My TGP has no boost and I can't figure out why. The turbo and wastegate assembly are brand new and in good working order, I replaced the boost control solenoid, I checked all connections. Does anybody have any ideas?

sounds like loose hose/clamp on hose from tubo to
intercooler, or intercooler to throttle body.
I have never heard of intercooler developing leak, but possible.

Yes a loose hose clamp or blown off hose usally to lower turbo to intercooler hose... or a plugged cat converter :drinking:  :drinking:

http://www.netavalanche.com/tgp/viewtopic.php?t=1346

Thanks for the input guys. I checked all the connections and everything looks OK. I am going to drop the cat next and then check the other things in Chris A's post.

when you say no boost do you mean you punch it and nothing at all?? cuz even with a loose hose you will still get some boost.  if its not boosting at all your waistegate may be stuck open or the control fromt he computer could be dumping immediatly due to a problem!  You said you have a new BCS its could be bad whether is new or not.  try this! remove you hose going to the bottom of the turbo that goes to the bcs and then see if you get boost.  If its not that then its the wg staying open.

By no boost I mean that when I punch it the guage on the dash never registers higher than 0. It moves, but is always in the negatives and there is very little power. To add a little bit of history here, before this happened I was having what seemed like the exact opposite problem and if I punched it the car would fly up to about 40mph and then loose all boost until I let off the gas.

#1 try this pull out your 02 sensor and clean it real good then put it back in and see what it does.  If  you have been running real rich due to the overkill stock settings (running rich) that thing should be about pitch black with carbon.  Mine was doing something similiar but not as bad as yours seems to be and that cleared it up big time.

plugged CAT.  If the wastegate is stuck open, then the engine will still have as much power as a N/A car.  If it seems doggier than that, plugged CAT.

If you ever find out whats wrong with your car...
Please if possible, LET ME KNOW...
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cause I am having tha exact same problem...
and I can't find out whats causing it...
thanx...

majestic did you try your 02 sensor? i am telling you it makes so much of a difference you won't believe!

Well guys, I found the problem!! :D  I know that you won't believe it  :wink: but it was a PLUGGED CAT!!!!!!  I dropped the exhaust and took it for a spin and all my boost was back!  Thanks for the help, the car has not run this good as long as I have owned it.

I'm gonna' try to clean tha o2 sensor tonight...
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but I really think its a plugged cat also...
cause my car pudders and it rumbles/budders when stopped at a light...
and it also pudders well tryin to get boost...
tha highest a god it was may +4 or 5...
and it smells like shit at tha light...
it smells like exuast crazy...
I fixxed my crossover pipe so it can't be that...
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I'm just gonna' wait till I get enough money and buy a new CAT...
by tha way, which CAT did you buy...
all I could find iz universal fit onez...

I cleaned my o2 sensor really good...
untill it waz shiny...
it made alittle difference...
it now goes to tha 5, somtimes 8...
I gonna' replace tha CAT on friday...
I found a direct fit for 80 dollorz...
so I'm gonna' go with that...
thanx for your help...

FYI - The factory boost guage is not very accurate at all.  I wouldn't base any assumptions on that guage... the cluster doesn't seem all that reliable.