The PCV valve is located under the MAP sensor on a 1990 Pontiac Grand Prix. The MAP sensor is in the upper plenum.
Check the engine end of the upper radiator hose
the fuel pump is located inside of the gas tank.
The stock amp in a 1990 Mercury Grand Marquis is in the dash behind the radio.
The thermostat is located on the front of the engine under the elbow at the end of the radiator hose
you dont
No
counterclockwise
8 spark plugs
Fuse or relay defective.
YES , a 1990 Mercury Grand Marquis 5.0 liter V8 engine has a PCV valve ( Motorcraft part number EV-98-B ) going into the intake manifold
It doesn't have one. The car uses Fuel Injectors. ============================================================================= According to my Chilton's Auto Repair Manual : For a 1990 Mercury Grand Marquis : The 5.0L / 302 cubic inch V8 is fuel injected The 5.8 / 351 has a carburetor ( the 8th " character " of the VIN is a " G " ) The carburetor is located on the top of the engine , below the engine air filter housing