just want to know how to fix this, i m boosting 7 psi, and all is runnig well, but sometimes when stop accelerating and put into second shift or no speed the car just turn off, just turn off. the car only turn off afeter putting it to high speed and then stoping , only turn off when stoping . sorry about my english i am from guatemela

 

Boost leak sounds like your problem. Check the turbo, intake pipe, j-pipe and make sure the nipples are capped. Also, make sure your clamps are tight
I had the same problem and I went to the local auto parts store and bought the variety of vacuum caps. Fixed it right up!

 

Not only that, but check your MAF. Other than that sounds like a boost leak.

 

ditch the worm clamps and go with t-bolt clamps, you'll never have to worry about boost leaks!

i also changed all my couplers to 4 ply silicone couplers.

 

so it is a boost leak, u hace some t-bolts on and somo normal, so change it all to t-bolts, the maf could it be?, so the leak is in the couplers or something alike?, when i disconnect the sensor it works fine

 

did you install the MAF backwards?

 

nop, the maf is in the right way, i think is the maf, could it be the vacuum line?

 

did the car throw out any service engine soon codes?

 

T bolt clamps are a good idea.. but 4ply couplers? (going for 60+psi?)
good couplers are a must (i still need to upgrade a few of mine)
but no point in the overkill on the couplers, unless price is about the same.

stalling could also be a fueling issue. hate to say it, but 4+ people saying boost leak, and not one saying fuel/tune? i know my car will flood out every once and while when i downshift, but i normally catch it and raise the revs a little.

(sorry i don't know your car better, but is this a new turbo install? or an old one that has been tuned and working fine for a while?)
-if it is tuned, and you havent been having any problems pervious to this, just ignore me.

 

A boost leak would be more possible. It would have to be a significant leak for it to stall out the car. However, if the fuel on deceleration was way to much, that could also stall out the car since it will give the same effects.

You can build a simple pressure tester for cheap and test the system for the leak. If none is found, tuning is the next place to look.

This is all taking into account you are not using a vta bov that is causing the problem

 

ok, im still not using a bov, could it be that?, i think maybe is the fuel, it oly make it in 2nd shift yesterday i try it in 3rd and all was ok. if accelerating the car more could help?, now the idle acceleration is under 1. also it is not throwing check engine light.

 

Wait you don't have a bov at all?

 

nop, i still waiting for it, it have not arrive yet.

 

PLEAST STOP DRIVING YOUR CAR!!! YOu are shocking the **** out of your turbo and will blow it, if you havent already. You HAVE TO HAVE a valve on the car

 

Just noticed you are the SAME guy that completely screwed up his oil/water lines. You really need to find someone else to do the work on your car