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Re: [GMCnet] Reviving the Cad 500 [message #163309 is a reply to message #163295] Sat, 17 March 2012 19:40 Go to previous messageGo to previous message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
Senior Member
Ken,

You've warmed the cockles of my heart (whatever the heck that means!).
Now I don't feel nearly as bad about my week with all it's
defugalties.

Today went a little better:

I tackled the shorted VSS. Turns out, I'd had to work on it once
before. There are 3 leads (+12VDC, Gnd, Output) coming out of a small
molded plastic housing which contains the Hall Effect sensor and
whatever other circuitry. Those wires have VERY heat sensitive
insulation and are of larger than necessary gauge. When I worked on
it before, the length of the accessible wires was left at about 5/16".
There is no residual insulation on any one of the 3 wires -- just one
glob through which the wires run. I was able to spread the wires 120*
apart and solder new long leads to them without creating a new short
-- at least for now. Then I covered the whole mess with Shoe Goop
(Yes, that's what I said -- it's good stuff for lots of things and
sets up fast). Then put a couple of layers of shrink tube over each
wire, extending down into the Goop. Finally, several layers of shrink
tube over all 3 wires and the exposed portion of the housing. MAYBE
it will hold up down there under the exhaust manifold. Or maybe I'll
soon re-install a short speedometer cable to position the VSS in a
cooler area.

For the first time, I disassembled the whole VSS. Its housing
consists of two shells sealed with a gasket and held together with 4
machine screws. In one half is a wheel containing magnets oriented
perpendicular to the above mentioned sealed module. As one pole of a
magnet passes the Hall Effect sensor, the output line is Set. When a
pole of the opposite polarity passes, the output line is Reset. So,
the establishment of the "2-pulse" or "4-pulse" or other rating is
determined by the number of magnets in the molded magnet wheel -- sort
of like the Pertronix ignition modules. It's easy to test -- don't
need the 'scope or rotary driver I've used in the past: Just supply
power and monitor the output with an analog meter -- or possibly a
test lamp or LED.

Another good event today: I installed the E8094 fuel pump. 17psi max
vs the 125 psi max E8228. I'd expected to have to touch up the
regulator setting. Nope. It runs just fine as-is. During a
subsequent test drive, I even did a full-throttle hill climb which
called for 96% injector duty cycle -- no sign of any starvation. I'm
happy.

We'll be making a 200 mile test run tomorrow for Jerry Holloway's
birthday party. If all goes well, we'll head for Shawnee on Tuesday
AM.

Ken H.


On Sat, Mar 17, 2012 at 7:46 PM, Ken Burton wrote:
>
>
> It is always something extra going wrong.
>
> I went out today to replace the engine battery in my airplane and take a flight of about 100 miles.  It should ave been a 15 minute job.  I immediately got stuck working on two chain saws for a friend who showed up unannounced which put me a several hours behind schedule.
...
> So, Do not feel bad Ken.  Nothing ever goes right for me either.
> --
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
 
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