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.

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

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 :lol:

OK
Find a shallow beach.

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


humfrz