Quote from: Bullet on July 04, 2008, 09:54:52 AM
Nick, the groaning noise you're hearing could just be your brake pump cycling.
it happened with my TSTE.

It isn't the PMIII cycling.  The pump turns on and off like it is supposed to.  This noise almost sounds like a groaning/whining noise a dying transmission makes..  It sounds like its coming from the turbo though.  When I take a screwdriver and put it on the exhaust housing of the turbo and put my ear on the screwdriver, I can kinda hear the noise.

Maybe your turbo's going bad already? Bad shaft? Remember noises tend to travel throughout the engine bay, expecially in the exhuast.

Quote from: grinders_18 on July 04, 2008, 03:22:01 PM
Maybe your turbo's going bad already? Bad shaft? Remember noises tend to travel throughout the engine bay, expecially in the exhuast.

I agree, you should make a quick video if at all possible.
I still think it could be a bad shaft. I've heard what one sounds like but I'd need to hear yours to confirm it.

Alright I took a few vids of it today, but my cell has kinda shitty sound quality. 

While doing this, I noticed something.. I kneeled down next to the drivers side front wheel and the noise was pretty loud here.  Sitting there, the noise almost sounded like an on and off grinding noise..  Kinda sounds like the turbo to me..  :icon_cry:

What do you guys think?

Another vid I took..

Not really sure what to tell you from those vids Nick. It might be best to save some money and take it to a GM shop so they can tell you. And until you figure it out, I highly recommend NOT driving it.

I'm really leaning toward bad turbo now.  I will be bringing it to the local GM dealer tomorrow and have a mechanic listen to it (so many turbodiesel trucks around here, they should know what a bad turbo sounds like).


I have a couple other issues with the car right now also.

1. If I give it WOT, the car will rev until it hits fuel cut (6,212 RPM) before it ever shifts.  I have to let off the gas for it to shift.  This happens in any gear, whether it is the 1-2 shift or the 2-3 shift.  I have adjusted the TV cable a few times now with no change.  I should also add that last year, the car had no problem shifting at WOT; last year I hooked up a scangauge and verified that it shifted at 5,200 RPM at WOT. 

2. Whenever I put the car into reverse, it SLAMS into reverse really hard.  With it doing this, it does NOT slam into drive.  It shifts into drive nicely.  I have made sure that all my vacuum lines are connected and there are no leaks. 

What do you guys think?

have you pulled the intake off to check the shaft play in the turbo?  does it spin freely, that being if you spin it with your hand it should go a few rotations before coming to a rest.  Oil in the intake?  these are some basic checks you can do to make sure it is ok.

Ken

Check your oil drain hose, make sure it's not kinked.

Check your tailpipes for any kind of "mud" inside them.

Like cobracmdr said, check the intercooler tubes for oil. Also, if the shaft spins freely, does it hit the sides of the turbine housing?

There is little shaft play in it when cold and no play when hot.  The shaft spins freely.  Ever since I got the car, there has always been a light coating of oil in the intake, not much, but a tiny bit of oil.  The car never has burnt any oil.  Oil drain hose is new and not kinked.  The car does not smoke at all.  The tailpipes are clean and dry. 

I noticed that if I push on the shaft, it will hit the wall slightly.  Other than that and the noise, it seems to work okay.  According to my boost gauge, the turbo spools up very quickly and hits 14 PSI easily. 

I'm going to see if I can get a mechanic to take a look at it today.

you got a new crossover on that thing?  I dunno nick but stick with it you will get through it!  You have made some good progress so far.

Ken

Yes, the car has a Jeff M. crossover I refinished and put on last year.

UPDATE

I just stopped by the local GM dealership and had a mechanic come out and take a look at it.

Bad news: he said that it sounds like my turbo bearings are on their way out.  He said "it will be fine to drive it, but it will probably go very soon, and when it does, the turbo will lock up and the car will smoke a lot."

It was funny when he was checking out my car, another mechanic walked up and checked out the car, he left for about 15 seconds and four other people came out and checked out the car. :laugh:  I had just polished and waxed and put paint sealant on the car yesterday, so she's pretty shiny right now.  So I got a lot of compliments from all the people at the dealer. :icon_lol:

         We love impressing people, especially the ones at the GM dealerships  :cheers:

So....  its time for a new turbo.  I would like something that will bolt up with little to no modification (unless its worth it ;) )  What is out there that you guys recommend?  A buddy of mine knows a guy that can get hands on almost any turbo inexpensively.  GTR2871? T3?  T3/T4?   I would definitely want to have a ball bearing turbo to go in there next, unless I can find another T25 for dirt cheap.  What do you think?  Any input is appreciated!