no spark

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ddettloff

ddettloff

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Ok I have a 67 cuda 318 was running fine now wont start cranks good but no spark from coil.
checked coil and replaced still no spark ballast resistor has 5.3 ohms of resistance at a loss right now any advice.:banghead:
 
make sure the EI box is thoroughly grounded to the body. make sure your battery to block to body grounds are solid. my first thought is the ignition box took a crap on you, but they do lose their ground over time, the box case to the body is its ground
 
grounds all checked and are solid, it started earlier ran for 5 min then died now nothing but cranking
 
Hook a temporary clip lead from a battery source to the coil + and see if you get spark

If not, inspect the reluctor and pickup in the dist. for damage, rust, debri. Wiggle all connectors in/ out to scrub them clean and "feel" for tightness. Inspect them with a flashlight for corrosion, other damage.

Hook your multimeter on AC volts THAT'S RIGHT AC volts to the distributor connector and crank the engine. The pickup should generate about 1V AC

Check the pickup for continuity. It should be open from either connection to ground. Actual resistance does not seem to be critical, somewhere from 200-500 ohms.

Remove and inspect the box/ mount for rust, clean it up, scrape the rear of the box ears, and use star washers. Consider adding a no12 or so ground wire from the block to one ECU bolt as well as the regulator

Put your meter on the coil and see what you have for voltage, key in run, as well as cranking. Cranking should be close to same as cranking battery voltage, and in no case below 10.5

Put your meter on the coil NEG terminal (or a test lamp is better) and crank. The lamp should flash, the meter should show rapid pulse.

Also try with key on, ground each ECU side distributor harness connector and check for spark. One or the other should trigger a spark.
 
5.3 ohms doesn't sound right. Pull the connectors off, jumper them together, and see if it starts.
 
this is all i have tested, i have volatage at the key source while cranking. there is no voltage at the alternator regulator/voltage regulator. there is no volatage at the msd. there is also no volatge going to the coil? these have all been tested with a fluke/multimeter. i have also jumped the balist resistor with a jumper wire still a crank no start.
 
jumped ballast resistor car started did same thing ran few minutes then died will not restart
 
Check the voltage at the starter solenoid. Is it 12 volts at the run terminal? Try jumpering this out to see if it starts then by going directly battery + to the ballast resistor (is that what you already tried?). Then if that doesn't work, try the jumper to the coil side of the ballast resistor. That will tell you if it's the ballast or the starter solenoid.

Good luck!
 
Bulkhead connections would be my first thought with a loss of power that widespread.
 
Thank all of you for the help, got it solved took apart all the grounds as suggested fired right up.
 
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