T3: Re: Further adventures in FI

[stans4@ibm.net (Stan Schaefer)]

I don't recall you saying what year you have, but the '73 engine at
least, has a tube out the front(front is car front) of the intake air
distributor, sucks crankcase fumes from the filter/separator unit to
the right and in front of the fan housing.  If you don't have  a'73(or
even if you do!), look for signs of tampering on the pressure sensor.
There should be a plastic cap over the adjustment screw on the
opposite end from the hose and electrical connections.  When I got my
'71, this had been screwed in tight by the idiot previous owner, ended
up getting another one.  Had about 5 mpg and black smoke.  If that cap
is missing, I'd suggest hunting for a known good one.  With a known
good one and a signal generator and oscilloscope I could probably
recalibrate one, but it would probably never be like one set up from
the factory.  I've also had that auxilary air regulator(dingus in the
pump hole) have a stripped adjustment lock screw, idle wandered all
over the place.  Needs to be checked, my first one was stuck in place.
This wouldn't give you extremely high idle by itself.  Don't mess
around if that vacuum hose is the original cloth stuff, replace it.
I've had that stuff crack under the cloth where you can't see it,
caused all sorts of grief.

On Mon, 16 Mar 1998 15:49:33 -0800, you wrote:

>Over lunch I checked, as best I could, for vacuum leaks. This was suggested
>by Greg.
>
>There were indeed a couple of opportunities for air to get in at either end
>of the pressure sensor tube. I installed/tightened a couple of hose clamps.
>This still did not fix the problem.
>
>I have some suspicions that I might have a really major air leak somewhere
>in the intake manifold. With the fuel pump off, the engine is able to get up
>to about 3500 RPM for a good 20 seconds. I can't imagine it could pump that
>much air through the almost completely closed butterfly valve, and I don't
>think it could run off the volume of air that is present in the manifold for
>that long. I tried pinching off the hose that goes to that thing that sits
>where a mechanical fuel pump would (I forget what it's called), but to no
>avail.
>
>Aside from the four big tubes to the cylinders, the one big tube to the air
>cleaner, the small tube to the pressure sensor, and the slightly larger tube
>to the thingy, is there anything else connected to the intake manifold that
>could let in big quantities of air? Am I missing something?
>
>Also, could someone diagram how the fuel injectors are supposed to sit in
>their little holes? Is it easy to screw up installing them?
>
>Thanks,
>
>-Frank
>