1980 240 won't start, have weak spark at coil, i am assuming that if it were the ignition control module i would have no spark, does anyone know for sure? anyone know of short cuts in tracking this problem down or have had any such problem themselves?
thanks

 

Cap and rotor look ok?
How old are they?
Are they OEM or aftermarket?

 

cap and rotor are fairly new bosch, that wouldn't be the problem since the
weak spark is at the coil, i am assuming the problem would be coil, ballast
resister, relucter-sending unit in distributor or wiring - bad ground? what i am
not sure is if the ignition control module would put out any spark at all
if it were faulty, i know i am due for a new o2 sensor (lambda sond as the
swedes called them in 1980) as the car just rolled over 60,000 miles and
also i have had that typical ( in my experience) rough cold start that i
think is the cold start valve although it has always started right up easily
until now, i have never known o2 sensor or cold start valve to cause a weak
spark before, car is all original except alternator, tires, tune-up, exhaust
and motor mounts so everything else is 37 years old just not a lot of miles,
my ohm meter has been giving me mixed readings on the coil and ballast
resistor so i need to pick up a new test meter before i can be sure about
those parts, i thought maybe someone might have had a similar problem, the
1980 240 seems to be somewhat different than earlier or later 240's
thanks for what ever help you may have

 

Maybe the coil.
Not all that much to mess with the spark out of the coil.