Tightening Specifications
- Refer to OVERVIEW - FUEL INJECTORS .
-- Install the high pressure lines, refer to HIGH PRESSURE LINES, REMOVING AND INSTALLING .
Lubricate all of the O-rings with assembly oil or engine oil before installing.
-- Carefully press the return line connections over the new sealing ring and onto the injector. The connection must engage audibly. Then press the release pin down carefully.
The "injector quantity calibration" and the "injection pressure calibration" for the new fuel injectors must be programmed into the Engine Control Module (ECM) after replacing one or more fuel injectors, refer to FUEL INJECTORS, ADAPTING CORRECTION VALUES .
Check all the other injectors as well regarding their "injector quantity calibration" and "injection pressure calibration" to make sure all comparison values have been entered correctly. If the correct comparison value have been stored in the ECM, then these comparison value must never be re-entered.
Fuel System, Bleeding and Performing a Leak Test
-- Let the engine run a few minutes at idle without pressing the accelerator pedal and then stop the engine.
The high pressure connections must not be opened; the fuel system bleeds itself.
-- Switch off ignition.
-- Carefully check the entire fuel system and the six return line connections for leaks.
If there are leaks even though the correct tightening specification was used, replace the affected component.
-- Perform a road test where the accelerator pedal is pressed all the way down at least one time. Then check the high pressure area again for leaks.
If there is still air in the fuel system, the engine may switch to emergency mode during the road test. Turn off the engine and erase the Diagnostic Trouble Code (DTC) memory. Then continue the road test.
-- Check the DTC memory after the road test.