Discovery I (LJ) V8-4.0L (1996)
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4.
Make a clean copy of the Fuel Injector Balance Test worksheet.
5.
Allow pressure to stabilize and record fuel pressure on worksheet.
6.
Shut off the fuel pump and verify that fuel pressure remains constant.
NOTE:
If pressure drops rapidly there are several possible causes:
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The check valve in the fuel pump may be faulty
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The fuel pressure regulator may be damaged
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An injector may be leaking
To provide effective fuel control to the engine the injector must:
1.
Not leak when it is closed
2.
Open and close reliably
3.
Allow the flow of a specified amount of fuel while open.
In order to accomplish these tasks not only does the injector need to be in good mechanical condition, with consistent fuel pressure, it must also receive
the appropriate signals from the ECM. Use the following tests to confirm the injector system's operation
CAUTION:
Do not pinch the fuel lines on 97112 Discovery Advanced EVAPS vehicles built after VIN 546030/714242. These vehicles are fitted with special
fuel lines which will be damaged if pinched. Vapor or fuel loss could occur. The Evaporative Emission System Test Equipment contains adapters
which permit plugging of the fuel lines for test purposes. DO NOT CLAMP FUEL LINES.
7.
If the fuel pressure remains stable, proceed with the injector balance test.
8.
If the fuel pressure drops perform the following checks to determine the cause:
