Intermittent Boost

[spederman]

I am so sick and tired of my car, that i am honestly thinking of just selling it. It hasnt run right since i had my setup installed. Every week its something new.

here is my new problem. I only get boost intermittently. Sometimes i punch it and nothing, just stock engine power, and nothing reads on the boost guage, the exhaust sounds quiet. Then drive a couple miles down the road and punch it and full boost and full power and it sounds like a freaking nascar. WTF is with that? How could that possibly be happening? I checked to make sure all the couplers for the intercooler were on tight and they seem to be, so what could be going on. Just got back from driving it right now and same thing, half the time i have boost, half the time nothing at all. One of the times i went WOT, it didnt build any boost until 5000rpms and then only 5lbs. Normally it hits at 3k and will hit 10psi at redline. Any suggestions?

 

[SaleenGT2001]

sounds like your BPV is stuck open

 

[the98stang]

major boost leak?

 

[DaNd4Speed]

sounds like your BPV is stuck open

That's what I was thinking. Check your vaccum line running to the BPV. Make sure you have no leaks.

 

[smokin00GT]

Your bypass could be broken. I got a cheap looking bosch with my kit. Last week on the dyno my car would not go over 13# with a 2.9" pulley that's supposed to make 16-20#. I am going to get a race BPV, maybe you need one too?

 

[Gearbanger 101]

I'm having the same problem with my car. It only usually does it in cooler weather, which also leads me to believe that it's a sticky bypass valve. One time it will whack 9 1/2 psi then next cold start I'm barely able to get 4psi out ot if. The problem I face, is that I have to remove my entire upper manifold in order to get to it.

 

[spederman]

I have the vortech mini race bypass. Sucks if its the problem, i spent that much on it so i could avoid this problem with the cheapy bpv's. So is there anyway to test them to know for sure if its bad, or do i basically just have to get a new one and check that way. I hope they have a warranty since i just got it 6 mos ago.