[T3] fi tester

William Jahn willjahn975 at gmail.com
Wed Sep 11 20:41:34 PDT 2019

I am right in the center of good OL Hollywood , off Highland Ave a block
south of Sunset blvd. If you are not in Los Angeles then it's pretty far
from here.

 I appreciate the thought , I absolutely do. I can deal with using a DVOM.
It's some sort of real oddball issue. I know I checked all the wires from
the ECU to each component and didn't find any issues in 2009 . Thing is
just moving the ECU might be enough to cause me to miss any wiring issue
even though the harness does not look  bad . I thought I might try another
head temp sensor that I have not tried in decades and see if the one in the
car has some odd issue since it's the one with the most influence. The one
in there now reads different at the same temp by 400 ohms so it at least
tells me I can't rely on it. When I pulled the one in the car to try an
after market one I didn't like how the threads on the AM one fit sort of
loose and noticed the wire on the one I'm using right under that clear
plastic cover has broken insulation about 1/8" the sensor metal crimp ,
even though the wire strands are in tact they are dark and not bright
copper. The spare I have is fine and tested out close to spec. It's just a
roll of the dice that it might change a thing yet I can hope.

 I've made some progress fixing the grounds a while back. It's at least
quieter since I put a gasket from the EMPI header the the mufflers three
bolt flange. Even after all I have tried with the air temp sensor out of
the picture it runs fine at all speeds. After I change the head temp and
see then I will see if I can find anything that might cause the air temp
sensor to act up as it does. It could be the sensor itself , I had a spare
yet the plastic connector was broken off. All the sensor wires are still in
the stock covering and that has not been compromised . I also need to check
the voltage right at the ECU from the power relay now that I repaired the
relay there is still a double connector that looks untouched yet it might
have high resistance.

 If all else fails perhaps the Bosch tester might find what I cannot.


On Wed, Sep 11, 2019 at 5:24 PM Phil Ostronic <phil.hof at ostronic.org> wrote:

> Where are you located?
> I have a pair of testers. I am northwest of Los Angeles.
> Phil
> Sent from my iPhone
> > From: William Jahn <willjahn975 at gmail.com>
> > To: type3 at vwtype3.org
> > Subject: Re: [T3] On my 73 square , what should I look at on the
> >    breather with a PCV
> >
> > I don't know of anyone here who has a D-jet testor . To add Ray works on
> > VW  T-4 so perhaps the ECU is different. I would imagine the temp sensors
> > would be wired the same way. Also on a 73 T-3 with the EGR uses pin 14 on
> > the ECU for the EGR so the TPS 14 and 17 daisy chain through the EGR
> relay
> > to the ECU . I removed the relay since it no longer has the EGR valve > I
> > just left it connected yet it ran fine then , did notice on none Calif 72
> > and all earlier systems 14 is not used they place 14 from the TPS
> including
> > the 5 pin models to ground on the case half ground trees.
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