Spark plug help? ::: Solved

Swapped coils, no change. Looking for a new plug now. Silver lining is that it’s cylinder #5. The way my luck goes it should have been cylinder #6.

 

Hope it gets warrantied out

 

I wouldn't thank my lucky stars just yet.
If that doesn't fix it, you're probably looking at a head gasket.

 

$10, not terribly worried. Lol

 

The gap on the new plugs looks off compared to the old one. Have you tried closing the gap a little on the new plug so there is a closer spark. I bet its the plug.

 

I noticed this as well. I confirmed the gap on the new plug. I’ll check the spec again. I checked the gap on all six before installing.

FWIW, the drive in this morning produced zero misfires on the old plug. Waiting for my 6/10 delivery of a new plug. I guess I could have checked the dealer inventory.

 

Where did you buy the spark plugs?

 

I seen post where plugs were bought yeah after all that trouble shooting I definitely would have bought a new one

 

From what you're describing you have a new plug that is bad. Buy another one and swap it,if the coil worked for the old plug and not the new chances it's the coil are almost nil. Sometimes plugs are just bad. Good luck. Make sure your coil connections are all good,did that once.

 

I could be wrong here, but I believe the iridium plugs are coated with iridium and the electrodes are not made of iridium. So, gapping would tend to affect the coating. I would not gap multi electrode plugs.

 

If it wasn’t having any misfires ever, right up until the moment he changed the plugs, it ain’t a head gasket. If it runs fine with the old plug back in hole 5, it’s the plug. /

 

If I remember correctly I've serviced my plugs 3 times in 160k mi . My last service my plugs looked great . I'll be servicing them soon probably 185k mi.

 

this is a cool thread. Love the suggestions to slowly deduce the issue. Exactly what this forum is great for.

 

Yep, lots of good advice. So far, the consensus is: new plug bad, old plug good.

I’ll swap out with the new one this weekend assuming it arrives in time. If I get crazy impatient, I’ll stop by the dealership on the way home one day.

I hadn’t thought about coatings and how gapping might affect them. I guess it depends on your technique. I’m wondering how strong the coating is now. I’m assuming it was coated with electrolysis in a vacuum. Anodizing might not be strong enough to withstand the constant arcing.

 

Ya most likely the box was dropped in the parts store or during shipping and the insulator has a microfracture. Its happened to me before.

 

Autozone home delivery because a) free delivery and b) not available for in store pickup. Go figure.

 

I took a chance on Amazon and they were legit.

 

Well, my replacement plug arrived in the mail a few days early. Pulled the old-old plug out and put in the new-new plug. No misfires at idle for 3 minute. I’m not going through the trouble of putting the old-new plug back in to test the conclusion that I got a bad plug in my original six.

Thanks everyone for the contributions.

 

awesome! This is good information for us to all have.

 

Great news!