My car has been making a noise that's driving me nuts! Anyways, it sounds like 2 metal rotating scratching each other. It comes from the engine bay. And it only happens after about 15 mins in stop and go traffic and then keep making that noise as long as I'm driving. I just recently replaced the clutch and flywheel and had my transmission rebuilt so I'm thinking it's something else. And this noise already happen before I had those 3 replaced. So.... help!

 

Bump. Help please.

 

Any engine mods and suspension mods?

 

I have megan test pipes, greddy exhaust, motordyne 16/4 (?) Spacer and cai. No suspension mod yet

 

Check accessory belt pulleys for bad bearings. If it takes a while to happen, maybe it's a radiator fan. Check anything that spins...lol

 

Well it seems to have something to do with the drivetrain. Cuz if I hold the clutch at the friction point for a bit longer than usual to get going from a stop and the clutch is grabbing, it'll make that noise for as long as I drive

 

And the noise goes with the engine speed as well. So the higher rpm, the louder it is

 

Try this...

While the noise is happening, pull over and put the car in neutral. Put the parking brake on, and release the clutch. Rev the engine. Does the noise go with engine speed? If so, you've ruled out the drive shaft and rear end. That would mean it's in either the transmission or engine.

If you still hear the noise when revving the engine in neutral at a stop, then my next step would be to get the car to start making the noise, then put it up on a lift. Get under the car and have an assistant do whatever it takes to replicate the sound. While you're replicating the sound, look/listen for where the sound is coming from. A stethoscope with a long probe or even a really long screwdriver can be used to pinpoint sounds. If using the screwdriver, just put the handle against your ear and touch the metal tip to the area you suspect. Be careful of moving parts!

EDIT: Look for any areas that are shinier than their surroundings, or missing paint/coatings. This is a good sign of rubbing.

 

Thank you so much for the thorough troubleshooting vivid racing. And answer to that is it does not do it while in neutral only when moving

 

Did you replace your TOB when you changed out the clutch and flywheel?

 

The TOB I'm not sure, I'm leaning towards that as well... but I thought the clutch kit should've come with one tho

 

Is a throw out bearing supposed to rotate or move at all?