How to Gap Iridium spark plugs

In this video we dive into how to properly gap Iridium spark plugs and go over a few tools to do the job. Gapping these plugs is often done incorrectly leading to failure rather quickly. We hope this video helps solve this issue and save you a few $$.

Related Links:

Wire Gapping tool

Torque Solution Precision Spark Plug Gap Tool for 12mm Threaded Spark Plugs

Torque Solution Precision Spark Plug Gap Tool for 14mm Threaded Spark Plugs

KD Tool GearWrench 164 12 Blade Feeler Gauge Set & 6 Wire Spark Plug Gap

HKS M-Series Spark Plugs

Ngk Race plugs

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[anthonypojung]

You know you use the hole on the disc gap tool to open the gap. It's is a perfectly fine tool.

[powderriver]

Very helpful and informative, and as I figured, the tips shown are the basic ways I was taught 45 years ago from my father gapping plugs. Moreover replacing my first set of modern plugs I sensed right away the delicate nature of the the electrode, and thanks to this video confirmed the methods I use to gap plugs is correct. There are many videos this one was the better video in my opinion simple and to the point.

[ryandeweese]

Dig the video for sure, but you dont "wedge" the gap open on the outside measuring the "hole for the key ring" actually has a ledge inside that is where you place the grounding bar to open it up...amatures "wedge open" from the outside measuring side lol!!
No hate though fella!! Excellent vid!! Keep up the good work!!

[PedramBastan]

I think you just opened my eyes. Glad I watched this video. I'll try not to use the Auto zone Chinese tool anymore. Noted.

[MrRockydee]

Great video, I just got a Lang 4550A ramp gauge tool with a built-in electrode bender. Also, that tool to bend the electrodes down is nice, but I've always used feeler gauges and cleaned them off first, then used a dial calculator to check the blades.

[worshipwhilewewait]

That "quarter-looking" dial gapper I got from AZ was OFF by 3. Used two different micrometers and both said "OFF BY 3!" Decided I'd try and install - BIG MISTAKE. Misfire haven. Hubby said use the feeler gauges. Car now runs much better.

[hrespeto]

Thank you guys for this. Super helpful

[Utsusemi]

how do we gap the slanted tip spark plugs? i know the NGK R2556G-8 has a slanted tip

[mitchp]

Great video, straight to all the important points.

[intrusive_thoughts.]

How often should the gap be checked on a (hard driven) daily driver, and also how many times can a spark plug be adjusted safely before the electrode becomes dangerously weakened? Thank you for your work in compiling these videos and for sharing your knowledge.

[chrisclosas]

Can Racing spark plugs be gapped such as Denso (5749) IKH01-24? The ground strap on these is different and much thinner.

[BPattB]

Thank you very helpful, I do have a question. If you can help me with it I'd be very grateful. Denso makes three iridium spark plugs for my vehicle two of the gaps are.044 and the one I bought is .040. The OEM plugs are one of the .044's. should I run the ones I bought at .040 like denso lists or gap them to .044? The motors is not modified at all.

[kappaross]

So when you're using the feeler gauge are u slightly touching the electrode then?

[Funrunner]

I'm getting some dual electrode denso plugs and am worried about gapping them, any advice?

[bobitwhite]

the round plug gaper the hole in the tool is the adjuster that adjusts the gap ! the grd. electrode is bent up never pried up by the ramped gauge LOOK at the tool ive used them all they all work great I don't mind taping the electrode to close the gap . what you pay for the red tool ? not bad but a tap tap is not bad also

[waynesitarz]

My flat feeler gauge set for 0.043 gives perfect 0.044 checked with wire gauge tool 0.044 and 0.045 (too big)

[HighGrade_FireBlade]

With the coin gapper you don’t just shove the ramp into the plug gap to open it up. It’s just used to measure the gap. You use the small “key ring” hole to open the gap which puts no pressure on the electrode. Still not the best for fine electrode plugs such as platinum, iridium, or ruthenium, but if used properly they are not complete trash.

[clinthightowerclinthightow]

Great video, I learned not to get this configuration but get the type where you lay the plug in it and don't have to screw the plugs in and out over and over WTH :o

[clinthightowerclinthightow]

You need to check the gap with the pressure of the tool off of the electrode because the electrode springs back a little when you back off the knob.

[josecuevas]

you were right, the bridge is called a strap, ground strap.