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[T3] Newbie--more data on FI

  Well here's where I am now.

There is no cold start valve, etc.

Checked the diaphragm in the pressure sensor (actually manifold vaccum
sensor) and it seems like no leak.

Checked the Temp Sensor I and Temp sensor II, they read 3.4K and 630 ohm at
35F ambient.

Cleaned all connectors on the engine with Corrosion X, a miracle corrosion
cleaner. Reconnected the two temp sensors.

Started engine again.  Started right up this time. seemed a little rich, let
it warm up to see if it was cold enrichment.  When warm the motor idled very
well, with no black smoke.  If I would get in the throttle to rev it up, the
exhaust would blacken, and do an overich backfire now and then.  While at
fast idle, I pulled the hose off the pressure sensor and the engine
immediately went very rich, black smoke like when we ran it before.  I
pulled the connector off the pressure switch, no change.  Pulled the
connector off the throttle switch, no change.  With the engine off I can
hear the throttle switch click like it is suppose to when you move it off
the stop.

I studied the Bentley manual last night.  I understand fuel injection fairly
well, as I have a plane I built with a two stroke fuel injected Hirth
(german) engine in it.  I have modified that motor quite a bit and have
completely reprogrammed the ECU (control module) to work with my mods.  It
seems to me now that on this Squareback, that I basically checked everything
and it's working or not affecting (pressure sw., throttle sw.) normal
running.  The electrical connections were probly not up to snuff.  The only
thing left to my inexperienced way of thinking at this point would be the
fuel pressure regulator.  I don't think it's ever been changed and it seems
to me it could be off after 36 years. The fuel pump has been changed.  If it
were regulating fuel pressure to some higher level, all running ranges would
be rich.

However, what do you think? I am so happy that this is working out.

Thanks for your help.  Aren't news groups just the most amazing thing?

Jim Showker

List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org

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