[urq] RE : Vacuum limiter

[Buchholz, Steven]

... it has nothing whatsoever to do with fueling ... other than the fact
that there's a whole bunch of rubber plumbing of metered air in that
area ... and any leak will screw up the mixture.  The decal valve is
just intended to allow air to bypass the throttle plate to prevent the
manifold pressure from going too far negative.  If the manifold vacuum
goes too high you can get increased oxides of Nitrogen in the exhaust.  

It is only installed on the WX because the WR does not have any of the
emission controls of the WX.  

Steve B
San Jose, CA (USA)
> 
> Looks like it, indeed.
> 
> But you didn't answer my question (or I don't understand your
answer...):
> what's its role, or effect, on the engine fueling ?
> Is it related to the emission's control ?
> And why is it installed ONLY on the WX ?
> 
> I am asking all this because I must work on Eric's car fueling, and I
want
> to understand every little bit of the CIS.
> 
> TIA,
> Louis-Alain
> 
> 
> > -----Message d'origine-----
> 
> > ... pretty sure this is the same valve labeled "decel valve" on page
13 of
> > the IST Maintenance and Adjustments manual.  I'm pretty sure that it
> > allows air to bypass the throttle plate on decel if the manifold
vacuum is
> high
> > ...
> >
> > Steve B
> > San Jose, CA (USA)
> >
> >
> > > Does anybody knows for sure the role of that part in the CIS
system ?
> > >
> > > Part number is 035 133 563E (Bosch 0 280 160 143).
> > >
> > > You can see it on this EKTA PDF file, 1,33, 15-00 ,number 29.
> > > (http://filebox.vt.edu/users/rfitton/ETKA/1_33_15-00.pdf)