No Boost on primary turbo.....
 

Hey guys,
I hooked up boost guage the other day.
I hold perfect vacuum.
But under WOT on primary turbo guage goes to 0 and holds,
then at exactly 4500 2nd turbo kicks in and holds 10 psi .
Car is stock with new stock engine. Any ideas? Or where to look?
Could it be something hooked up wrong? If so, point me in right direction. Also, on side note.i noticed there is a Blue wire "clip" connector on top of engine right above air pump that is not clipped into anything....just curious what this is also.

Please help guys...
Thanks

Sounds like soenthing is backwards. I didn't think the 2nd turbo kiched in unless the primary was at 7psi or higher?:confused:

I had the exact thing happen to me recently. When I reassembled my engine I accidently inverted the two hoses that are on the TCS #2, which is attached to the ACV on the LIM. I had 0-1psi of boost till 4500 and then it reached the WGA set 7psi and held to redline. I did notice however that there was a metallic vibrating sound near the turbos during this time, which I could not locate. After many attempts and disassembly I found that it was the TCA flap in the exhaust manifold that was vibrating, because it was not receiving the proper signal from the TCS #2, and that's how I found the problem. Btw the blue conector is not used on the 5speed cars. Sorry about the abbreviations, but that's how I remember them. Here's what they mean:
ACV= Air Control valve
LIM= Lower Intke manifold
TCA= Turbo Control Actuator
WGA= Wastegate Actuator
TCS= Turbo Control solenoid

Mach 2
Sounds exactly like my problem.....when 2nd turbo comes online i kinda hear a metal vibrating sound also. My holds 0-1 psi then perfect boost after 4500. So i looked at the vacuum hose schematic and i belive i see the 2 hoses you are referring to. Its right next to the only Air Controld Valve....and its called on the schematic (Solenoid Valve, Turbo Control)....and there exactly 2 hoses coming out of it. Is this it? Just making sure. And if so......whats teh easiet way to get to them. By picture it looks as though i will have to remove the upper intake manifold..( no biggie) but just making sure......and then they will be right there. Is this accurate?
Thanks for all the help......i will keep you guys updated when i find and fix the problem.

You have to remove the UIM to access the TCS#2. It's the only solenoid attached to the ACV(LIM) and is very visible cause it's much higher than the others. It has 2 hoses coming out of it which point towards the ground. Check those hoses for cracks or being inverted. You might also have a faulty solenoid which doesn't allow the pressure signal to go through, so you want to check that as well to see if it clicks and check the resistance as well. Good luck!

Mach 2....and rest...
Update on my problem....checked all hoses....all correct.
Checked the resistance ..all good
Pulled all intake crap off...and lower plastic piece to look at first turbo. With engine off checked play side to side..all good.....checked play front to back...absolutely none. Started car and at idel impeller started to spin...but then stopped , and kinda creeped around...like something holding it back. Give it gas and impeller spins...but once let off back down to creep. And at idle alone should be spinning at 4-5k......So all in the end it is my first turbo gone bad. 2nd one is fine but #one is gone. Once again thanks guys for all help and where to look. Was very thorough inspection ...and once i rebuild turbo..will definitely inspect all that every once in a while. Shoudl be generaly yearly mainetenence. Because long the path found a few hoses torn or very brittle.
Thanks

Stupid person here!
So I need one of you mechanically inclined folks to explain what he did above to determine that his turbo is bad. What did he have off to look at the turbo and how he was able to start the car with it apart.
Hey...I'm an art guy...trying to be a car guy.

Technonovice......
Well first off no need to check anything i did unless you are having problems. Boost guage is critical.
But for reference i am all stock. So i took out the airbox,
unhooked all the hoses running to it. ANd took off the black plastic pressure chamber and top ic pipe.
The bottom hose on the stock intake box runs at a 90 degree angle down goes right to the first turbo. So once you take off that big hose...there is a black plastic adapter type thing that is held there by 2 10 mm bolts.....one you remove that..the first turbo and impeller is right there. Can just reach hand right down in there to turn it etc. And as for starting car......car will start up fine with all this taken off or unhooked from one end. Since they are all just hoses that run into an airbox....really no different. So you can see first turbo spinning and etc. Only took me about 10 minutes to do all this .very easy to do. At idle turbo should be spinning 4-5k in revolutions. And when car is off...shaft should have no play front to back..and moderate play side to side. And if you kinda "flick" the impeller it should spin a good 10 revolutions or so. Hope this helped.

Yes that helps a pretender like me. I have the boost gauge now, but I need to install it. I have some stupid questions that I will have to post though.