Good information. Did not know how to test a spark plug using a multimeter earlier.

I'm using AC Delco iridium.

I avoid Bosch platinum on American cars.

Hello

Good

You’re welcome.

do some research. this is not a good method at all. read some of the other replies here where they explain why this is wrong.

No you're thinking of your mom who uses a mule to get plowed

@@stephenlotto4364 🤣🤣🤣🤣

I’m glad you figured it out!

I’m glad you were able to get it fixed! Thanks for following along!

@Andries Viljoen my mk1 is burning a lot more fuel then it used to, any ideas what could be the cause(injected 1.6)

@@maharaj87 your O2 sensor has failed, telling the ECM to inject more fuel than it needs or a temp sensor is telling the ECM the engine is at -90°C

Thanks! I’m glad it helped!

Me too. This was fantastic although I chased everything else for the better part of two days during this time off from work. Oh well it kept off the streets and out trouble.

Swap them.over,easy .

What made you check?

😅😅😅

Sorry to say but,,,, the test is incomplete but fun to play with a multimeter. Think of your spark plug like the canary in a coal mine. It will let you know how things are going inside. Garden equipment is notorious for fouling from dirty oil and plugged air box and OLD ETHANOL GAS. add sea foam conditioner to stabilize your fuel . SO, look closely to the tip of the plug where it sparks. A black tip can be from no air flow causing a rich condition or too much fuel or lean is pure white from a vacuum leak likely a hose or carb is loose. Wet is not ...working at all or very little so ideally you want to see off white to very light grey. Oil fouling is obvious from the blue smoke if it runs. If the insulator is cracked and an issue it will back fire or misfire especially under a load . Visually you will see a crack line and feel a crack and see that carbon is in the crack from the arching to ground. USE YOUR MULTIMETER to test the resistance of your leads or plug wires too, if you don’t your test is incomplete. If it misfires under load the wire could be cracked and will be grounding under load. ZAP ZAP ! Take a good look by flexing the wire to open a crack. It will also have a carbon build up from arching to ground. Do a little brake stand in a vehicle or engage the drive on a mower to put a load on the engine warmed up no more than 30 seconds or you will damage your trans. If you have this condition do plugs first, then move on if it is still there and seek a pro for a second opinion. The helmet is a great idea especially if you are standing on wet ground or better yet leaning on a chrome wheel trim in your boxers if you are bare handing a wire. As a friend or neighbor to hold it while you crank it over. Clean some plugs on a small block 100k beauty or stant 6 sure, not a modern car please. The electrode tip where it makes a spark was much bigger, now smaller and fancy metal so it self cleans. Wire brushing or wire wheeling will scratch the porcelain and weaken it . It will look cleaner but won’t last very long like say 20 thousand miles stuff. So, leaving your oil change too long way past 50 % , which also means only 50% of your oil is kind of healthy right ? NO , NOPE , NOT AT ALL, HOT DIRTY OIL , ok I made my point, will not have any lubrications so you can feel it in your fingers. Off of your dipstick feel it compared to fresh. Like your toothpaste the grit is fine. Unlike toothpaste it has to work when it is so hot it will start to smoke dirty oil smokes inside and then stuff happens because it won’t lube the metal to metal anymore so bye bye timing gears and chain on your double overhead variable valve aluminum machine. Please remember what you promised to your mom to wear your helmet.🤠

Do you piss on an electric fence to see if it's working too? 😅😅😅😅😅😅😅😅😅

@@user-ei6zy3pv6h Wow, let's do business, are you in?

What would the OHM's be for an automobile plug ?

Any piece of metal with two ends, you're simply testing the integrity of the metal ore causing electrical "Resistance." A single wire strand 10 inches long, touch tester leads to each end (doesn't matter) of the wire strand in OHMS Measuring on your multimeter tool.

In the motorcycle workshop I worked in we had a machine that could supposedly test plugs. You could watch a plug on test sparking away merrily on the rig, yet back in the bike the misfire returned until we put a new set of NGKs in, and in many cases it was problem solved. We didn't have the time to sit and wonder why. You just go with what works when your pay packet depends on it.

@@timhancock6626 but one should know how it works.

Thank you!

Wish I had correct grammar.

Whished?

Great! I’m glad it worked for you!

I’m glad you found it helpful. Be sure to subscribe!

Thanks! Glad you had a good dad too!

Oldest trick in the book. Still a good one. The other was to charge a condenser, then toss it to the "new guy" saying "catch!" Yep, he gets 20,000 volts for a fraction of a second. And hates you. Until he pulls the same trick on the next new guy...

😀

👍

Well, I learned something! The 'megga-tester'......your regular VOM tester only puts out about 9 volts max. Megga testers can put out up to 1,000 volts. The higher voltage forces insulation resistance problems to show up faster.

It's Megger.

I made a bench top spark slug tester from an old CRT TV EHT circuit,

Make a video 🤠

DJ C444 You are welcome. I’m glad you found it helpful.

You could have damaged the white part.

old tester machines use to have a sandblaster cleaner section on the machine but they found that the grit left in the plug would be deposited into the cylinder....

@@blueplasma5589 No grit if ya clean em good

Glad it was helpful!

In most plugs! Finding non-resistor plugs can be a challenge sometimes.

It's always good to learn.

This test more shows bad spark plugs than identifies a 100% good one. It can’t stress test the plug.

@@TightWadDIY stress test is when it's under load,a multimeter can't do that.

@@TightWadDIY plug leads the same.

You cannot test spark plugs with a multimeter!

You must be a mechanic, as I have experience in this also. You are correct. However, few people have such access. He is using the meter most people would have to make a generalized assessment as to the plug being within the range of useful life.

Sounds like a *_Catch-22_* where you "test under load" while the engine is running, yet you cannot get the engine to start because the *_Spark Plug_* might be bad ? ...Or, do you take the *_spark plug_* out & put it into a known good engine ?

Is it any good testing something that works on over 1000volts with a 9vòlt multi meter /i don't think so/ how can you do a imsulation break down test with 9volts imposible /not posible joker

Good info, but air blow after wire cleaning is always best

i use a tiny blaster from harbor freight works like majic that is the only to clean the carbon from porcelain that is pathof least res. wire brush will not go down in there ir rinse after blasting just like new plug when i finish

Thanks! even tho i may not totally understand. - all info seen & read here, can't HtURT. : } TRUTH may HtURT sometimes, but LIES Always do. TRUTH Has Value some refuse to Invest.

you are 100% correct. this guy is giving bad advice. he does not know what is wrong with what he is doing.

spot on Fran , some people don't know what they don't know ..the test will only find a total failure , proper testing often needs to be done under operating conditions , to find intermittent faults or partial failure his requires an oscilloscope .

Interesting. I’ve never heard of that happening.

Not only can that happen on the plug but other ignition components such as the windings in a magneto.

That's not rely testing? Surely it should read that's not really testing!

But if the test done like shown and the continuity reads zero then the plug is defective regardless if it would somehow work by bridging over gaps using higher voltages.

Probably because they are testing for different problems. The test he performed checks for a bad resistor or other problem with the inner electrode. The other test checks for a conductivity between the inner and outer electrodes which shouldn't exist. Having a bad inner electrode doesn't mean testing the outer electrode will confirm the problem. Once he found the first problem, he stopped.

Thanks.

kind of far fetched the ground of a spark plug is where the threads are along with hook on the bottom when a plug fails its easyer for current to flow in the carbon to gd that jump a gap so no spark if you clean that dirty plug its good as new can remember last time i bought new plugs been cleaning with blaster for years

True but people generally do have a multimeter and not a oscilloscope

Agreed, a multimeter cannot test for HV breakdown which is how most sparkplugs fail.

@@karhukivi set your ohmeter on the highest ohm setting if you get a reading tiptop to bottom hook its carbon buildup on the post at bottom of plug you can clean that carbon out by by blasting plug is good as new been doing this for years

@@frankdavidson9675 Thanks!

Gotta use a plug cleaner/tester. They can test the plug's performance under pressure. Any aircraft repair shop has one. Bike shops used to, but most probably don't anymore.

Thanks.

i am 88 yrs old worked on engs a long time can not remember last i bought a new plug i just blast old dirty oily plugs to restore like new ( small blaster harbor freught sells works very good at 100 psi with fine media then rinse in a little gas to remove any media laying around the post------- i read this carbon path only on highest ohm scale try it next time

Yeah ser thats the problem with "mechanics" that only know to change things

@@manolomanoki9915 Our intelligence is revealed by the reasoning of our statements and spelling correctness or lack of.

Absolutely agree. No doubt this technique will find _some_ failures, but I’ve had a couple cases were the plugs will only fail hot. A mechanic friend of mine confirmed that this is not all that uncommon. Presumably, there can be some internal fractures that somehow open up - perhaps by being pulled apart by the expanding steel on the ends. Regardless, this test would be useless on them. Even in this economy, the hit to the wallet by a new plug is much preferred over a headache from a dodgy one.

@@frankdavidson9675 I usually hit fouled plugs with a bit of brake cleaner and a wire bush. A blaster does sound like an effective plan, if you have one available.

it a shame a company wastes the world's resources on something not fit for its purpose (not the first time i have heard bad things about champion)

That is the biggest load of horse shit ive ever heard. Now just for one minute here come back down to reality for me and have a think about this... If that were true, how would champion still be in business after all these years?

@@5150powder perhaps you need to re-read his comment? You obviously didn't understand what he said. What he stated is 100% correct!

@@GripFreak he got a bad batch. Thats all.

Champion were the word ,the main man in plugs Long time ago,NGK.no problem ever,never had a bad one,44 years in the industry, looking back,ring condensers and points were a pain always failing,cbs bounce causing ignition timing problems, connecting a timing light, the strobe would be erratic, old mini's.

Happy to hear you found it helpful.

I sure does.

Same thing

It's pretty much impossible to get a spark plug apart without destroying it, and therefore destroying evidence of the failure. Even cutting it in half would likely shatter the porcelain and the fragile center electrode.

@@livewire2759 Diamond saw.

@@deeeeeeps Do you have a diamond saw? I sure as hell don't. LOL

Glad it was helpful!

My pleasure!

I'm gonna disagree on the square edge gives a better spark. If that is correct, then about every racer from smoky yunick to Richard petty has been wrong. Electricity like air and water, flows easier across rounded edges, square edges cause turbulence and hot spots, which are both bad.

@@prestongodsey3567 when you buy a new spark plug the electrode has a nice sharp square edge on it, never heard of rounding the electrode off on purpose. I'm not so sure what Richard Petty does to his race car spark plugs but I know he doesnt enter any race with a lawnmower engine.

Power secrets by smoky yunick. There is an entry about preparing spark plugs. Also 20yrs of n2o foxbody mustangs + 35yrs of 2stroke bikes and quads has taught me plenty about plugs

Most often I can tell what fuel and how much of a spray is being used by looking at the plugs. They say 10k hrs to be a master, I'm a grand master of plugs at this point

Sadly EV's are making that knowledge redundant at an extremely quick pace.

lol

My pleasure!

Why did they make it a “1” and not an “8”??

@@mareksumguy1887 I'm just guessing - I think that the figure 8 is more obviously a specific number, whereas a I (as opposed to a 1) can be considered a symbol, rather than a number. Anyway, the convention is to use a I and have it understood that it represents ∞. Also, a 1 represented by I would probably have a decimal point associated with it to distinguish it from ∞. There could also be an additional pragmatic reason: I uses less battery power.

your statement is not correct the 1 on this meter simply means the reading is higher than the full scale (range) selected. If the meter is set to the 2kΩ range then any reading over 2,000 ohms will display the one. It does not mean infinity. This matters. If you are testing a 5kΩ spark plug and you put the meter on the 2kΩ range, it will display 1 - that does not mean the spark plug is bad (open), it means you are on too low of a range setting. On other meters, like a Fluke, it will display OL - for over limit of the range selected. Others will display the full scale limit - you have to know your meter

@@kenwittlief255 Interesting. Good explanation.

The 1 simply means that the measurement is over range or too high for the meter setting.

that's what makes it a bad video.

hit the nail on th head right up.

I too must correct him for posting video saying "in under one minute" but has 6:18 of video i didnt even watch it. Probably was entertaining.

yea he screwed the resistance thing up saying there should be no resistance when there should be high resistance .

You’re welcome!

Or is open

@@georgeiceman867 and open circuit and a circuit with infinite resistance are the same exact thing . this is a dumb ass video

you are right no resistance would read 0.0000 Ω

Well said ! Now I don't have to . Thanks. :-)

any meter reading on highest ohm setting is bad needs cleaning ----center elec. and gd should be infi.

Thanks!

Thanks! Glad you liked it!

There is a lot to learn about them. I don’t know everything. I learn new features as I need them.

3:34

Even better, 3:26 **lol**

@@citec123x Even even better, 3:24 - LOL

I’ve seen it many times. Mostly with champion plugs, even new out of the box. It’ll make you pull you’re hair out chasing an issue when you know you just replaced the plugs.

@@harryharry3193 seriously?

Glad you enjoyed it!