[T3] Two Tests

Fri Sep 20 10:58:00 PDT 2019

KTPhil in SoCal has offered you his VW Tester & considerable expertise to
help you get it running right, but you haven't even taken him up on his
offer!
PS:  We moved from Redding, CA to Eugene, OR because it's always 15-20
degrees cooler!  :-)

On Fri, Sep 20, 2019 at 10:29 AM William Jahn <willjahn975 at gmail.com> wrote:

> I cant say for certain even though i do know that TS1 terminals were loose
> since now pulling the connector of is much more difficult. With them tight
> the only difference with it plugged in is it no longer pops out the exhaust
> when opening the throttle and letting off yet this may have been the result
> of other connections because I tightened them all . It still acts basically
> the same unplugged with the exception that it seems to run a bit better , I
> suspect it was because the terminals on #2 injector one was loose and I
> could wiggle it and the ohms reading would drop to equal what the other
> three read plus the ECU card when I cleaned it had quite a bit of black
> residue that came off using electronic cleaned and Q tips.
>
>  I can't say I understand this " In addition, I see that the temp sensor is
> in part of the circuit that drives the
> primary of the pressure sensor. An intermittent connection there might
> cause
> extra pulses to be generated in the pressure sensor output. That doesn't
> sound like a good thing. While we don't know that this is what's happening,
> it
> remains a possibility." Does this mean harm to the ECU or pressure sensor?
> Sounds more like it may cause an issue with the ECU.
>
>  I am willing to go with an ECU even if it is not the issue having a spare
> would not be a bad idea. I am just not certain if I can afford it until Oct
> or Nov . I had to pay my $125 registration fee this month even though it
> was due Nov 12th and since it's been so HOT we've had to run the window A/C
> and won't know what sort of electric bill this will generate until mid Oct.
>
>  I was going to try the 72 ECU yet I'm not sure if there is a point doing
> so. I do know I had it in before and it ran the same as with the 048 before
> I had this issue. I did try it in 2009 when this issue began and TS1 was
> still loose yet I only ran it for a minute. On the 048 the tag is on the
> top edge so I can see it just tipping the ECU a bit not removing it on the
> 72 all I see is a clean spot on the side that would face toward the outside
> of the car and it's a smaller area than the size of the 048 tag and almost
> in the center of the ECU side.
>
> On Fri, Sep 20, 2019 at 6:39 AM Jim Adney <jadney at vwtype3.org> wrote:
>
> > On 18 Sep 2019 at 14:54, William Jahn wrote:
> >
> > >  It seems to boil down to the ECU TS1 internal circuit. I would say
> it's
> > > slightly lean because of the reaction of unplugging TS1 yet I've read
> it
> > > could be either on Samba.
> >
> > My guess is that it's NOT the temp sensor circuit, because of the fact
> > that
> > unplugging that sensor has exactly the effect we expect. That seems to
> say
> > that that part of the brain is working, and making up for a fault
> > elsewhere.
> > That fault could be either inside or outside the brain, but you may have
> > narrowed it down to inside.
> >
> > > If it's not the ECU then it's possible the MPS is set to lean, yet two
> > > of them acted the same way even though one was a 0 280 100 101 / 311
> > > 906 051D in the car now 0 280 100 116/ 311 906 051E.
> >
> > Testing the ECU by substitution is the only way to go, once you've tested
> > everything else. You seem to have found some new loose connections and
> > those are always a problem. By far, the best way to do all those tests is
> > with
> > the Bosch tester, along with someone who knows how to use it.
> >
> > If you are willing to buy a buy a brain from me, I will offer to buy it
> > back from
> > you if you decide it doesn't help. You'd still end up paying for shipping
> > both
> > ways, but that would be $40 instead of $70. That's $50 for the brain and
> > $20
> > for shipping each way.
> >
> > OTOH, if the temp sensor connections was intermittent, that would send a
> > signal to the brain that was confusing. There's no way to know how the
> > brain
> > might respond to that. Unplugging the sensor would send a wrong signal,
> > but
> > at least it would be a constant signal.
> >
> > I wondered if there was anything in the brain that might smooth out an
> > intermittent signal from the temp sensor due to a bad connection. Looking
> > at
> > the schematics from Rennlist (they appear to have disappeared from
> > Rennlist, but I had copies) I see no smoothing elements in that circuit.
> > That's
> > from a Porsche brain, but I'd expect your circuits to be similar.
> >
> > In addition, I see that the temp sensor is in part of the circuit that
> > drives the
> > primary of the pressure sensor. An intermittent connection there might
> > cause
> > extra pulses to be generated in the pressure sensor output. That doesn't
> > sound like a good thing. While we don't know that this is what's
> > happening, it
> > remains a possibility.
> >
> > You asked how a worn set of trigger points could have an effect. If the
> > rubbing blocks were worn or out of adjustment, that contact might fail to
> > open
> > occasionally. (If they were VERY worn they would NEVER open and the car
> > would not run at all.) When just marginally worn, they can work sometimes
> > and not others. I've experienced this and it's really annoying, but it
> > happens
> > under load and while driving, so this is probably not what you have.
> >
> > --
> > *******************************
> > Jim Adney, jadney at vwtype3.org
> > Madison, Wisconsin, USA
> > *******************************
> >
> > _______________________________________________
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