<tech> question about L-jetronic F.I.

[William Gau <william@xxxxxxxxxxxxx>]

Alright, a question for the masses:

I did a retro-installation of an FI system (vintage L-jetronic from a
`76 3.0 Si into a `73 Bavaria) and am having a few unexpected problems.

First off:

  1) I have a positive fuel flow to the engine;

  2) I have lots and lots and lots of spark and an ignition that is working;

  3) The cold start injector is emitting an impressive conical mist in the
right place :^)

  4) Not a damn thing is happening (i.e., the engine is not coughing,
sputtering, etc):

The engine is a 3.3 bored to 3.46.  The only thing that me and my crack
team of 
technicians can figure out is the following:

The ignition system is a new Mallory MSD 6A box, one of those BLASTER
coils, and
a mallory distro.  Somewhere buried in the Mallory propoganda is the
following blurb:

   "Some of the import vehicles are equipped with factory electronic fuel
injection.
  The EFI system requires a signal to synchronize the rate of fuel delivery
to the engine
  speed.  The EFI system control needs a signal very much like teh signal
needed by a
  tachometer.
   "On most installations with EFI or with an electric fuel pump, an MSD
P/N 8910 tach
  adaptor will restore the system back to normal.  Blah blah blah"

Obviously, the L-jetronic has an FI system that is controlled by the
omnicient brain
known as the "control module".  The control module gets all of it's info
about what the
holy hell the engine is doing from the coil.  What is it looking for is a
weak signal
usually generated by the stock points ignition.  What is is getting is the
20,000 volt
jolt-o-rama from the MSD box.  As a result (we speculate) it will not start.

Has anyone used one of these MSD adaptors to cure an EFI compatibility woe?

Someone write back while I finish putting trim on this car.

Scrambling to make O'fest . . . .

William Gau

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