Vacuum Diagrams

[jdbubb at verizon.net (Dan Bubb)]

I'd think you should optimize your fuel settings for warm running as you 
suggest.
I'm sure that the TEC II has a priming pulse, after start enrichment and 
warm up enrichment (at least the systems I've seen have these) that you can 
optimize for any cold start/cold running condition. Also, the TEC II should 
automatically vary the amount of fuel injected depending on intake air temp 
to accomodate variations in air density.

Engines without idle speed controllers, in my experience, do exactly what 
yours is doing. If set for a 1000-1100 RPM idle while warm they will be at 
700-800 when cold. If they're run hard they'll idle higher. There is just 
enough change in the load on the engine due to oil viscosity that the idle 
speed is going to vary like this.

There is one trick you can use that might help some and that is to set your 
ignition advance table with one RPM column at the desired idle speed and 
another RPM column a few hundred RPM lower. Say, 1000 RPM and 600 RPM. Set 
the advance in the 1000 column at 6 or 10 or whatever value you want to idle 
at. Advance the ignition in the 600 RPM column to something around 20. 
Engines idle faster with more advance. If the idle drops for whatever 
reason, the TEC II will kick in more advance and tend to stabilize the idle. 
It won't fix the issue, but it will help.
The "correct" fix of course is to find out what ISV the TEC II can control 
and hook that up.
In short it doesn't sound like a vacuum line problem to me.
Dan


From: "Don Walter" <dswalterwi@gmail.com>
Sent: Wednesday, July 27, 2005 1:15 PM


I have no Idle speed controller at this time.
All I can play with is the fuel amounts though two settings:
1) an offset value set at zero now
2) the total amount of fuel used though out the range.
 I am assumming that I should focus on the settings when it is warmed up and
try to figure out what is changing at that point in time.
 Dan is right I am running an Electromotive TEC II without any of the stock
CIS stuff so most of the standard answers won't apply but you never know it
is the simple things that get you.


 On 7/27/05, Dan Bubb <jdbubb@verizon.net> wrote:
>
> What kind of idle speed control do you have?
>
> If you don't have idle speed control of some sort then the difference in
> idle speeds between hot and cold that you're seeing is about normal.
> There's just that much extra effort required to turn everything in the
> cold
> oil.
>
>
> > From: "Don Walter" <dswalterwi@gmail.com>
> > Sent: Wednesday, July 27, 2005 10:27 AM
> >
> > Are there any good vacuum diagrams of the complete car? I have looked
> > through the Bently and they have ones that show the vents and I was able
> > to
> > fix my Vents that now open and close by putting them on their own
> seperate
> > line but there are other vacuum hoses going all over that I am not sure
> > what
> > they are for. Two go out through the fender and to what I think is the
> > Charcol canisters for the Gas tank to breathe but I am not sure. I think
> I
> > may have a vacuum leak but can't seem to determine if I do or not. I
> don't
> > want to cap off those lines unless I know what they are for and the
> result
> > if I do.
> > The problem I am trying to solve is when the car is cold it will idle
> > around 600-800 rpm but after it gets warmed up (above 80 degrees Celcius
> > oil
> > temp) the idle hovers around 1200 rpm. It may not be a vacuum problem at
> > all
> > but something else. Remember that I do no have any CIS-E in my car
> anymore
> > when responding.
> >
> > --
> > Don Walter - Waukesha, WI
> > 1986 2.0L 16V TEC 2 Black Scirocco (see progress at
> http://www.cardomain.com/memberpage/708939)
>
>
>


-- 
Don Walter - Waukesha, WI
1986 2.0L 16V TEC 2 Black Scirocco (see progress at
http://www.cardomain.com/memberpage/708939)
1986 2L 16V Toronado Red Scirocco (under repair)
1988 1.8 16V Toronado Red Scirocco (sold on 3/29/04)
1984 1.8 8V Pewter Scirocco (sold years ago)
1971 Karman Ghia (sold)
1969 Karman Ghia (sold)
1969 Beetle (sold)