Sprint time engine failed to start. After checking on the usual suspect I've found that the spark between coil lead from the distributor cap and the cylinder head was very weak. It was yellowish and I had to almost touch the head with the lead. My engine has EI module and 3 Ohm Petronix Flamethrower coil connected via a ballast resistor. I've done the following tests:
1. Checked voltage between coil contacts with ignition on: ~7V (which I understand is way low).
2. Removed ballast resistor. Now voltage between coil contacts is 10.6V, but the spark is still weak. When I cranked the engine voltage between coil contacts dropped to 5.5V(!!!).
3. Check coil resistance, which measured ~3.5 Ohm.
4. Replaced coil with a spare one (though I have no idea if it was good). Coil resistance is also about 3.5 Ohm, but no good spark.
5. Put original coil in and connected jumper wire between '+' coil terminal and battery cable on the starter solenoid. Wire from the ignition switch was disconnected. Still no good spark.
I would appreciate any advise on what else I could test or what is possibly wrong here. Can the coil be bad even if its resistance looks right? Its possible that both coils gone bad, but I kinda doubt it. Does it look like an issue with EI module?
Thank you in advance for any help and suggestions.
1. Checked voltage between coil contacts with ignition on: ~7V (which I understand is way low).
2. Removed ballast resistor. Now voltage between coil contacts is 10.6V, but the spark is still weak. When I cranked the engine voltage between coil contacts dropped to 5.5V(!!!).
3. Check coil resistance, which measured ~3.5 Ohm.
4. Replaced coil with a spare one (though I have no idea if it was good). Coil resistance is also about 3.5 Ohm, but no good spark.
5. Put original coil in and connected jumper wire between '+' coil terminal and battery cable on the starter solenoid. Wire from the ignition switch was disconnected. Still no good spark.
I would appreciate any advise on what else I could test or what is possibly wrong here. Can the coil be bad even if its resistance looks right? Its possible that both coils gone bad, but I kinda doubt it. Does it look like an issue with EI module?
Thank you in advance for any help and suggestions.
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