Hello all, I have an 86 Sami with a 94 1.6L 16valve. I have had no issues until now. At idle I’m getting white smoke from the tail pipe at idle, when I give it throttle it goes away, weird thing for me is it’s a little hit and miss. The temp gauge reads normal, my resivor tank was a little full, no water in the oil. My coolant level was 2 drinking bottles of water low when I first checked, I added water and it’s hit and miss on the smoke, I am getting moisture in the tailpipe, but engine runs fine with no sputtering or bad performance. I was assuming head gasket but I’ve also read maybe pvc valve or valves out of whack. Any help would be greatly appreciated.

Water vapor is a normal byproduct of the combustion process and the presence of moisture in the exhaust is not necessarily indicative of a problem - is the coolant level continuing to drop?

Also be aware that whilst water can be used as a coolant, it's not the best choice - once you've resolved any issues causing a loss of coolant (which may or may not be head gasket related - I see no cause to suspect a failed gasket at this point), consider replacing what is in the engine with the appropriate mix of coolant.