My car just making a slight rattle sound, in second and third gear, at around 10 lbs. of boost, when accelerating and sometimes on the decel. then goes away. I hold boost just fine. any ideas what this could be? I can't tell if it's the drivetrain or not. It seems to happen at or around half to full throttle. Car is basically stock: exaust, drop in, flash, bov

Any help is appreciated...

 

oh and the noise just started after I swapped all of my fluids I dont know if that would cause it though.

 

a bolt in ur head?


























































j/k
seriously it can be tonnes and tonnes of things..... Youll need to decipher based upon trial and error/.

 

where would you start? turbo? wastegate? Im hoping not a tranny issue all of the sudden

 

Did you take off and put on back the undertray, if so is it secure?

 

We took off a small section on the undertray when we flushed the coolant... I will check that... this is more of a slight metallic grind / vibration almost feels like it's under my feet but cant tell.

 

Is it rpm dependent? when you press the clutch in does it stop?

 

^ yes it seems to be. and pushing in the clutch does make it go away...

 

...

 

t-case. your fuct

 

Balance shaft? Does it start around 4k rpm?

 

^ not around 4k rpm lower than that at like 3k 3.5k rpm. It's pissing me off. The noise happens for a second then goes away. just a very slight rubbing or grinding noise. really only happens in 2nd and 3rd gears. damnit

 

not sure if its your problem but i had the same problem and sound as you describe. after trial and error i found it was with my mechanical o2 fix (2 antifoulers) and would cause the o2 sensor to rub on the undercarriage.

 

Glad everyone ignored this...

Is it a rattle? A rub or a grinding noise? I'm so confused and lost.

Exhaust is the first place I'd check, then check the suspension.

 

I dont think its his TC. My TC is messed up, and it happens in every gear and never goes away.