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On 2 Sep 97, Martin Peitz wrote:
> Melissa & Jim wrote:
> >
> > On 1 Sep 97, Martin Peitz wrote:
> >
> > > My 69 FI Sqrbk has an astonishing 9% CO at idle I just noticed.
> > > Amazingly it runs fine, gets 25 mpg at 75mph. I checked everything
> > > except the pressure sensor, which I know is slightly out of
> > > tolerance
> >
> > How do you know your PS is out of tolerance? I've never known anyone
> > that had the equipment to check it. If you know how to do this, I am
> > VERY interested!
> I tested the pressure sensor with the EFAW 228, which checks primary
> and secondary coil resistance. You can also do it with a VOM. So I
> didn't actually check performance under pressure (vacuum), though
> this should be possible with a good vacuum pump and meter. Injectors
> are new, ignition is new, engine is new, fuel pressure adjusted.
Okay, I understand. The primary and secondary resistances are only
approximate and are not the important factors. The PS is actually a
transformer with variable mutual inductance; the resistance will not
vary with vacuum. I have always wondered if there was a way to
verify (and correct) the factory calibration, but I have no info on
this. If anyone does, I would be very interested in it.
I believe I have seen a reference in one book to a Bosch tester for
the PS, but it did not give details. If anyone has details of
any kind please let me know.
Jim
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Melissa Kepner Jim Adney
Laura Kepner-Adney
jadney@vwtype3.org
Madison, Wisconsin
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