DELPHI EFI High pressure fuel line is serviced as a complete assembly to prevent tampering and safety hazards. Components are not individually serviceable. IMPORTANT NOTES! Ɣ&OHDQOLQHVVLVHVVHQWLDODQGPXVWEHPDLQWDLQHGDWDOO times when servicing or working on EFI system. Dirt, HYHQLQVPDOOTXDQWLWLHVFDQFDXVHVLJQLїFDQW problems. Ɣ&OHDQDQ\MRLQWRUїWWLQJZLWKSDUWVFOHDQLQJVROYHQW before opening to prevent dirt from entering system. Ɣ$OZD\VGHSUHVVXUL]HIXHOV\VWHPWKURXJKIXHO connector on fuel pump module before disconnecting or servicing any fuel system components. Ɣ1HYHUDWWHPSWWRVHUYLFHDQ\IXHOV\VWHPFRPSRQHQW while engine is running or ignition switch is ON.
Ɣ'RQRWXVHFRPSUHVVHGDLULIV\VWHPLVRSHQ&RYHU any parts removed and wrap any open joints with plastic if they will remain open for any length of time. New parts should be removed from their protective packaging just prior to installation. Ɣ$YRLGGLUHFWZDWHURUVSUD\FRQWDFWZLWKV\VWHP components. Ɣ'RQRWGLVFRQQHFWRUUHFRQQHFW(&8ZLULQJKDUQHVV connector or any individual components with ignition on. This can send a damaging voltage spike through ECU. Ɣ'RQRWDOORZEDWWHU\FDEOHVWRWRXFKRSSRVLQJ terminals. When connecting battery cables attach SRVLWLYHFDEOHWRSRVLWLYHEDWWHU\WHUPLQDOїUVW followed by negative () cable to negative () battery terminal.
Ɣ1HYHUVWDUWHQJLQHZKHQFDEOHVDUHORRVHRUSRRUO\ connected to battery terminals. Ɣ1HYHUGLVFRQQHFWEDWWHU\ZKLOHHQJLQHLVUXQQLQJ Ɣ1HYHUXVHDTXLFNEDWWHU\FKDUJHUWRVWDUWHQJLQH Ɣ'RQRWFKDUJHEDWWHU\ZLWKNH\VZLWFK21 Ɣ$OZD\VGLVFRQQHFWQHJDWLYHEDWWHU\FDEOHEHIRUH charging battery, and also unplug harness from ECU before performing any welding on equipment. Vent hose assembly is intended to vent fuel vapor out of fuel pump module and direct fuel vapor into throttle body. All EFI engines are equipped with an engine mounted SXUJHSRUWRQF\OLQGHUEDUUHOEDIAH7KLVFDSSHG purge port can be used by OEM to vent fuel tanks or used in conjunction with a carbon canister kit for Tier III evaporative emissions compliance.
Purge port connects to vent hose assembly and directs all fuel vapor into throttle body. If purge port remains unused, port must remain capped to prevent dirt from entering engine. EFI engines have no carburetor, so throttle function UHJXODWHLQFRPLQJFRPEXVWLRQDLUARZLVDFKLHYHGZLWK a throttle valve in a separate throttle body attached to intake manifold. Throttle body/intake manifold provides mounting for fuel injectors, throttle position sensor, MAP sensor, intake air temperature sensor, high pressure fuel line, idle speed screw, and air cleaner assembly. Idle speed is only adjustment that may be performed on EFI system.
Standard idle speed setting for EFI engines is 1500 RPM, but certain applications might require a different setting. Check equipment manufacturer’s recommendation. For starting and warm up, ECU will adjust fuel and ignition timing, based upon ambient temperature, engine temperature, and loads present. In cold conditions, idle speed will probably be different than normal for a few moments. Under other conditions, idle speed may actually start lower than normal, but gradually increase to established setting as operation continues. Do not attempt to circumvent this warm up period, or readjust idle speed during this time.
Engine must be completely warmed up, in closed loop operating mode for accurate idle adjustment. 26 KohlerEngines.com 24 690 01 Rev. D