Spark Plugs (Jeep)

Jacob Dryer · Oct 30, 2010

So I changed my spark plugs in my Jeep today (all 16...)

I don't know much about "reading" them though, so I took some pics, can anyone tell me if they are showing anything I need to pay attention to in the future?

The whole group

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Close up of one of the darker ones.

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EddieS'04 · Oct 31, 2010

IMO, from the one close up. The cylinders are burning clean and normal. I dont see any deposits, carbon or uneven wear.

Kevin Palmer · Oct 31, 2010

I agree, from the upper picture they all look to be fairly white... That is a good thing.

Jacob Dryer · Oct 31, 2010

Ok thanks, just one of those things I never learned what to look for.. I know to replace them, and I know they can tell you something, but I'll have to let others tell me what :haveabeer:

Gavin Allan · Oct 31, 2010

Don't forget to gap the new plugs and put some never-sieze on the threads. Torque wrench is also good too. I always put a little dab of dielectric grease on the terminals and clean the boots of the coils /wires too. Good luck!

Jacob Dryer · Oct 31, 2010

Already done but thanks.

Torque wrench was used along with anti-sieze and dielectric grease.

No wires since it's a coil pack of some sort right on top of each pair of plugs.

It seems to be running well, I was hoping to recoop a few mpgs, since it's been lower than I expected. So I did spark plugs, egr valve, both diff fluids, and the transfer case.

I've only been averaging 14.6 mpgs since we bought it. I don't expect a lot, but I was thinking more like 16-18.. So we'll see. Major road trip planned in a few weeks.