Good news, I think I spotted where my coolant leak is but lets take a look @ something else...

It is on the right housing (driving side) on the front lower leading sparkplug wire and I believe 2nd coolant drain plug (that area is moist as seen...and should that 2nd unsued thread have a free/opening like that?). Are these the symptoms of coolant entering combustion chamber? I don't think so b/c it appears more of light film of oil in the brown area and sparkplug no stains around the area...just on plug wire itself. Could be minor splip-splash from brown area? This is the only sparkplug wire that has the tip "brown" like that. I didn't have chance to inspect futher but I will go and loosen/inspect/retighten the sparkplug tomorrow prob.





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Positive Notes (knock-on-wood, ha!):
1) Idle is been perfectly stable and fine at 700rpm-900rpm as it has been ever since I got car (2 years ago)
2) No puff of any colored smoke (including white) at all either at start up or after a drive
3) Car starts fine on first try...no sluggish, miss fires, etc.
4) No overheating...temps is average 95C/203F
5) See my complete mods: https://www.rx7club.com/vbgarage.php?do=view&id=70583

 

Check your knock sensor to see if it's leaking. It has an insulating "goo" that tends to melt when it gets old.