Cold start mystery noise, help!

Hi Everyone,

 

I've attached a video of the noise my car is making on very cold starts.

 

I've got the car in gear, braking and accelerating to put on some load. The noise is very obvious once I've eased off the throttle.

 

https://youtu.be/SZd3HCtzDq8

 

The noise disappears after 5 minutes making it difficult to take to my mechanic to inspect.

 

To me it sounds like a combination of rattling heat shields and some whine.

 

I've inspected my exhaust system, banged around with a small rubber mallet and no obvious loose connections. I retightened my heat shields anyway.

 

My mechanic has inspected suspension components and all bushings etc are in good condition with no play.

 

I've also inspected my rear motor mount (i think also referred to as a transmission mount) with a pry bar, no crazy play.

 

I am so stumped with this and I don't really want to start throwing money down the drain.

 

Any feedback/suggestions will be super appreciated.

 

https://youtu.be/SZd3HCtzDq8

Whine is the power steering pump.

 

clicking is the injectors.

 

The ring...I'll have to think about that. sounds like the noise the fly wheel makes when you tap it with a hammer...?

Edited July 9, 2020 by Max Capacity

Thanks man,

 

What do you mean by the ring though?

 

I have noticed some oil seeping from the feed line going into the PS pump. I think first bet will be replacing that famous o ring.

As you let off the throttle and the engine is reving down, I can hear it.

Thanks again man..

 

Will grab that o-ring and a small hose clamp to make sure no more air is seeping into the PS System.

 

Damn, fitted the new o rings from the dealership. Bled the system best I could. Still made that awful grinding/whining sound at cold start up on Sunday morning.

 

Any other ideas I can look into?

 

Before replacing the oring my pump was definitely leaking oil from the low pressure side. The oil leak is gone, but the noise is not.

 

So frustrating

I don't hear anything abnormal in that video.. Is the grinding in the video? Does it only occur immediately after being started, or does it last longer?

When I let go off a throttle, you'll hear the grind/whining sound.

 

Only happens when cold. Car runs well when warmed up

Any other possibilities guys?

Pull off the belts and see if it goes away. If it does first put back the a/c belt. If still gone put back the alt/ps belt. If its back you know its one of the two. My idler pulley was my noise maker back when I bought the car in 2017. This is how I found it.