BMW 13641707843 Fuel Injector

Disconnect the negative battery cable, ensuring to read the battery disconnection cautions beforehand. Working at the front of the engine compartment above the radiator, remove the air intake hood expansion rivets and lift off the hood. Remove the upper engine cover. Loosen the fuel tank cap. At the rear of the manifold, use a special tool to press the locking clip inside the end of the fuel line fitting to disconnect the fuel supply line from the fuel rail, then cap the fuel lines. Above the intake manifold, detach the secondary air injection check-valve solenoid vacuum lines, as well as the electrical connectors for the knock sensor, camshaft sensor, secondary air injection check-valve solenoid, engine coolant temperature sensor, alternator, coolant thermostat, and throttle housing. Remove the left and right engine wire duct mounting nuts, pry out the ignition coil cover trim caps, remove the fasteners, and lift the covers off the left and right side ignition coils. Detach the ignition coil connectors and coil grounding wires, then detach the fuel injector electrical connectors by releasing the spring clip on each injector. Lift the left side engine wire duct and fold it toward the right side of the engine, placing both electrical ducts to the right, away from the intake manifold. If necessary, disconnect the engine oil level sensor and crankshaft sensor harnesses underneath the engine. Remove the fuel rail mounting bolts, marking the intake manifold cover support brackets for reinstallation. Pull the fuel rail and fuel injectors straight up and remove them from the intake manifold, prying off the retaining clip to detach the fuel injector from the rail. Be prepared to catch any spraying or dripping fuel, and when reinstalling, ensure to replace the fuel injector sealing O-rings, coating the seals with acid-free lubricant. The remainder of the installation follows the reverse order of removal.

The throttle butterfly on the N62 is not used for load control as this is operated through the Valvetronic system that is employed to vary the lift of the intake valve. In the present study it was observed that the ECM supplies operating voltage and ground to the throttle valve for its operation. Valvetronic The accelerator pedal position module (PWG) transmits two variable voltage signals to the ECM on the position and speed of the accelerator pedal. PWG has Dual Hall sensors that make the ECM check values with a view of comparing them and using the lower signal in case there is a difference; this makes the rate of acceleration to be slow. The hot film mass air flow sensor respond to changes in the currents as the heated film cool, detects the mass of air flow into the air inlet pipe and the ECM uses this data in controlling fuel injection. There is a temperature sensor inside the MAF sensor to inputs necessary correction for air volume when changes in intake air temperature have occurred. The intake manifold is variable, and the actuator is a rotor that the ECM can control via a drive unit comprising a 12 V electric motor and a potentiometer for sensing the position; if the manifold fails, it will stay in a previously used position and may lead to a power loss. The Valvetronic system contained an intake valve control that opens and lifts in accordance with the engine speed and load, while faults were detected by the Valvetronic control module and sent to the ECM for diagnosis. Fuel injectors are located close to the intake valves for improved fuel droplet formation and lowered fuel use and emissions; a servicing port is provided for fuel pressure checks. The ME 9.2.1 system is equipped with eight individual fuel injector circuits and, in the case of a faulty injector, one or multiple injectors can be switched off to prevent damage to the catalytic converter. The ECT sensor is installed in the thermostat housing, and sends signals with the data of voltage variations proportional to the change of temperatures to the ECM in order to adjust the fuel mixture and ignition timing.