r/stihl • u/robertking1991 • 2d ago

Coil help. Anyone?

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Hi all. Got a 460 that won’t start or give me a spark. I’m getting 1.8 across the plug and the earth circuit seems to be okay. Anyone know if this is enough? My 131 generates 1.6 and works fine. Starting to pull my hair out! Cheers

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u/iscashstillking 1d ago

This is an mTronic machine right?

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u/robertking1991 1d ago

Yeh. Has made the diagnosing tricky with my limited knowledge

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u/iscashstillking 1d ago

So this machine does not have an 'ignition module' proper, it has a control unit and that's why it costs $170.

There are also two revisions to said control unit; to get the right part number have your serial handy when you call the dealer.

As far as troubleshooting a no spark condition, the best you can do for right now is make sure the kill switch isn't actively killing things even when you don't want it to, i.e. make sure the switch and wiring are not shorted somewhere along the path. If that doesn't give you a clue then I would take it to the dealer and have them hook it up to the computer and see if the ignition module is alive or not.

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u/robertking1991 1d ago

Ahhhh okay, brilliant. I’ll do that and see what we get. Many thanks!!