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

I've never used one of these before but needed one to test the spark on a motorcycle. I must say it worked like a charm, easy to use and you could see the spark clearly. Looks to be well made.

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.

Short review: works as expected, nice quality piece for what it is, allows you to adjust the gap to see how strong your spark is, and what color it is (easy to see against black background) Long review: I've been doing a LOT of side work on small engines lately (chainsaws, lawn mowers, etc.) I started with one of the light up testers and quickly realized how useless they are. The slightest thing makes them light, even if it won't "light" a spark plug. Got tired of trying to do the whole, hold the plug against the cylinder head and pull the engine over enough to get a spark, while not getting shocked and trying to make out the spark color. I didn't want to spend a fortune however on some of the more expensive testers like this one - enter this lil guy. First impressions were good. Heavy piece, nice cable and clamp, brass adjustment screw, definitely solid enough to withstand a less than gracious environment (my garage). The flat black background makes it easy to see the spark (blue, yellow, whatever), and the markings are nice to get a consistent feel for spark gap. Cons: As others have noted, the fit of the brass screw is loose. You kinda want this solid so the gap isn't fluctuating all over while trying use it. I ended up basically marring the threads on the brass screw to make it stay where I wanted it. I may revisit and try to use some aluminum foil or even a piece of soda can to tighten it up. This is my biggest gripe with this. The only other con I have is the markings - you sort of have to decipher, along with the "decoder" on the back of the packaging, what exactly they mean. I threw out the packaging after a couple times and just use the markings as generic reference points now. After a few uses, you get a feel for what's good, bad or in between. So given the two cons, one star off. Otherwise, great little tool for basic diagnostics.

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.

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.

Perfect for what I needed. I'm able to test automotive coils easily. The adjustment knob is a bit sloppy in its fit but easily fixed by adding a small spring under the knob to keep the adjustment secure. Awesome bargain! Video shows spark operation at a simulated 6000 RPM.

Works but I can't believe how bad the alligator clip is. Bent the first use. A must have when working on small engines. Too bad they cheaped out on the clip.

This works really good, add to your toolbox.