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How do I test ignition coil for spark from onan 4000 generator

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  • cheryl hargrave
    cheryl hargrave Apr 04, 2015

    How do I know if an ignition coil is working correctly as I am not getting a spark at the spark plugs. I have replaced the spark plugs and the high tension wires.


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Posted on Apr 04, 2015

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My onan 4.0 grenerator motor will not idle and it is back fireing while trying to run is in the valves

If it is backfiring even during idle, there are a couple of possible issues. Check the obvious and least expensive first. Make sure you have correct OEM spark plugs, check ignition wires. Then check the ignition coil and trigger module, there is a procedure for doing that in the Cummins Onan manual. A manual can be obtained from or local Onan RV dealer. This will give you the ignition coil resistance and the ignition module resistance. Also has anyone messed around with the carb, or has it sat for long periods, too lean a fuel mixture can cause backfiring. Good Luck ;)

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If you are sure all the correct switches are thrown to start this unit, than you need to turn your attention towards the coil. It might be toasted and need to be replaced. Make sure all connections are good before replacing. Good Luck...

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The reason can be:
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