I removed some parts. Did I screwup?

[drew at scirocco.cs.uoguelph.ca (Drew MacPherson)]

In Canada we have a mandatory vacuum routing diagram under the hood for 
emissions purposes - I expect the US is the same.

I'm a little fuzzy on the exact routing, as it's been some time since my 
Scirocco has had this setup, but I think it goes something like this - a 
check of the missions sticker can confirm this:

A vacuum-operated check valve (looks like a little flying saucer t'd into 
the intake bellows at the throttle body) opens under certain vacuum 
conditions (high vacuum - part throttle light load or decel likely.)

When the valve opens, it allows PCV or filtered air to flow through the
large black hoses that run to the charcoal cannister, presumably
collecting any collected gasoline fumes along the way, into the intake.  
If I recall correctly, there's a Y in the line to the idle-air boost
selonoid that runs between the bellows on the fuel distributor and the PCV
hose.  All of this lot is interconnected with various little restrictors,
venturis and T's to make it all work reliably, no doubt... :)

The vacuum that operates the check valve is T'd into the distributor's 
vacuum advance line.

Does that make the system any cleared than mud?

Drew


On Mon, 21 Jul 2003, Dave Ewing wrote:

> > The cannister holds the fumes from the gas tank. Once you start the car
> the
> > engine sucks air through the cannister and purges any gas fumes by burning
> > them in the engine. This restores the capacity of the cannister.
> > I think it's always good to understand how things really work before
> > disabling or modifying them.
> 
> Sorry but I didn't see anyway that the fumes would be sucked back out into
> the motor especially with the way the vacuum lines were set up.  The fumes
> would have to go through the vacuum distributor or amplifier which has a
> type of booster type rubber diaphram in it (if I remember correctly).  So,
> if this was suppose to work dependably then they wouldn't have gas fumes in
> contact with rubber.  Sounds like a great theory and you may be right, Dan,
> but it doesn't hold water with me.  Sounds like a bunch of theories to make
> the environmentalists think we are trying to prevent global warming which
> isn't happening.
> 
> I believe it's always good to understand how things REALLY work before
> disabling or modifying them!
> 
> Dave
> 
> 
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