[T3] Two Tests
willjahn975 at gmail.com
Fri Sep 20 10:29:31 PDT 2019
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
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,
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
> 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
> 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
> 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
> ways, but that would be $40 instead of $70. That's $50 for the brain and
> 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
> might respond to that. Unplugging the sensor would send a wrong signal,
> 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
> the schematics from Rennlist (they appear to have disappeared from
> Rennlist, but I had copies) I see no smoothing elements in that circuit.
> 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
> 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
> 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
> 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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