Help with CIS

[Nate Beck]

 I tried to measure the o2 sensor using the 2volts dc setting on my
multimeter.  With the negative lead on the negative side of the battery and
the positive lead on the o2 connector and there is no reading on the o2
sensor.

When I took it to my mechanic he was trying to adjust the fuel pressure
regulator and there was no reading on that.  None at all, it was at 0.  He
says that it is not getting any signal.

The block ground is in place, and the 2 grounds that are on the intake
manifold are in place and well.

I am not sure what the cpa is, please inform me so that I can check it.

thanks for the help

-----Original Message-----
From: Huw Powell
To: Nate Beck
Cc: 'quattro at audifans.com'
Sent: 2/11/2003 8:54 PM
Subject: Re: Help with CIS


> Well, I went over my engine and replaced the braided vacumn lines with
new
> ones.  So then I decided that I was going to try to tune my CIS-E so I
> hooked up the multimeter and all.  No signal whatsoever.  I even went
back
> to my old o2 sensor, still no signal.

You are measuring the output voltage of the OXS relative to a good
ground while itis hooked up, right?

 > So I took my car to my "oh crap"
> mechanic and he says my electronics are fubared.

The OXS doesn't really depend on the ECU, although of course the ECU
must be working for the OXS output when warm to be a nice varying
signal.

> If you remove the "spare"
> fuse the engine revs up, not down.  I would think that when I remove
the
> spare fuse the engine would die or start to sputter.  Does anyone have
any
> ideas?

what you see is correct, and also, btw, proves that the ECU is at least
partly working, since it runs the ISV.  Your ISV is probably one of the
ones (you don't say what year or model...) that is partly open at rest.
  At idle, the ECU action results in it being more closed than that, so
when you kill off the ECU by pulling its fuse, the ISV opens up a bit
and the engine speeds up.

> My car is running so rich it is stinkin bad, and my gas mileage is
> horrendous.

Is the block well grounded?  Are the intake manifold grounds in place
and good?  have you tried measuring the CPA current?

--
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/