[s-cars] Vacuum leak

Cory Pio cpio921 at gmail.com
Fri Dec 11 23:13:07 PST 2009 

I appreciate it dude

Sent from my iPhone

On Dec 12, 2009, at 1:26 AM, djdawson2 at aol.com wrote:

> With all due respect, I don't think you understand the fundamentals  
> of how a turbo system works at all.  The wastegate doesn't open  
> under any circumstances until the pressure within the exhaust  
> manifold reaches a certain point, and/or pressure is applied via the  
> n75 to the wastegate.  As such, there is no possibility that your  
> wastegate is "hesitating to shut."
>
> The BPV, on the other hand, is always open when there is a vacuum  
> present in the intake manifold.  It closes as soon as you open the  
> throttle off idle.  This can be a point of failure for achieving  
> boost, and very easy to test.
>
> Replacing your ecu, your ignition coils, getting rid of your MAF,  
> blah blah blah with "shiny new parts" isn't going to do squat... you  
> need to figure out what's wrong with your system as-is, and fix it.   
> I'd suggest you try and learn a little bit before you start throwing  
> parts at a problem you don't understand.
>
>
> -----Original Message-----
> From: Cory Pio <cpio921 at gmail.com>
> To: Robert Myers <bob at chips-ur-s.com>
> Cc: s-car-list at audifans.com <s-car-list at audifans.com>
> Sent: Fri, Dec 11, 2009 11:04 pm
> Subject: Re: [s-cars] Vacuum leak
>
> I guess I'm asking is it possible my wastegate or bpv are hesitating
>
> to shut quickly on off throttle because of a vacuum leak?
>
>
>
> Sent from my iPhone
>
>
>
> On Dec 12, 2009, at 12:57 AM, Robert Myers <bob at chips-ur-s.com> wrote:
>
>
>
> > *This message was transferred with a trial version of CommuniGate(r)
>
> > Pro*
>
> >
>
> >
>
> > Cory,
>
> >
>
> > If you hear air escaping --- YOU HAVE A LEAK!  Period.  You simply
>
> > must find it and fix it or the car won't run worth crap until you
>
> > do.  Yeah, finding a leak isn't glamorous but you simply have to do
>
> > it or you're just pissing into the wind.
>
> >
>
> > Bob
>
> >
>
> >
>
> >
>
> >
>
> > At 12:49 AM 12/12/2009, Cory Pio wrote:
>
> >> *This message was transferred with a trial version of CommuniGate
>
> >> (r) Pro*
>
> >> Yeah I'm thinking it could be my retarded intake setup Inherited  
> from
>
> >> the PO. I'm getting a fuel trim code adaptation limit exceded. I
>
> >> already replaced the plugs and fuel filter. I have HO coils  
> coming in
>
> >> from 034. I'm thinking of just switching to a 1.8 bar spring
>
> >> getting a
>
> >> bpv and going with vems ecu to get rid of the maf which seems to be
>
> >> tied into my n75 valve. Hopefully going big turbo and redoing  
> alot of
>
> >> stuff this problem will go away. Just tedious annoying things like
>
> >> vacuum leaks piss me off when troubleshooting in the freezing  
> cold. I
>
> >> rather be bolting in some shinny new parts. The wastegate or bpv is
>
> >> de
>
> >> staying open when I give little throttle.
>
> >>
>
> >> Or for a better example when I get into boost and let off throttle
>
> >> boost goes bye. Well when I get back into it at higher rpm it  
> hardly
>
> >> comes out of vacuum and I can still here air escaping. Hmmmmmm
>
> >>
>
> >> Sent from my iPhone
>
> >>
>
> >> On Dec 11, 2009, at 9:57 PM, Robert Myers <bob at chips-ur-s.com>  
> wrote:
>
> >>
>
> >>> *This message was transferred with a trial version of CommuniGate 
> (r)
>
> >>> Pro*
>
> >>>
>
> >>> The "vacuum pump" under the rear seat operates the pneumatic  
> locking
>
> >>> system and has nothing to do with your boost or lack thereof.
>
> >>>
>
> >>> If I read your complaint correctly I think you are complaining  
> that
>
> >>> your engine is showing turbo lag.  This is 100% normal for a
>
> >>> turbocharged engine,  If boost is not coming on as early as it  
> used
>
> >>> to and/or it isn't getting as high as it used to then you may well
>
> >>> have a leak in the induction system.  There are several cute  
> tricks
>
> >>> to locate such leaks.  Some work in one case but not in others.
>
> >>>
>
> >>> If you have a leak while idling (the leak is open at low  
> pressures)
>
> >>> try spraying ether based starter fluid over the plumbing while the
>
> >>> engine is idling.  If ether hits the leak some of it will be drawn
>
> >>> into the system and the engine rpms will pick up.  This can help
>
> >>> find such a leak.
>
> >>>
>
> >>> You can construct a simple gadget from a 4-6" piece of 3" PVC  
> pipe,
>
> >>> a 3" cap, some PVC glue, and a tire valve.  Use this gadget and  
> some
>
> >>> shop air to pressurize your induction system to perhaps 7-10 psig.
>
> >>> Listen for a hiss sound from the plumbing and track it down.
>
> >>>
>
> >>> Of course if you have a BIG leak you can't get enough air in the
>
> >>> system to inflate it even a little.  Start looking for likely
>
> >>> leaks.  The very first place to look is the Michelin Man hose  
> (from
>
> >>> the crossover pipe to the intercooler inlet) and closely inspect  
> it
>
> >>> for leaks - take it out and flex/bend/twist/etc to expose and
>
> >>> potential leak. if it isn't there then do the same with other
>
> >>> portions of the system.
>
> >>>
>
> >>> Do not ignore the small tubing connected to the water trap.   
> Earlier
>
> >>> s-cars look for the trap high on the engine side of the firewall
>
> >>> near the rear of the engine.  It is a little larger than a 35mm  
> film
>
> >>> cannister.  Later models have the trap located under the carpet  
> near
>
> >>> the ECU.  Trace the MAP hose back from the ECU to find the trap.
>
> >>>
>
> >>> Bob
>
> >>>
>
> >>>
>
> >>> At 09:36 PM 12/11/2009, you wrote:
>
> >>>> *This message was transferred with a trial version of CommuniGate
>
> >>>> (r) Pro*
>
> >>>> Alright guys
>
> >>>>
>
> >>>> Im thinking a vacuum leak might be giving me wastegate/ bpv
>
> >>>> problems. My car pulls about -15 hg in.  When fully warmed up. It
>
> >>>> used
>
> >>>> to do 20. So my question is my car locking system and the vacuum
>
> >>>> pump
>
> >>>> under my rear seat a good place to start looking for leaks?
>
> >>>>
>
> >>>> My symptoms are my car doesn't go into boost right away . The
>
> >>>> wastegate or bpv seems to be staying open unless you really get  
> on
>
> >>>> it.
>
> >>>> Any help would be much appreciated.
>
> >>>>
>
> >>>> Thank you
>
> >>>> Cory pio
>
> >>>> _______________________________________________
>
> >>>> S-CAR-List mailing list
>
> >>>> http://audifans.com/mailman/listinfo/s-car-list
>
> >>>> http://www.audifans.com/kb/List_information
>
> >
>
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