That is probably the most accurate thing I have ever heard. "If your tuner does not check the plugs, he is NOT a tuner he is a computer guy" .

Literally been looking for a good explanation on how to read plugs for years. Finally found it. Thank you 🙏

Saving. I asked a tuner how to read plugs, he did not understand my question. Thanks for the great video.

By far the best and most useful short description of reading a spark plug I have encountered. Thank you.

Thank you Stev. For the refreshing my mind. It’s great that you have made these videos to help people learn. Cain hard guys.

This is by far the best information on spark plug reading I have ever seen. Thank you so much Steve.

this is THE best tip Ive ever heard on reading spark plugs! thank you!

This makes more sense to me than all of the other information I found. Thank you!

Awesome video man thank you for your help. I have been a gear head for years building cars but just now getting into refining my toon and this is a huge help.

I should have known Steve would have the best explanation on reading plugs

Pisses me off knowing how much i would have picked up at the track knowing this. Was always told wrong on where timing mark should be on ground strap. Best video ive seen

Your video is one of the most clear and concise, when it comes to explaining this. I pulled my plugs this afternoon to check my freshly built, boosted motor, and your tutorial helped immensely. I was worried that I had too much timing, and you helped resolve that. Thank you sir.

Finally a video about reading plugs that doesn't leave me more confused. TY! great info.

Might just be one of the better sparkplug reader vids I've seen. Thanks. Subb.................

Thank you, I have watched and researched many plug Vids this one is by far the most informal and straight forward I actually understood, Iam new to reading and tuning my car but I am getting it.

Steve, thank you so much for sharing such valuable information, it's very kind of you!

This is hands down the best explanation ever!

Wow, that was probably the best video I’ve seen on KZfaq. Keeps it simple while still giving a thorough explanation of what to look for and why. The thing I probably appreciate most is that there are no gimmicks. He’s not trying to be a damn comedian or talk show host like a lot of these other clowns that put out instructional videos. I sincerely thank you for sharing that with us.

Best video I have seen on the net. This is exactly the info I was looking for. Thx Steve.

The best spark plug video I’ve ever seen! So helpful.

Appreciate you taking the time to do these videos Steve. You’re a busy dude but sharing your wealth of experience is hugely appreciated by us average weekend warriors! This was super-helpful!

Steve you really know your shit and your products show it.

Steve dig all your videos very educational thanks for doing them..i learn something off each one you do...

Priceless knowledge!!!! You guys need to get your engine parts section fixed on your website. I'm strongly thinking of finally getting around to my Nova. It's been too long and I really need the stress relief and my sons want to see the project started again. Thanks for the info!

Great video, thanks for sharing this. Sums up reading plugs excellently !!

Thanks Steve! was looking for this and this is the only one I found that explains this perfectly. So much thanks. Going through timing atm on my LY6 and will be pulling plugs after a straight I know with no one around :)

Best plug reading explanation ever. Thanks Steve.

Love all your videos absolutely spot on man love learning from all your knowledge you share with us!

On point Steve, thank you for posting this, all too many people ignore this very basic tuning tool, another is looking in the exhaust pipe outlet(s) along with the plugs these two seemingly mundane items do get overlooked in favor of as you pointed out "instrumentation". Just as a side note, spark plug reading can be skewed if the wrong heat range is chosen thereby masking what is really happening, my experience is most people use way too cold of a plug somehow thinking it will gain something when in reality you need to use the hottest plug possible (without blistering the strap or porcelain) to actually arrive at plug readings that do reflect the tuning of the fuel/timing combination.

Best video I’ve ever seen on spark plugs !

Simple and straight to the point,thank you

Fantastic info Steve, your videos are awesome 👏

Nice video- thanks for taking the time to make it-Jerry

Awesome video! Spark plug reading FINALLY made simple!

Another great informational video Steve 👍

Wow i was always wondering and now i know. Awsome work

Had to watch this video again great info thanks Steve🙏

Very informational,once again... ty Steve!!!

Wonderful video! Thanks for the tech tip

Never thought to cut open a spark plug. I've been schooled. 😮

Great explanation. Good video. When I get ready to tuna fish I'm calling you. 👍😁

Phenominal video/information. Thank you.

Excellent video! Great info…thank you sir

Awesome explanation on straptech!

Great video Steve very informative mate 👍

One of your best videos

Excellent tips and tricks video.

Good advice, I think a more indepth would be beneficial for all. Lean, ritch, good. Thanks for the video

Good tips. I'm going to pull my plugs now.

Outstanding video. Thank you.

Best yet no music or bs Thank you😊😊

Very informative thanks for the explanation.

Steve thanks you’re a great teacher

And my video suggestion is carb tuning,,,,jets, bleeds, emulsion etc,,,would love to hear from guy like you

DIY - Instead of a lathe, put the plug in a vise. Use a 5/8 holesaw to cut the crimp off the top of the plug base and slide the porcelain out.

Learn something new every day.

Omg, thanks a lot 🤝 very good explanation

If one places new spark plugs in a four cylinder car, how many miles of driving would it be good to pull a spark plug out to be able to read what a spark plug is telling us about the engine condition? Thank you for this video. Its one of the best ones.

If I woulda known you were gonna give all this information away for free on KZfaq I would have waited instead of buying all your videos back in 14

Thanks for the video You ROCK

Great one. Thank you very much..

"Pig fat rich" 😅😅 Love this stuff! Wish I could see one for M1 fuel😎

GREAT video Steve !! Just found this channel by accident, subbed !

Great info Steve.

Oi Steve u r the god of info brother thx for the insight 🤙🏽🤙🏽

Thanks for the lesson!

Thx for the great information!

Good stuff Steve

Awesome! Thank you! Just finished pushing my chopper home 2 miles in the blasting sun because I am a idiot and forgot to read my plugs.

Great shout thanks

Thank you for sharing.

thanks, i'm not a mechanic or do anything with cars but i enjoyed the info

Thank you for posting

Good spark plug reading tools. Trying to find a good one

Great video!!!

My color mark on the strap is just past the bend...before it was right above the base thread which is where you show the "sweat spot"....my question is this...do we change the curve or just the total timing figure. MSD distributor so its easy to switch out springs....i can add back the 2° only and look at the strap again...fyi its 22° base 10° bushing in the distributor.... I pulled 2° of initial and back to 2 heavy springs which moved the color line on the bend of the strap.

Thanks for share man! Hoh many time a new or very clean spark plug need to be under combustion to catch enough deposits for spark plug reading? How many time combustion for partial throttle openings and how many time for WOT and cut thread? Thanks to you!

Steve i have a 406ci sbc street car and i was wonder why plug 1 doesn't show a burn on the strap while plug 7 shows burn in the middle of the top of the strap. What would cause this difference?

Awesome , thanks steve..

Thanks for the lathe idea 💡!

Best Video to understand timing & fuel

Great Video! On a normal street car how to you recommend running the car before pulling the plugs to check? Take it out and run a 1/4 mile, then drive it home (3-5 miles or so) and check? or Take it out and run it 1/8-1/4, shut it off as soon as possible and check plugs on side of road? I know at a track or event it is easy, but it is always hard to have access to that.

Hey Steve, great video!!! Does this apply to all combustion applications? How about 2 strokes? Thank you.

Curious to know what you think about exhaust valve colouring etc

If been reading my plugs this way for over 40 years. I look for a ring of color at the base of the porcelain. It’s very ez to see on a very cold plug since the porcelain is right at the top but it still needs to be there. The ground strap as he stated and the the 2 top threads will direct you to the timing. Those threads were really coked up indicating rich. On that engine it’s easier to adjust the timing 2 degrees versus changing jets (bypass) if I was a clean shutoff.

You are the man !

Steve do you start with the recommended spark plugs from the cylinder head manufacturer and how do you know if you are starting to hot? Great videos.

Best explanation ever

Thank you Steave.

Can you tell me what the gape set is on spark plugs 2010 Chevy Malibu 2.4

Excellent job absolutely excellent

found you on cleedus's page. i love your videos super helpful

Great video.....I'm trying to street tune a ford 289 with a 600cfm holley carb for wide open throttle....I've tried it once and had a good timing mark but no fuel reading on the porcelain....I was only at WOT for about 10 seconds...is this enough time to get a fuel reading......or am I just to lean......thanks

Do you have to adjust timing and air fuel ratio together to properly read the plugs? Do these two adjustments feed off each other as your making adjustments?

Steve... thanks for a cogent description of plug "reading". Question... how long do new plugs have to run in the engine for the "reading" to be representative of the combustion process?

Had to subscribe to this one! I have one plug that has white insulator(very white, like new). I swapped it to aother cylinder and after 20 miles or so it was still white. all the rest are white with faint brown/tan markings. I also did compression test and I have 152-168 on all 6(that's with brand new heads). Technically that is too much compression difference(more than 14) but it would not explain my mysterious white plug! Also tested all plugs in plug tester and all passed with great spark.

Would a hotter or colder plug show a different read on same tune up?

Since normal idling pollutes and contaminates the porcelain, (as you said), how useful is this test for the average joe and his daily driver? Is your advice more geared towards track cars?

Great Job, Ty.

Nice! How do you tell if you need a hotter or colder plug?