It is under the air filter housing.
Evaporative Emission Control System control valve malfunction. You need a new evap control surge solenoid valve.
There is no heater control valve fitted on a Ford Escort. The heater matrix is directly connected to the engine's cooling system. To reach the heater matrix, you should remove all the facia unfortunately... :(
go to autozone.com
doesnt have one
computer control
The idle air control valve on a 1990 Ford Escort is located on the intake manifold. An idle air control valves function is to control the amount of air that is allowed to enter the engine so the idle can stabilize.
The schrader valve on the low pressure side of the system.
the brake control valve is used to control the amount of hydrauic pressure form the hydraulic system to the brake system through the metering valve.
idle air control valve error.... try to clean it up
a gate valve is a one way totally open or closed valve, a control valve is a variable valve.
A vacuum leak or a faulty IAC (Idle Air Control) valve.
Intake manifold runner control aka imrc valve