Thats what mine runs too and as high as 33 degrees at 2000 rpm seems to flucuate rather quickly too, does yours?

 

Personally I think its a flow problem. I have the same issues. But when I press the pedal to get the idle (at a stoplight etc) up to about 1200 rpm it stays cool. It idles normally about 6-700rpm. and after two water pumps and quite a few forum reads of folks swapping out pumps and no good results I wonder if it isnt with something to do with port size?


Found this: http://www.wjjeeps.com/engine.htm
"The standard in-line 6 cylinder engine was significantly re-engineered in 1999. Upgrades included new cylinder heads with reduced-area exhaust ports, new exhaust manifolds, a new 50% more efficient slitter-vane water pump that added two horsepower,"

Why would they re-design the water pump..?

Edit: Additional info. http://jeepsunlimited.com/forums//sh....php?p=1578506
http://www.naxja.org/forum/showthread.php?t=14249
Im taking my pump and seeing if I can match it up to a slitter-vane .

 

Ok. Opinions needed. Pulled the spark plugs again today and found the #1 and 2 looking like this picture. A greenish tint on the end of the plug and white stuff on the top of the piston. What's this look like to you? I have a new head coming to get rid of the 0331 head could this be the source of all the problems?


First time the plug has looked like this.