Well, not very exciting Bronco project this weekend. I changed the spark plugs. I did some research and determined NGK NGK Ruthenium HX LTR7BHX was the best available plug for my intended use. NAPA actually had a slightly different plug they marked as exact fit and I did use the recommended part number, maybe the stock heat range is different (above part is one step “colder”)? I think they ended up about $16 per plug with an online ordering discount.
Standard service interval is 100k, severe duty, 60k. I’m at about 65k. Three of the six plugs were slightly out of spec (over .30 gal) 3 were still in spec, so probably about the right time for me to change them. Colors looked good, definitely some corrosion on the passenger side plugs. I assume I picked up some moisture at some point, and it wasn’t severe, by noticeably more resistance coming out.
Each plug got a light coat of anti seize and some fresh dialectric grease on the boot.
It does run a bit smoother and the occasional low idle miss I could feel seems gone.
