Date: Mon, 6 Jun 2011 13:54:15 -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: Cold start issue
Content-Type: text/plain; format=flowed; charset="utf-8"; reply-type=original
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
>> > >
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