[DML] Ignition breakdown

["cruznmd" <racuti1@xxxxxxxxxxxx>]

Symptoms:

Car stutters upon take off from a dead-stop, but smooths out once 
RPM's build up.

Ballast resistor resistance increases as it gets hot, from .5/.5 
to .8/.9 ohms.

Input voltage to the coil is around 7 volts. (A bit low, I think)

I checked the timing, which was around 9 degrees. Once set at 13, 
performance improved somewhat. The timing -appears- to advance 
properly. The manual gives 2 tables; one for vacuum advance and one 
for centrifugal advance. Advance appears correct for each method. I 
noted 3 steps up for vacuum, and with my timing light I verified 
them, and then I disconnected the vacuum line and checked centrifugal 
advance the same way. (Revving engine and noting advance vs. the 
manual information)

Cap, plugs, rotor, wires are new. The coil is the 23 year old, 
original blue Bosch coil. Here's the kicker: I have a NEW Bosch coil, 
and the car runs WORSE when I install it. Resistances across both 
coils measure correctly.

I'll replace the ballast resistor, but what other parts could be the 
cause? It almost seems as if the timing advance "sticks" and then 
catches up, but I've checked that. I know that people usually frown 
upon blaming the ECU's but I'm starting to wonder.

Thanks,

Rich A.
#5335




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