I just changed the plugs in my 88 4.2 in anticipation of getting it smogged. This is what the plug looks like. I am thinking there shouldn’t be oil on the threads but not sure. Does this pic tell me anything or is this normal?
I am not sure yet. I just bought it and wasn’t driving much. It came with dry rot tires and I didn’t trust them to go far. If I have oil consumption, does it mean that I am on my way to a rebuild? Jeep has 47K on the ODO, but who know how much idle time etc.Yes, somewhat carboned up. Hows the oil consumption?
Good stuff gents. Thanks. I have done the tune up stuff. I drove it +\- 70 miles today. Ran like a top 65-75 straight down the highway. I will check for oil consumption and also put it under a black light to looks for leaks. I added die to the oil. I definitely had oil hitting the ground but couldn’t tell if I was melting off old crud or if I actually have a leak. This is so fun!There are some ash deposits forming, but I agree with Gilaguy...the plug you're currently running is a bit overkill. Biggest thing here is to start with manufacturer recommended tune-up items and settings, then drive it a while and recheck...when was the last time the plugs were changed?