URGENT! Grinding sound on cold start up

[Mattyclc]

Only happens when starting first time for the day, nothing on idle, but a grinding sound when moving for the first 20-30 meters, sounds like it's comming from passenger side but I could be wrong?

 

[NU13]

possible stone in the front brakes?

 

[Mattyclc]

possible stone in the front brakes?

It's only on a cold start up, if it was a stone it should make it all the time? Cheers for the input thought!

 

[VTSSLS1]

Where does it sound like it's coming from? Have somebody start it while you're looking in the engine bay, or underneath the car.

I had a similar issue with mine, turns out one of the cats (aftermarket high flow) is faulty, the core is loose in the casing, once it's hot it expands and can't be heard, but for the first few minutes of driving is very annoying. If you want to disprove this, when cold, if you thump the cats with your hand you should be able to hear the noise.

 

[Mattyclc]

Where does it sound like it's coming from? Have somebody start it while you're looking in the engine bay, or underneath the car.


I had a similar issue with mine, turns out one of the cats (aftermarket high flow) is faulty, the core is loose in the casing, once it's hot it expands and can't be heard, but for the first few minutes of driving is very annoying. If you want to disprove this, when cold, if you thump the cats with your hand you should be able to hear the noise.

Will definitely try this! From inside the car it sounds like it's comming from the front passenger side. But I still have stock cats so I'm not to sure

 

[Michael-08-VE]

Does it only happen when the engine is under load, or when coasting?
Might narrow down a few things

 

[Mattyclc]

Does it only happen when the engine is under load, or when coasting?
Might narrow down a few things

To be honest ive never tried just rolling in drive to Listen, but it still happens on the lighest of take offs

 

[aussieakito]

Timing chain rattle? lmao

 

[Michael-08-VE]

Also you could try side shifting the weight of the car by swerving left and right to see if it's a slightly worn bearing that only grinds till it heats up, probably isn't but I'm just as lost as you mate so I'd try everything. The cat converter sounds like the most plausible even if they are stock, sorry I can't help more.

 

[Silver6]

I would have thoughts the brakes or the bearing. As already mentioned best of getting someone to help take a look.

Good luck