Date: Mon, 5 Oct 2009 19:53:37 -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: Coolant Temp Sensor Test. Generic vs VW.
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how much is the OE one ?
that's what I'd want in any case.
hard to say if it's manufacturing tolerance differences, or cheapness, or
age or what.
higher resistance is richer, so the no name on your list would always run a
bit richer.
Can't remember off the top of my head if your engine has a cold start
injector.
I think not, right ?
I'll tell you though.......those can sure be handy for a manual 'shot of
fuel' in the intake manifold.
I have a old and near free Mercedes Benz 450 SLC with non electronic CIS
and a weak or bum warm up regulator gizmo .....
I wired the washer button to the cold start injector - a few taps to fire
her off, a few taps to keep her running at cold idle or a minute or so .....
then she idles fine.
since it says 'intermittent short to ground' .........
you've checked that entire wire extra carefully ?
I don't actually *believe* it is really a short to ground, just because the
ecu says so.
But that does make me think it's more or other than the sensor possibly.
it's easy to try different sensors, so a logical thing to me would be, see
if it does it with various individual sensors.
If it does it with all of them, then it's are more likely that it is not the
sensor.
you don't have a spare ecu do you ?
I recall there was an issue that was finally thought to be caused by drawing
too much current through the stock '15' ignition wire.
Might this be a similar wiring thing, or related even ?
Scott
www.turbovans.com
my favorite code is the one that says 'non-intermittent shortage or leakage
of fluids or electrons.'
which covers everything of course .........all non-intermittent ones that
is.
----- Original Message -----
From: "neil N" <musomuso@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, October 05, 2009 7:31 PM
Subject: Coolant Temp Sensor Test. Generic vs VW.
> Hi all.
>
> Temp/resistance graphs in my Vanagon and Mk3 Jetta Bentleys appear to
> be the same. Based upon that, it may be that the Mk3 Jetta and Vanagon
> sensors have the same specs. If so....
>
> My VanaJetta swap has had a long standing intermittent hard start
> issue when engine warm. Wasn't really a problem. But twice finding
> this engine error: "ECT - Intermittent Short to Ground", finally got
> me off my butt to check things out. Since I have the sensor that c/w
> engine (Possibly OEM? Has VW stamp. Made in Luxembourg), figured I'd
> test and compare it to the suspect no name sensor.
>
> Heated each in water, 70F to boiling I see ~ 600 to 23 ohm difference.
> (below)
>
> Ironically, since I chose to install a new one at time of swap, the
> "VW" sensor seems within spec. The newer suspect one doesn't, but is
> close. Since it was close.....
>
> Do the resistance value differences between the two sensors indicate
> manufacturing differences (possibly quality control) or is the No Name
> just a failing coolant temp sensor?
>
> Personally if the differences are due to lack of quality control, I'd
> be tempted to spend the $ at the dealership if an OEM part can be had.
>
> Neil.
>
> Test pics:
>
> http://picasaweb.google.com/tubaneil/ECTTesting#
>
> Results:
>
>
> On stove at "Med" to 80F, then "Max" to boil. At 212F for 1 min.
> Converted to Celcius. Water stirred until boiling. Ignore the decimal
> point!
>
> No Name VW
>
> 21C 2900 Ohms 2300 Ohms
> 27 2440 1920
> 32 1940 1550
> 38 1656 1300
> 43 1360 1070
> 49 1130 890
> 54 932 750
> 60 780 640
> 66 666 530
> 71 555 450
> 77 470 380
> 82 400 325
> 88 337 278
> 93 286 240
> 100 217 194
>
>
> --
> Neil Nicholson '81 VanaJetta 2.0 "Jaco"
>
> http://tubaneil.googlepages.com/
>
> http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines
