Date: Fri, 19 Sep 2008 21:10:32 -0700
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: Van Stalls Easily when totally cold.
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
auxiliary air valve is one suspect.
There sure would be a lot of idle stabilzers sold if everyone replaced them
for just broken plastic mounting tabs.
it's very 'normal' for them to be broken, but I like having a spare around.
one test to see if the Aux air valve is supplying any air right after a cold
start is to pinch off one of the big hoses carrying air that goes through
that valve, and see if that makes the idle slow down. If no change, you can
conclude ...........probably ............that the Aux Air Valve is not
letting extra air in when cold for a faster idle speed.
it's conveniently mounted so it's a bit hard to get to.
I think they don't seem to do much, but the way they are supposed to work,
is that when cold, they are 'open' via a temperature sensitive spring .
As the engine is running, 12 volts is supplied to a heater element inside
the valve .............and that causes it to slowly close.......
so about the time it's fully closed, the engine is warmed up enough to idle
at normal speed without the extra air that was supplied by the aux air
valve.
Always remember to consider and look for intake and air leaks in general.
They can really mess things up.
The fuel injection system is very dependent on 'air management' in the
intake tract, like there can not be any air leaks at all.
Scott
----- Original Message -----
From: "pickle vanagon" <greenvanagon@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, September 19, 2008 6:38 PM
Subject: Van Stalls Easily when totally cold.
> Lately, our westy has exhibited difficulty maintaining its idle in the
> first
> minute or so of cold running. It idles very low during this period, and
> if
> you don't nurse it, will cut out. (For example, if you rev the engine,
> then
> when it comes back down it will probably die).
>
> After 1-2 minutes, everything is perfectly peachy. Gas mileage is still
> very high.
>
> I've tried:
> swapping out the temp 2 sensor with an extra one
> setting the warm idle rate to spec (850 rpms) with the adjustment screw
> with
> the stabilizer bypassed
> a new idle stabilizer (needed one anyways because the plastic tabs broke
> off
> mine)
> checking the idle switch (it clicks and functions correctly, at least
> engine
> breaking fuel shutoff works)
>
> Any suggestions on where to go next?
>
> Thanks very much,
> Wes
| 
