OriGlam Spark Plug Tester, Adjustable Ignition System Coil Tester, Coil-on Plug Ignition Spark Circuit Tester, Autos Diagnostic Test Tool

Goodness, some of the information in here is maddening! NO! The numbers on this device have nothing to do with what your gap is supposed to be on your spark plugs! This tool is specifically to measure how much voltage (kilovolts) that is being discharged from your motor's ignition coil. And why do we care? Well, remember our grandfathers teaching us how to figure out why that old Bolens lawnmower won't start? "Well, here boy hold these insulated nippers so that plug right there is up against the block. Now don't move it." (Old man yanks the starter cord) "Yeppers see that boy we got spark we're good let's put that there plug back in!" Ugh. There's a reason why the manufacturers of our motors specify a 20,000 volt, 30,000 volt or 40,000 volt coil for our motors. Our spark plugs need that voltage to make a brilliant blue, gonna-give-ya-nightmares SNAPPING spark in order to fire the fuel vapors in the combustion chamber. So no, that whole, "Yep I got spark" thing is applesauce. Take a look at the photo I attached. Unplug the boot from 1) the distributor cap from your coil (old classics) and plug that over the gold terminal on the tester, or 2) the boot that was over each spark plug, and plug each over the gold terminal for individual tests. And ground the alligator clip. Now, what voltage is your coil rated for? If you don't know, look it up. Once you know, set the ground needle of the tester to the line as shown in my photo. Small Engines (SE) are normally like lawnmowers or chainsaws. For number 1 above, you'll be just cranking the engine. Hopefully you have a remote starter button so you can throw voltage at your starter relay to crank over the engine. If not, have someone else crank the engine from inside the cab while you watch the arc. (or what you hope is the arc) Once it's cranking, are you seeing the "lightning bolt of life" between the points? WOOT! Your coil is good! If not, stop cranking the engine and turn the dial clockwise so the needle moves about 1/4 inch. Crank it. See an arc? Continue until you do. You can gauge what your coil is actually putting out. If the arc does not align with the needle and voltage specs from your col it's not giving the voltage your spark plugs need to make your ignition work properly. Now if your coil is good, you can go to number 2. Now we see if we are getting that same arc from the spark plug boot. If not, your spark plug cable is bad. Probably the best ignition testing tool as a starting point for hard starts. Once you know you have "proper" spark, you'll go to compression (air) and fuel (carb or EFI) and diagnose those.

This works really good, add to your toolbox.

I recently picked up the OriGlam Spark Plug Tester, and it's proven to be quite the handy diagnostic tool in my garage. As a car enthusiast who enjoys tinkering with my vehicles, this tool has been a great addition to my toolbox. It's straightforward to use and has helped me quickly identify ignition issues in my cars.The adjustable feature makes it compatible with various types of ignition systems, and the ease of connecting it to the spark plug wires is a real time-saver. The tester has a clear and visible indicator, making it easy to see if there's a spark or not. I've used it on both older and newer cars in my collection, and it has consistently delivered accurate results. My only reason for not giving it a full 5 stars is that the build quality feels a bit on the lightweight side, but for the price, it's definitely a valuable tool to have around. Overall, the OriGlam Spark Plug Tester is a practical and affordable addition for DIY mechanics like me, and I'm pleased with its performance. It's a solid 4 out of 5 stars from me!

Not fancy but I wish I had one a lot sooner. If you do a lot of chinese 4 wheelers you need this. They are very bad with ignition quality. Instead of just knowing yes or no you can get an idea of the power.

Been having electrical issues and needed to test spark plugs but didn't have anyone to help me. Got this device overnight and it worked perfectly and answered all my questions about getting spark to sparkplugs. Great device and having the long grounding cord allowed me to hook it up and see the results from the front seat of the car thru the windshield. Highly recommend and cost effective.

I saw one of these used in a youtube video and it seemed helpful; but I didn't have any luck with it. I was working on a riding mower in early afternoon in June, so it was pretty bright outside. I couldn't see the spark using this tool, but I may have had the gap too large. I used a grounded spark plug instead and it worked.

Easy to use and adjustable to determine spark strength

Need to set your marine outboard motor timing? You can set your timing without running your motor.