transmission. 56k Miles.

N1rve, you must be low on things to worry about -

humfrz

N1rve · 07-31-2018, 04:04 PM

Quote:

Originally Posted by humfrz

N1rve, you must be low on things to worry about -

humfrz

I just don't want my engine to blow up right after my powertrain warranty ends

Tcoat · 07-31-2018, 04:05 PM

Quote:

Originally Posted by humfrz

Kind of hard in LA this time of year ..

humfrz

OK
Find a shallow beach.

humfrz · 07-31-2018, 04:11 PM

Quote:

Originally Posted by N1rve

I just don't want my engine to blow up right after my powertrain warranty ends

OK, go with @Tcoats plan - find a percolation pond and hit it fast and hard...

humfrz

07-31-2018, 11:53 AM	#1
N1rve Senior Member Join Date: Oct 2013 Drives: 2019 BMW ///M4 Location: Los Angeles, CA Posts: 2,332 Thanks: 102 Thanked 1,167 Times in 714 Posts Mentioned: 28 Post(s) Tagged: 0 Thread(s)	Metallic Scratching Noise On Start Up Hi Folks! Recently I've been hearing a metallic scratching noise upon cold start up. It doesn't always occur so it's very difficult to record the noise. Sometimes it will happen once every 3 days, and sometimes it will happen once every 3 months. It doesn't seem to relate to temperature either. To describe the noise, I would have to say it's a sound of crumpling paper really quickly or someone shaking a bag of rocks with metal shavings. The noise only lasts for a split second and goes away quickly. The only exhaust mod I have is a Perrin 3 Inch exhaust. Everything else is stock. I'm going to check the following this weekend: 1) Exhaust Shields 2) Mounting Points/Connection Points of exhaust 3) Check Starter (to see if it's grinding on the fly wheel but I highly doubt it). Anything else to check? Could it actually be the baffles inside my Perrin muffler has gone/loose? Ideas on how to check that? Car is a 2013 Scion FR-S 10 Series. It has push button start. Automatic Transmission. 56k Miles. __________________ N1rve 2019 BMW ///M4 - Alpine White \| Sakhir Orange/Black Leather \| M-DCT \| Executive Package \| 19" Black 437M Wheels \| Carbon Fiber Trim \| Sunroof \| Active Blind Spot \| Heated Steering Wheel \| Adaptive M Suspension

07-31-2018, 12:33 PM	#2
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,845 Thanks: 61,656 Thanked 108,284 Times in 46,456 Posts Mentioned: 2495 Post(s) Tagged: 50 Thread(s)	Heat shield. I went through a big puddle that moved one of my heat shields and it made exactly that sort of noise under the same conditions as you stated. Before I could hunt it down I went through another big puddle that apparently fixed it. Find a big puddle! __________________ Racecar spelled backwards is Racecar, because Racecar.

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