• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

Running on full boost!!! AAAHH!!!

U

USMarine430

New member
Ok folks. . . have a real dillema. . . When I start the car the boost bypass immediately goes into full boost - its not flopping around like it should be:(. I just replaced the solenoid within the past few months, and to test it I checked the ground for continuity and it clicked - and I replaced the perfectly good new one with the good used one. Same thing. It keeps going into full boost and it is stalling out my wifes car and she now hates the world and the car :th_skull:.

All of the vacuum lines are plugged in, and I cant see where there would be an issue unless its internal. . . HELP!!!

:th_nervous:
(2001 3.8L GTP Topswap)
 


Have you tried replacing the valve itself? Maybe the diaphragm is torn. Does it move at all when you start the car or rev the engine?

Sent from my Droid
 
dear heavens thanks for responding. Yes the valve goes from completely relaxed (all the way down), and immediately flops all the way to full boost when it starts and will not bob up and down like its supposed to.

I am freaking out maaaan. . . .super troopers style
 
Flopped up is open, flopped down is closed. It should flop up when ypu start the car and flop down when you rev it good. It operates of vacuum.

Sent from my Droid
 
i thought it was boost on demand.. . its supposed to flop up, which it does. . . but this flops all the way up on full boost. ever since I have had the car it would bob up and down and as you accelerate it goes to full boost. this immediately goes to full boost and subsequently stalls out at start up.
 


so it is supposed to be full boost all the time?
Its supposed to go from its resting position to full boost with no fluctuation afterward? That is what its doing - its on full bypass
 


This is how it should work.

http://www.youtube.com/watch?nomobile=1&v=EA7J_qIurAU

Sent from my Droid
 
Last edited:
I doubt the bypass valve is causing ypur problem. It should run fine even if you are always running full boost.

Sent from my Droid
 
dsmuts said:
does it run if you hold it where it should be?
Click to expand...

No sir, it does not. It starts, the bypass immediately goes to full boost, and then it stalls out.
I removed the bypass and I don't see anything wrong on the exterior - the diaphragm looks fine . . .
 


matt5112 said:
How are you making boost at idle even with the BBV closed?

Also whats a GTP top swap mean?
Click to expand...

The block is a stock 3.8 naturally aspirated. the top (heads, intake,) were removed and a supercharger, underdrive pulley, GTP heads and injectors were added. a 2007 transmission and ECM were added too.

SO, yeah to answer your question - I dont know - that was essentially my question and why I am here trying to figure out situation because I dont know.
 
a 2007 ECM is untunable and wouldn't work with your combination.

It wouldn't know what to do with your injectors, have the wrong cal for your MAF, would want to see a TAC instead of an IAC/TPS.

It'd either command too much timing and run too lean OR transmission wouldnt know when to shift.

So, are you sure?
 
You must log in or register to reply here.
Back
Top