Hi all so after a year of standing still yesterday I finally took out the s14 for a drive was fine for a wile. Then it started smoking from expantion tank. And was nearly full of coolant.
I run a compression test and was 140 across all 4 cylinders, no oil in water and no water in oil. Could this be thermostat thats stuck or air in cooling system? Radiator blocked or water pump? Or head gasket? Seems wird that expantion tank is full to max boiling and level won't go down. Also when it gets hot the idle shoots up. Any suggestions

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