2007 Nissan Versa DOHC Replaced all 4 spark plugs about 10K miles ago, premium NGK iridium type. Cylinder #2 spark plug center electrode (sparking tip) worn to nothing already (no visible tip of electrode), and bench tests no connectivity thru core (infinite resistance). All other three have some …

The PCM monitors the coil performance, that includes power and grounding. The computer monitors the cylinders for detonation and controls the spark advance accordingly. Everything is done for you, your job: don’t drop the spark plugs.

[image] George_San_Jose1: The coil needs a ground too. I expect it gets the ground via its electrical connector. Check that coil’s connector pins for corrosion, etc. Good info and idea. Just went to check continuity on ground (center pin) of each connector-- all good to engine block. The thre…

[image] Nevada_545: The PCM monitors the coil performance, that includes power and grounding. The computer monitors the cylinders for detonation and controls the spark advance accordingly. Everything is done for you, your job: don’t drop the spark plugs. That sounds good to me. I’ll treat the…

Just another thought. You sai you were ordering them. There are knock off fake parts that look identical to the real thing. If you order, I would only order from some place like rock auto to be sure getting genuine parts. Some years ago an old parts guy at the auto parts place, told me that it s…

I’m curious as to where you bought the plugs from?? I am also assuming the engine started misfiring and or the CEL came on is why you removed all the plugs after 10K miles(?)… M money would be on a dropped spark plug at some point between the manufacturing machine and your cylinder head…

Yep, I suppose a dropped one might be an explanation. Can’t say where I ordered them (it’s been a couple years) but I remember they came in nice Japanese boxes.

Anyway to post a picture of the damaged spark plug??

There are counterfeit, high dollar spark plugs out there.

[image] davesmopar: I’m curious as to where you bought the plugs from?? My first thought too. Lots of phonies on Ebay and Amazon.

[image] Ray-O_Vac: continuity on ground (center pin) of each connector-- all good to engine block. The three pins on each coil all look bright and shiny too. Would you recommend cleaning those connectors/pins now that I’ve got things open? A spray or electronic parts cleaner? Would just a spray …

Premature wear of one spark plug electrode

Maintenance/Repairs

George_San_Jose1 May 22, 2023, 10:29pm 16

Nothing needs to be done imo. Based on your report, I don’t think your problem is related to the coils.

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Premature wear of one spark plug electrode

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