2G Noise at 2700rpms and above

[4t9ers]

Hey guys.

I’m hoping someone here can help me pin down a noise.

Edit; new links - WITH SOUND!!

https://imgur.com/gallery/qxHhPZU

https://imgur.com/gallery/fsJfaJ3

It comes on at about 2700rpms and stays till redline.

Motor is a 6Bolt. Has made this sound since the swap. Things I can tell you it isn’t;

Alternator- has been rebuilt with a new belt.

Power steering - belt actually shredded and noise persisted.

Turbo - 2 different turbos have been put on.

Accerssory pulley- 2-3 have been put on/swapped.

Timing belt/water pump*** - this were changed. But by a non DSM mechanic (he was a general mech) so maybe he didn’t do something right? The sound was before he changed Timing belt and after.

Any help pointing me in any direction would be great.

Thanks in advance.

 

[motomattx]

Linky no worky.

 

[4t9ers]

Updated links.

https://imgur.com/gallery/qxHhPZU

https://imgur.com/gallery/fsJfaJ3

 

[4t9ers]

Linky no worky.

Can you try it now?

 

[motomattx]

That sounds vibration related, maybe your rear balance shaft is out of sync, if your mechanic isnt up to speed on the 4g63 balance shaft phase requirements then it could be 180 degrees out on the back shaft very easily.

 

[4t9ers]

That sounds vibration related, maybe your rear balance shaft is out of sync, if your mechanic isnt up to speed on the 4g63 balance shaft phase requirements then it could be 180 degrees out on the back shaft very easily.

Interesting. I do know the guy who did the swap. I’ll have to double check with him.

Edit; I’m pretty sure the balance shafts were removed durning the 6 bolt swap.

 

[motomattx]

If they were removed then it could just be a vibration on something that is loose, converter heat shield or the like.

 

[Auto RS T]

Remove the accessory belts and start the vehicle without them on. This will narrow the noise down in the front of the engine area where you are filming.

If the noise persists inspect the timing pulleys and components for rubbing or interference.

 

[DSMPT]

Hard to tell with the videos, but maybe from a/c compressor shaft bearing, if you still have it.

 

[ThunderChild]

That sounds like a/c pulley freewheel bearing is toast causing the pulley hit the clutch mechanism. Past that we'd need more pics as it sounds like it resonates from the rear of the engine bay.

Also since you're p/s belt shredded, you might want to check alignment, under load/rpm it may be stressing the pump shaft and contributing to the noise.

 

[brian9397gsx]

Take all the belts off one at a time and check. It almost sounds like something rubbing on the front cover. Hard to say but definitely sounds like something in the accessory drive. I've had harmonic pulleys make noises like that when they start slipping.

 

[1990TSIAWDTALON]

That sounds like a/c pulley freewheel bearing is toast causing the pulley hit the clutch mechanism. Past that we'd need more pics as it sounds like it resonates from the rear of the engine bay.

Also since you're p/s belt shredded, you might want to check alignment, under load/rpm it may be stressing the pump shaft and contributing to the noise.

And make sure that the PS pulley and Alt pulley are facing the correct direction, it can make a belt shred pretty quick if they are accidentally backwards.

 

[4t9ers]

That sounds like a/c pulley freewheel bearing is toast causing the pulley hit the clutch mechanism. Past that we'd need more pics as it sounds like it resonates from the rear of the engine bay.

Also since you're p/s belt shredded, you might want to check alignment, under load/rpm it may be stressing the pump shaft and contributing to the noise.

I am running with the A/C still (it can get hot here in So Cal), so I will definitely look into that. As far as I can tell, the A/C unit is still the original one.

And based on your thoughts, and the thoughts of other replies in the thread, that’s where I’ll start my search.

Thanks everyone. I’ll update with a post when I get after it.

 

[4t9ers]

update(8/2020);

I got a comment on my youtube channel asking if I ever figured out this sound.

Sadly, No. I disconnected the A/C belt and the noise still persisted.

 

[AWD-Tony]

2 years to remove the ac belt. Think that’s a record . Remove the ps and alternator belts and see if it’s still there. If it’s still there, time to pull the timing cover.

 

[95FullSend99]

Honest if you have been driving it this whole 2 years and nothing has blown up and you have that sound, then you are in better shoes than most of us and I would cut my losses and accept the sound as normal.

 

[4t9ers]

@TK

I know. Time flies man.

@FullSend

ya. It had been making the noise for a couple years before I even made the original post. At this point I have accepted that it’ll be with me until the end. Lol

 

[95FullSend99]

@TK

I know. Time flies man.

@FullSend

ya. It had been making the noise for a couple years before I even made the original post. At this point I have accepted that it’ll be with me until the end. Lol

I have had this same belt squeak at first start for 6 years now. Still embarrassing but have replaced everything attached multiple times and it has never gone away. Me and my neighbors live with it now

 

[AWD-Tony]

Good point @95FullSend99. Check the brackets that bolts to the head. It has one on each side of the cams. It’s there to bolt the timing cover and there are two bolts per bracket.