I just found out my 94 LS with 197k miles has its original plugs and wires lol

 

I guess if you are getting decent mileage and performance it is fine. Can't believe you have that many miles on a set - when you change them you should snap a photo and post it. I am curious how clean they are.

 

will do! The shop that did my 90k pointed it out.

nuts, when i change it out ill take pics

 

In changing the spark plugs on my 1UZ, I found some oil, not alot, but some on the top of my cyl #5 spark plug. Anyone know the cause of this? The plug was not loose at all.

 

Is anti-seize recommended on the threads?

 

I used it, maybe 10k miles since plug change. No issues so far, it never occurred to me not to.



the car did go 128k on the original plugs and wires, both still working perfectly and looking very much like those pictured. Replaced with NGK iridiums and stock wires, I'm going for 150k this time. The distributor, for that matter, didn't show any signs of wear either except for a slight crust on the very tip of both blades.

Still on original coils.

 

yes...but u can get away with it like steve did. boy did i wish my plugs were like that when i pulled them out last week..doesnt help when im running lean.

 

nice! i just had a compression check on mine at 151,000 and its 190 across the board with not even a 5 lb drop anywhere!...i changed my tune up parts at 140 and they looked good then..these motors are amazing

 

Sounds like you could have some blow by? Pretty normal I suppose depending on miles, etc.

 

Actually the Iridium's I used stated to not use any

 

Is #5 the one below the PCV valve?, it might just be buildup from that slowly leaking over time.

The original plugs and leads looked in remarkably good condition in my '95 when I changed them after 82k, shows lexus didn't cheap out on anything when building these cars The leads however were datestamped 1990

 

Maybe the spark plug tube seal is leaky?

Steve, that's good mileage. I'm averaging 22-23 mixed on my 97 at about 200K miles. Thinking about doing my valves, have you ever done yours?

Rob

 

Never did the valves yet but at 235,000 maybe I am do also