9000 Hatchback L4-2290cc 2.3L DOHC Turbo EFI (1994)
M1994- 900 Service Manual 2:7 Engine Management System, Trionic, P/N 03 56 733 ).
Carry out flow capacity measurement as described in the Service Manual. Poor fuel pump capacity and incorrect fuel pressure will affect the flow
capacity. In the event of reduced capacity, try using injector cleaner.
Low flow capacity could generate a DTC for adaptation, oxygen sensor.
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Fuel pressure regulator
Check the fuel pressure as described in the Service Manual.
Check the hose between the air side of the regulator and the intake manifold for damage causing air leakage.
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Fuel pump
Check flow capacity and fuel pressure as described in the Service Manual.
Incorrect fuel flow/capacity may also be due to a clogged fuel filter or pinched fuel hose.
Low fuel pump capacity may result in poor wide open throttle performance.
Low fuel volume can cause driveability problems at higher engine loads.
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EVAP canister purge valve
A DTC will be generated only in the event of an electrical fault in the valve.
Check the valve for leakage. Consequential faults, see "Injectors".
Valves with internal leakage may result in a DTC for the oxygen sensor and irregular idling.
Check connectors H6-5, H10-5 and H10-7.
