The stock amp in a 1990 Mercury Grand Marquis is in the dash behind the radio.
my 1990 mercury marquis transmission is slipping in overdrive what do i need to look for and how can i fix it
8 spark plugs
check your idle air control valve
the fuel pump is located inside of the gas tank.
Check the engine end of the upper radiator hose
For a 1990 Mercury Grand Marquis : According to my Chilton's Auto Repair Manual : ( 20.0 U.S. gallons with the 5.8 liter / 351 cubic inch V8 ) ( 18.0 U.S. gallons with the 5.0 liter / 302 cubic inch V8 )
underside of the car in front of the fuel tank.
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
The thermostat is located on the front of the engine under the elbow at the end of the radiator hose
Yes, this is normal. It will not pop out in reverse, only drive.
Marquis Childs died in 1990.