Date:         Thu, 17 Jun 2004 08:42:45 +0200
Reply-To:     Calle Fallberg <calle.fallberg@TELIA.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Calle Fallberg <calle.fallberg@TELIA.COM>
Subject:      Re: Cold idle mystery
Content-Type: text/plain; charset="iso-8859-1"

Mike

Iīd start looking for leaks in airhoses (vacuum), intake manifold and
gaskets and also contact spray all connectors back there...
Iīd also check the time since the latest fuelfilter change if itīs the big
filter under the floor model.
And airfilter, if itīs full of dust it might be like an additional choke
which might fool the CPU
Itīs wise to do a little at the time so you see what the problem really was
though :-)

Good Luck
Calle

----- Original Message -----
From: "Mike D." <md03@XOCHI.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, June 17, 2004 1:37 AM
Subject: Cold idle mystery


> Ok, time to put on your thinking caps.  Can anyone solve this by
> sheer brain power alone?
>
> Details:
>    1985 1.9l Westy w/Auto Trans and Air Conditioning
>    145k miles
>    Compression fair (around 120-125 each cylinder)
>    Recently replaced Digital Idle Stabilizer
>    Recently replaced AFM
>    Timing @ 5BTDC
>
> Symptoms:
>
> When warm runs fine.  Get 17-18mpg on the highway @ 65mph, so I don't
> think there is any gross mechanical problem with the engine or
> mis-tuning.
>
> When cold (60F), it starts right up, but quickly (either immediately,
> or within a minute or two) the idle is rough and the engine will die
> when in Drive, and sometimes even when in Neutral.   I have to keep
> one foot lightly on the accelerator to keep it from stalling.  Within
> about 10 minutes of driving, the problem goes away.
>
> I've tried setting the idle higher when cold (with a few turns of the
> idle adjustment screw).  This solves the stalling problem when cold,
> but then when the van is warm, the idle is way too high (1500+ rpm).
>
> I've gone through the Bently and done most of the electrical digijet
> diagnostics  (resistances of temp senders when cold and hot, etc.)
> without finding anything amiss.
>
> Ideas?
>