[DMCForum] Ignition questions:

["cruznmd" <racuti1@xxxxxxxxxxxx>]

Symptoms: When pulling away from a dead-stop, car stutters until RPM's
build up. Problem is -intermittant-. Amount of RPM's until to smooth
run-up varies.

Ballast resistor measures 1.0 ohm/.5/.5 ohms. Resistance across the
coil is 1.1 ohms (old coil), 1.5 ohms (new coil, which is correct)
Bypassing 1/2 or all of the ballast resistor produces the same
results. Cleaned all contacts. Plugs, wires, cap and rotor are new.
All H.T. wires checked for good connection.

Here's the twist: Installing ANY coil other than my original 23
year-old blue Bosch coil makes the problem WORSE. The car is barely
drivable. With the old coil, the car drives reasonably well, and very
well when the problem mysteriously disappears.

I am beginning to suspect my timing is failing to advance rapidly
enough, and/or far enough. My timing light broke so I'm off to buy a
new one right now. 

Question: The workshop manual lists degrees of advance per/RPM's. How
do I -precisely- measure this when the mark shoots off the scale?

The manual states: 

"...change the ECU when misfiring or jerky operation occurs, only
after first checking the following:
- Plugs
- H.T. Leads
- Position Plug Leads
- Distributor
- Ignition Coil"

Well, the only point I have yet to check is the distributor. I don't
really think it's the ECU but after checking the distributor, if it
looks like a duck, and quacks like a duck...

All advice welcome,

Rich A.
#5335

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