You guys are so smart. I unplugged, peered at, added a bit of contact
cleaner into, then re-plugged the connector back into the Temp 2 sensor,
and now the van is right as rain.

On Mon, 2011-06-06 at 13:54 -0700, Scott Daniel - Turbovans wrote:

> re
> Reads 3.4K ohm @ 13 degrees C, which is smack dab in the middle of the
> > >expected correct reading per figure on Bentley page 24.19.
>
> These sensors can be 'nebulous'.
> In other words ..if they do spec right ..
> it can still be poor contact ( worked on that on an 84 for quite a while one
> time ) at Temp Sensor II, or the sensor itself.
>
> I suspect you might have gotton the common cheaper aftermarket one two years
> ago.
> The OE ones are better..
> and ...seriously ...contact to that sensor ..
> like spark plugs wires ..once in a while you can go nutty on an engine
> problem and in the end it was just ( nebulous also ) spark plug wire, or
> ..........contact at the sensor.
>
> I have also seen them be ok cold, but wonky hot, etc.
>
> if it was a hundred dollar part ...we'd rather not take a chance on one
> unless we think that's really it.
> but at 10 to $ 35 ...and you should have a spare anyway ..
> worth trying.
>  wiggle the wires to it while the engine is idling. Gently ..but try that.
> or better yet,
> ohm check from the ECU connector on the right pins while you wiggle, key
> off, engine off.
> See if the ohm meter reading acts up.
>
> there are times when a new one just makes a difference.
> and always be suspect of the connecion there.
> it is 27 years old after all.
> Wiring does deteroiate in VW's over time.  And the most stress and wear is
> on the ends..at the connectors.
>  ( might try with O2 disconnected, just for the fun of it. That 'could'
> reveal something. )
>
> scott
> www.turbovans.com
>
>
> ----- Original Message -----
> From: "Rocket J Squirrel" <camping.elliott@GMAIL.COM>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Monday, June 06, 2011 12:12 PM
> Subject: Re: Cold start issue
>
>
> > Thanks, Rob. In the interest of keeping posts trimmed I try not to
> > repeat myself. In my initial post, and a couple after that, I said that
> > the van only has the cold start problem at the first start of the day.
> > From then on, no problem, even after it's been sitting for a few hours.
> >
> > On Mon, 2011-06-06 at 11:17 -0700, Rob wrote:
> >
> >> That's 55 degrees F, that's cold and you know it starts well when
> >> cold, drive it & warm it up to when you have the start problem and
> >> test it then.
> >>
> >> Rob
> >> becida@comcast.net
> >>
> >> At  6/6/2011 10:50 AM,Rocket J Squirrel wrote:
> >> >Reads 3.4K ohm @ 13 degrees C, which is smack dab in the middle of the
> >> >expected correct reading per figure on Bentley page 24.19.
> >> >
> >> >So I must look elsewhere for cause of trouble.
> >> >
> >> >On Sun, 2011-06-05 at 13:59 -0400, David Beierl wrote:
> >> >
> >> > > At 01:22 PM 6/5/2011, Rocket J Squirrel wrote:
> >> > > >Stupid thing. I already replaced it once, about four years ago.
> >> > > >What's
> >> > > >up with that part? Lousy design?
> >> > >
> >> > > Good to have a spare, even though the 1.9l ones cost more than the
> >> > > 2.1l.  But certainly no harm to unplug/replug, exercise the
> >> > > connection.  And to get more information, before you do that wait
> >> > > overnight then unplug the ECU and do the resistance check on 24.20,
> >> > > third step.  If you get a reading at that plug that's within spec for
> >> > > the temperature (see previous page) it would suggest TII is not the
> >> > > problem.  If it's out of spec, check/clean connection at sender, see
> >> > > if that fixes.
> >> > >
> >> > > Yrs,
> >> > > David
> >> > >
>