If the tach gets erratic with the engine (instead of fading gracefully as
the revs die) then the problem is in the ignition LT circuit. If the
ignition warning light flickers as well then it is back from the white
through the ignition switch onto the brown. If the warning light is OK then
it is in the white/brown from the fuse block - external ballast -
white/green - coil - white/black - points circuit.
Could be coil breaking down internally when it gets up to temp, a points
wire broken inside the insulation, loose points nut, or bad connections
between wire and connector, or connector and spade anywhere in the circuit.
Since goosing it (how do you get your fingers up the exhaust pipe when
driving?) seems to clear it a broken wire or loose parts inside the
distributor is a fair bet, since the distributor plate will move and this
will wiggle the wires.
However if the turn signals also start affecting the tach at this point,
both of which are on the green circuit, a problem in the 12v feed to the
green is indicated (Ho!). This can't be the fuse since the fuse isn't in
the ignition circuit, but it could be the white/brown connectors on the fuse
block or possibly the ignition relay.
PaulH.
----- Original Message -----
From: Robert C. Galli <rcgalli@ix.netcom.com>
To: <mgs@autox.team.net>
Sent: Wednesday, May 10, 2000 1:21 AM
Subject: Galli's 78B
> Drive 15 - 20 minutes with no problem - runs strong, etc. Then, tach
> becomes erratic - goes from actual to "0", I goose it, it goes back to
> actual. Turn signals also now (after 15-20 mins, but not before) cause
> erratic tach movements (didn't do this for first 15 minutes or so).
During
> the erratic period, the engine will sometimes begin to die - goosing to
> 2500 or so brings it back. Sometimes, while coasting (even in gear) the
> engine will die. In all cases, so far, it starts up quite nicely and runs
> for a minute or so before going thru the problem cycle. In 15 mile trips
> (to-from work - 2 trips so far), it has stalled maybe 4-6 times total. it
> sometimes 'flutters' before getting very balky.
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