Concerning discovery after changing spark plugs (pics)

Concerning discovery after changing my plugs. 68k 2016

Ideas as to what might be going on?

 

Spark plug might have been been loose and that’s dried burned oil. ?

 

They all seemed snug, but I thought that as well.. seems logical.

I made sure to snug them up well when installing the new ones.

 

Loose plug and some blow by gasses. It’s been seen a lot.

 

Thank you. That is what I was thinking.

 

IMO, appears to be more cooked oil at the top, than near the plug end. Maybe the rubber gasket (between the tube and the valve cover) was letting a small amount of oil by, and it was cooking fast to your coil extension. The heat and cold will make some moisture in the tube as well. Everything looks dry in the photos, so I would not think there is much of anything inside the tube to worry about - check that tubes rubber gasket for a cut or nick?

 

They all looked good, other then the blow back looking smug....

It seems after more investigating, it is indeed blow back from slightly loose plugs. I made sure to snug them up good when installing the new ones.... The passenger side is very easy to get to , so after some time I will pull the middle plug on teh passenger side and see what it looks like

 

STD.....?
JK , you do a lot of deep water crossing? If its oil it should smell petroleum based even though it's burnt. Could be the cooked off remains from from some muddy water crossing.

 

This is more like it.

 

https://www.ebay.com/itm/203637620818?epid=1438091589

 

No water crossings.

Im going to pul the passenger side plug in a few months and see how the plug looks compared to the old one. If it seems good, then I think it was a slightly loose plug. They did seem easy to come out... I snugged them up well, but I need to get a torque wrench for when I check them again

 

Don't "snug up well". Use a torque wrench! Both for the thread stretch and for proper gasket seating.
Too tight can be just as detrimental as too loose (and sometimes worse).

 

Ya, i know.. but I did not have one at the time that has 13 foot pounds... I need to find a decent one, but not sure what one to get...

 

Didn't see this post until after I posted. Well Done!

 

Can you recommend a decent torque wrench?

 

Folx in the Harbor Freight tool thread say all torque wrenches available there are quite accurate. You could do a quick search through the thread for specific comments. I think someone also shared a YouTube review validating the readout.

 

I will look for this harbor freight thread, thanks

 

I'd suggest a Proto one.

My dad had bought a Proto one in 1968. Gave it to me in 1989 when I worked as an A&P for a major airline. The airline required personal tools to be calibrated (just as they did the issued tools), and rightly so since that's what we used. That 21 year old torque wrench (which had actually been used*, not just sitting in a tool box) was ---with-in specs--- when it was first calibrated at my work! It continues to stay in calibration for these last 32 years, being tested every 90 days.
Needless to say, my other two torques wrenches (that I bought) were Proto brand.

*We raced go-karts Internationally for about 8 years. He rebuilt everything from the frame to the engines to the transmissions and used that Proto torque wrench doing so.

 

For light torquing, digital torque adapters like this are my go to: The one that I have, which is similar, works down to 6N-m / 4.5ft-lb. It would work for lug nuts, but reading it and pulling steady torque at that level isn't as easy as a clicker or split beam.