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Old 08-29-2016, 07:22 PM   #1
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Testing Ingition Module - How?


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I am relatively new to gasoline model aircraft engines. I have a stock DLE 35 RA mounted in an R/C Guys Decathlon and I suspect that my ignition module may be faulty. The ignition module is a DLE, Model A-02, 4.8-8.4 volts. How do I test the module to check it's serviceability?

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Old 08-29-2016, 07:48 PM   #2
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Re: Testing Ingition Module - How?

I had ignition issues also on a DA100 and this is the only way I know to check it. Take the spark plug out of the engine and put it in the spark plug boot. Power the ignition up and hold the spark plug against the engine. Flip the prop over rapidly and you should see a spark
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Old 08-29-2016, 08:16 PM   #3
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Re: Testing Ingition Module - How?

Hi Mike:

Do you mean to hold the electrode right against the engine (cylinder)? Touching?

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Old 08-29-2016, 08:26 PM   #4
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Re: Testing Ingition Module - How?

Peter - just touch the plug threads to the cylinder - simulates being screwed in but of course it is not. Best in a darkened or well shaded environment. Some sparks are hard to see but you may also hear them. Don't flip the engine over with no plug in the boot or that can damage the ignition.
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Old 08-30-2016, 12:24 AM   #5
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Re: Testing Ingition Module - How?

Mike and Bill:

Thanks for your suggestions. I pulled the plug, energized the ignition and did the test as you recommended and it worked. I was able to determine that the ignition did function and that both the mechanical and optical switches worked and that the wiring was sound.

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Old 08-30-2016, 08:03 AM   #6
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Re: Testing Ingition Module - How?

Glad to hear
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Old 08-30-2016, 10:40 AM   #7
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Re: Testing Ingition Module - How?

If you're Motor is mounted inverted, it will flood easy. It can cause confusion.
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Old 08-30-2016, 12:34 PM   #8
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Re: Testing Ingition Module - How?

On the Dle the plug does not have to be grounded to test for spark. The wire carries both positive and negative charge.
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Old 08-30-2016, 02:59 PM   #9
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Re: Testing Ingition Module - How?

So; now that you KNOW that the Ignition Module is good...

I would suggest that you squirt a few drops of gas into the cylinder head, replace the Spark plug and wiring then flip the prop.

If it fires up - you have a fuel issue.

Good Luck!
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Old 09-21-2016, 12:39 AM   #10
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Re: Testing Ingition Module - How?

As stated by chevpro no need to hold the plug against the engine. The outer shielding is the ground path.

Never test without a plug in the cap, can harm the ignition. Keep one DLE plug for testing. You can then use vice grips on the threads to get it out of the boot, we all know how tough it is to get the boot off the plug with the plug screwed into the engine, out of the engine is near impossible.
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