1984 4k - no start

[Ben Swann]

Vittorio,

I would stop concentrating on spark and ignition for now.  The Hall test checked out
good.   As long as you have good Plugs,  wires, Cap/Rotor, Coil and good connections,
ground and charged battery then I'd suggest problems lie elsewhere.

I don't recall hearing that you replace the O2 sensor - these will indeed cause poor
driveability when not working properly.

Ben

[From: "Bares, Vittorio" <Vittorio.Bares at nuance.com>
Subject: RE: 1984 4k - no start
To: "Tony Hoffman" <auditony at gmail.com>
Cc: quattro at audifans.com
Message-ID:
	<624BC75DA4460545849070E141EBCD6B0598CC17 at BN-EXCH01.nuance.com>
Content-Type: text/plain;	charset="us-ascii"

(possibly a 2nd send - sorry for dbl posting if it is)

I added a 4g ground from the batt to the engine block.
 
I also borrowed a known working coil from the same donor.
 
I did get some spark although it was inconsistent, sometimes yellow, sometimes white (on
the tri-electrode plugs - should I see spark on all 3-electrodes simultaneously?).

How do I go about testing voltage at the coil - my Haynes is indicating very specific
procedures so as not to damage components - but they didn't talk about measuring voltage
at the coil - any procedures?
 
I'm wondering also if the ECU's might be different between these cars - so tomorrow I'll
re-run all my tests with:

*       donor coil

*       donor ign control

*       original ECU and Altimeter

*       jumped fuel pump


What are the chances the distributor is faulty?

Thanks for everyone's suggestions and help - I'm sure we'll get to the bottom of this in
time...]