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The proper way is with a spark tester. A backyard mechanic way is to put a screwdriver in the spark plug boot and hold it close to the engine block, pull the starter rope and look for a spark from the screwdriver to the block. Doesn’t always work right and may not tell you for sure it isn’t working

How to Identify and Fix Common Gardening Problems ?

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To test a coil with a multimeter, you will need to connect the leads of the multimeter to the coil terminals. Once the connection is made, you can set the multimeter to the resistance mode and measure the resistance of the coil.
If you suspect the coil is dead, you can also remove the coil, plug it back in, and use an ignition spark tester like OEM 25069 to determine if the coil is firing. You can also use a multimeter to test resistance.
To diagnose a coil pack, set the multimeter to the 200 Ohms range, place the positive and negative probes on the identical terminals of a coil, and check the multimeter for a reading. A value between 0.3 ohms and 1.0 ohms means the coil is good, depending on the model.
Loss of spark is caused by anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. This includes worn, fouled or damaged spark plugs, bad plug wires or a cracked distributor cap.
Loss of spark is caused by anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. This includes worn, fouled or damaged spark plugs, bad plug wires or a cracked distributor cap.
A red or yellow spark is weak and probably will not spark in the cylinder. A blue or white spark is strong and has enough voltage to fight across the spark plug gap even under pressure within the cylinder.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

My chainsaw has no spark, I have checked the spark plug and it works on another unit, i guess it may be the ignition, ho0wever as it is a small coil I have no way of checking. can the coil be simply tested, otherwise can one be purcahsed.
ANSWER : Yes the coil can be tested. you would need to know the proper specs but with a multimeter you should be able to get a resistance value from your plug wire to ground. With my experience 10000 – 30000 ohms should allow it to run. If this is no help one common thing is your kill switch. A wire should run from the coil to the switch, if this wire is shorted to ground it will not run.

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Iginition coil test for sthil 044 – Stihl Chain Saw Handle Models 044 046 Ms440 Ms460
ANSWER : If it makes a blue spark, it’s probably good. More orange, probably too weak.

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I have no spark on my husqvarna 240 chainsaw i have tried disconecting the kill switch and fiting a new spark plug but still no spark
ANSWER : Sounds like an ignition module/coil problem.

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Test ignition coil honda gx25
ANSWER : Okay. You have eliminated the plug. Now disconnect the coil kill wire and try for spark again. Also check grounding between the coil laminates and the cylinder with you ohm meter should read zero.

If grounding okay and with the kill wire disconnected you still get no sparks then replace the coil pack as it probably a failed internal trigger which can not tested for.

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What are the symptoms of a bad coil on my Poulan chainsaw? Mine only sparks at high RPM’s, as tested with my electic drill motor spinning the engine and grounding the removed spark plug to the engine head. I don’t want to buy a new coil if that may not be the problem. I’ve already checked the kill switch wiring and the high tension spark plug wire itself, as well as trying several different plugs.
Thanks! -Rob
ANSWER : There has to be a reasonable spark at hand cranking speed, with most electronic ignitions they work off speed of rotation so you do need to crank the engine at a fair speed, check the air gap between the flywheel magnet and the ignition core, this should be around 0.3mm, if there is not spark at all when cranked well it will be a replacement unit required.

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What is the spark plug gap for a ryobi string trimmer model # ry30550 ?
ANSWER : I can’t say for sure, but it’s PROBABLY about 0.035″.

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How to test engine coil on 19 hp kohler engine
ANSWER : Get yourself a test spark plug for small engines

There is a small engine one & one for car with HEI

Looks like a spark plug with an alligator clip on it

Look on the internet for one similar to KD 2757

Has to be for small engine & std ignition– not electronic
ignition systems

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How to replace ignition coil on asthil 029
ANSWER : Coil should be held on the saw with 2 torx t27 size screws. These will resemble a star. Remove the 2 screws, lift out the coil. The small wire should be attached with a spade connector, slide the spade off with needle nose pliers. Disconnect the spark plug wire from the spark plug, & thread it out of the saw as you remove the coil. Assembly is reverse order of removal. For clearance, loosen coil screws, alike coil away from flywheel

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