Diagnosis of malfunctions of the injection system (Gasoline engines / CFI injection system / Ford Escort 4 1986-1990)

CAUSE	ELIMINATION METHOD
Cold engine won't start
When the ignition is turned on, the fuel pump does not work	Check voltage supply to fuel pump. If the pump does not work when voltage is applied to the pump, then it must be replaced
25A JNS fuse blown	Replace fuse
Faulty control relay	Remove the relay, close the terminals 30 and 87 on the connector with a wire with a 16 A fuse, turn on the ignition. The pump must then run
Faulty thermal switch	If only a cold engine does not start, check the thermal time switch
Faulty starting injector	If only a cold engine does not start, check the starting injector
Auxiliary air duct defective	If only a cold engine does not start, check the operation of the additional air damper
Hot engine won't start
Idle speed and CO content not adjusted	Check and, if necessary, adjust the idle speed and CO content
Faulty thermal switch	Replace thermal switch
Leaky start nozzle	Check the tightness of the starting injector
Defective heating controller	If only a hot engine does not start, check the warm-up control
Leaky air supply system	Check the tightness of the air supply system
Leaky fuel system	Check fuel system for leaks. Additionally tighten all connections
Unstable operation of the engine up to a stop
Idle speed and CO content not adjusted	Check and, if necessary, adjust the idle speed and CO content
Auxiliary air duct defective	Check the operation of the additional air damper
Nozzle not closing	Check start injector
Oil gauge or oil filler cap incorrectly installed on Turbo RS engine	Check and adjust if necessary. Since July 1988, an improved oil level gauge has been installed
Engine constantly stops
Broken fuel pump power circuit	Check and, if necessary, repair the electrical supply circuit of the fuel pump
Clogged fuel filter	Replace fuel filter
Faulty fuel pump	Replace fuel pump
Faulty fuel distributor	Check and, if necessary, replace the fuel distributor
Leaky fuel system	Check fuel system for leaks. Additionally tighten all connections
Increased fuel consumption
The composition of the working mixture is incorrectly adjusted	Adjust the composition of the working mixture
High idle
Auxiliary air duct defective	Check if the auxiliary air damper closes completely

Diagnosis of malfunctions of the injection system

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