Possible Cause Operation
Battery
Ground connections
End of compression pressure End of compression pressure
Power to the spark plug Spark plug
Shielded cap
HV coil
Speed-timing sensor
Ignition advance
Fuel system Fuel pressure (low)
Injector capacity (low)
Injector sealing (poor)
Correctness of the parameters Coolant temperature
Stepper throttle valve position intake air temperature (steps
and actual opening)
Cleaning of the auxiliary air pipe and throttle valve; air filter ef-
ficiency
Engine stops at idle
ENGINE DOES NOT HOLD IDLING/ IDLING IS UNSTABLE/ IDLING TOO LOW
Possible Cause Operation
Presence of faults detected by the self diagnosis Pump relay
H.V. coil
Injector
revolution timing sensor
Air temperature
Coolant temperature.
Atmospheric pressure
Ignition efficiency Spark plug
Ignition timing
Correctness of the parameters Throttle valve position sensor
Stepper
Coolant temperature sensor
Intake air temperature sensor
Intake system cleaning Air filter
Diffuser and throttle valve
Additional air pipe and Stepper
Intake system sealing (infiltrations) Intake manifold - head
Throttle body - manifold
Intake sleeve
Filter box
Fuel system (low pressure) Fuel pump
Pressure regulator
Fuel filter
Injector capacity
Analysis of exhaust fumes before the catalytic converter Trimmer value adjustment (CO % adjustment)
Engine does not rev down
ENGINE DOES NOT RETURN TO THE IDLING SPEED/IDLING SPEED TOO HIGH
Possible Cause
Operation
Presence of faults detected by the self diagnosis Pump relay
H.V. coil
Injector
revolution timing sensor
Air temperature
Coolant temperature.
Atmospheric pressure
Ignition efficiency Ignition timing
Correctness of the parameters Throttle valve position sensor
Stepper
Coolant temperature sensor
Intake air temperature sensor
Injection Beverly 500 i.e.
INJEC - 178
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