Date:         Tue, 4 May 2010 23:20:12 -0400
Reply-To:     Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject:      FW: Starts day, won't at night ...
Content-Type: text/plain; charset="us-ascii"

The thermal time switch (TTS) and cold start valve operate complexly
independent of the ECU or any other sensors.
The switch itself consist of the temperature switch, and a heating element.
The circuit gets it power from the starting switch or contact on the
solenoid.
Of the two wires on the switch, one is the feed from that starter circuit
and the other connects to the cold start valve. The wires MUST NOT BE
SWAPPED.
When cold enough the switch is closed. While the engine is cranking the
closed switch allows power to the cold start valve and the heater in the
switch. After a few seconds of cranking, the heater in the switch will cause
it to open effectively turning off the valve. This prevents flooding the
engine.

After the engine starts warm up enrichment is controlled by the temp 2
sensor and raised idle speed provided by the auxiliary air regulator.

Repeated attempts at starting with a low battery or other problem will cycle
the cold start valve with each attempt. This can flood the engine or done
enough can actually fill the cylinders enough to lock the engine.

Dennis


-----Original Message-----
From: Zoltan [mailto:thewestyman@gmail.com]
Sent: Tuesday, May 04, 2010 2:38 AM
To: Dennis Haynes
Subject: Re: Starts day, won't at night ...

Yes, that's correct.  What I don't know is, that the Thermo time switch is
working with heat on it's own or it's getting temp from the Temp. II sensor.

I got zero reading from the TTS at the cold start valve plug, when cranking.
Zoltan


----- Original Message -----
From: "Dennis Haynes" <d23haynes57@hotmail.com>
To: "'Zoltan'" <thewestyman@GMAIL.COM>; <vanagon@GERRY.VANAGON.COM>
Sent: Monday, May 03, 2010 9:56 PM
Subject: RE: Starts day, won't at night ...


> The air cooled engines have separate cold start injector which is
> controlled
> by the thermo-time switch.
>
> Dennis
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Zoltan
> Sent: Friday, April 30, 2010 6:07 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Starts day, won't at night ...
>
> As the headline says.  This is a 1982 air-cooled van.  Daytime, when it's
> a
> little warmer, it starts right away.  But somehow at night or early
> morning,
> when it's a little colder, it won't.
> I know, there are two temp. sensors and usually the temp. II sensor is the
> one I would change.  I just haven't experienced this kind of behavior.
> Maybe none of you would know and send me a message about it, and I will go
> out and buy a Temp. II sensor and see if it works.  But what if the Temp.
> I
> (one) sensor is the one that is not working as it should?  I never heard
> of
> that to be changed.
> My respects to the List.
> Zoltan
>