What should the resistance be on a GM ignition coil?
Place one test lead from the ohms meter on the negative post and one on the positive post of the coil. it doesn’t matter which lead goes on which post because you are measuring resistance, not amps or volts. The reading should be between .70 and 1.7 ohms.
What are the differences between PCM and coil on plug ignition?
PCM controlled ground (dwell) 2 wire coils Ignition coil dwell done by PCM Offers more available tests 2 wire coils Direct access to coil primary allows for measurement of primary resistance 2 wire coils Some coils allow for measurement of secondary resistance 2 wire coils Many coils place a diode between the primary and
What does K ohms mean on ignition coil?
If the readings in your post are accurate, you have at least one coil within the specification, (1.2 is within range) but the readings you report on the pickup coil don’t make any sense. “k-ohms” means “thousand-ohms”.
How to test ignition coil pack ignition plug?
Do not use a regular spark plug instead of a spark tester to test for spark. Do not remove the spark plug wire from the spark plug or the ignition coil while the engine is cranking to test for spark. Start your diagnostic from TEST 1, do not skip around from test to test unless instructed to do so by the TEST you are currently on.
How to test primary resistance of ignition coil?
To test the primary resistance on the coil, grab a multimeter and attach the positive probe to the positive terminal on the coil. Then, attach the negative probe to the negative terminal. Set the multimeter to 200 ohms in the resistance category and take the reading. Typically, the primary resistance should be somewhere between 0.4-2 ohms.
How many ohms do ignition coils need to be?
These are the 12 volt coils used on the older pre-1971 bikes Minimum 3.3 ohms Maximum 3.8 ohms When you move to electronic ignition, it is important to note that the manufacturers are very particular about the resistance of the primary windings of the ignition coils that you fit.
How does the PCM monitor the ignition coils?
This includes fuel injectors and ignition coils. The PCM monitors the fuel injectors by looking for open or short circuits. It monitors the ignition coils by monitoring the current in each primary circuit to see if it rises to the correct level and then falls again in response to the firing command.
What kind of resistor do I need for hotspark ignition coil?
It’s best to check the coil’s primary resistance with an Ohmmeter (a digital multi meter in the 200 Ω mode). Install a 1.4 Ω or so external ballast resistor ( HS14BR) between the coil’s + terminal and the red HotSpark ignition module’s red wire, if the coil’s primary resistance is questionable or borderline.