on the backside of the engine
The 1992 Nissan modulator valve can be found on the firewall in the engine compartment. The valve will be on the drivers side of the firewall.
where is the pcv valve located on a 2003 Nissan sentra
where is PVC valve located on 2002 Nissan sentra
You can find the PCV valve for your 1987 Nissan on top of the engine. The PCV valve will be near the air filter housing.
PCV VALVE - Under hood, center, upper engine area, mounted in intake manifold
The thermostat on a 1989 Nissan Sentra is on the front of the motor to the left. It is just below where the valve cover meets top of the manifold. The thermostat is enclosed in the radiator hose at that location.
vacume by pass cut out valve nissan 1.8 sentra
Check out this website for it's location b15sentra.net/forums/showthread.php?t=142973
In the valve body of the transmission.
It should be right on the valve cover somewhere.
More than likely you have a valve cover leak. You probably need to replace the gasket(s).