Jeep 53030001 Regulator-Fuel Pressure

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For the fuel injector, remove the throttle body upper and lower bonnets. Detach the injector connector and remove the retainer. Discard the centering ring and upper and lower O-rings. Install the replacement O-rings and centering ring. For the fuel pressure regulator, remove the throttle body and the pressure regulator mounting screws. Remove the housing, spring, spring seats, diaphragm, and pivot. Clean the housing and reinstall the components. To replace the ISA motor, disconnect the ISA motor harness connector and detach the throttle return spring. Remove the mounting nuts and the ISA motor from the bracket. Reinstall the motor.

To fuel the body, start by detaching the cable from the negative battery terminal. Then, remove the throttle body and the three Torx head screws that attach the fuel body to it. Discard the original gasket and install a new one. For the fuel injector, remove the throttle body upper and lower bonnets. Detach the injector connector by compressing the lock tabs and lifting up. Remove the retainer and gently remove the injector by rocking it back and forth. Discard the centering ring and upper and lower O-rings. Lubricate the replacement O-rings and install them, along with the centering ring. Align the locating tab on the injector and install it, then tighten the retainer screws. Attach the injector connector and reinstall the bonnets. For the fuel pressure regulator, remove the throttle body and the mounting screws. Remove the housing, spring, spring seats, diaphragm, and pivot. Clean any foreign material from the housing. Install the new regulator, making sure the diaphragm vent hole is aligned with the vent holes in the throttle body and housing. Start the engine and check for leaks, then adjust the fuel pressure. To replace the throttle position sensor (TPS), remove the air inlet bonnets and the throttle body. Unplug the TPS connector and remove the mounting screws. Remove the TPS from the throttle shaft lever and reinstall it, making sure the TPS arm is underneath the throttle shaft lever. Have the TPS adjusted by a dealer service department. Lastly, for the idle speed actuator (ISA) motor, disconnect the harness connector and remove the throttle return spring. Remove the mounting nuts and the ISA motor from the bracket. Reinstall the motor and have it adjusted by a dealer service department.

The 3.9 liter and 5.2 liter engines featured a throttle-body fuel injection system which is a computer-regulated single-point system that is controlled through the SMEC which monitors the ignition period, A/F mixture, emission devices, the charger and the idle speed which is also responsible for fault coding. This unit holds the regulator, the fuel injector, the throttle position sensor, the throttle body temperature sensor as well as the idle speed control actuator, in case of the 5.2L engine. Getting to the throttle body, the air cleaner has to be removed, fuel pressure has to be reduced, the negative battery cable has to be disconnected and vacuum hoses and wire harness connectors have to be disconnected and marked. The throttle return spring, accelerator cable and bracket, as well as any speed control cable/transmission kick down linkage should also be removed next; the fuel supply and return hoses should be disconnected and the throttle body bolts loosened to allow lifting of the assembly clear of the intake manifold, a new gasket required when reinstalling the assembly. For the throttle body temperature sensor one has to remove the air cleaner, then disconnect the wire harness connector and then unscrew the sensor to have the heat transfer compound applied each time it is fixed back. Similar to the fuel pressuriser regulator, the procedure begins by disconnecting the negative terminal of the battery, then removing the vacuum hose from the regulator. The regulator is then unscrewed and has its gasket and O-ring replaced before being reinstalled. Aqually tricky are the fuel injectors, solenoid type-to get to them, one has to clearing the air cleaner assembly, relieving fuel system pressure, and disconnecting the negative battery cable as well as removing the holder clamp and then the injector carefully but with correct alignment and ensuring that they are lubed before they are put back. The removal and installation procedures of the throttle position sensor and idle speed control actuator are the same, with the removal of the negative cable and removal of the wire harnesses, with adjustment to the idle speed control after fitting. The Manifold Absolute Pressure (MAP) sensor differs a little across the models: the vacuum hoses and electrical connectors must be disconnected, after that the sensor must be unscrewed or unclipped to be replaced. This is followed by the Single Module Engine Controller where the air cleaner duct has to be cleared, the module has to be unscrewed and the wire harness has to be disconnected before it is screwed and installed back in a reverse manner.

To work on the throttle body, start by detaching the negative battery cable and relieving fuel pressure. Disconnect the flexible air duct and unplug the idle speed stepper motor and throttle position sensor wire connectors. Remove the MAP sensor vacuum tube from the throttle body and detach the throttle linkage, and if there's an automatic transmission, detach the line pressure cable. Then, remove the mounting bolts, throttle body, and gasket, making sure to discard the old gasket and clean the mating surfaces on the throttle body and intake manifold. For the idle speed stepper motor, disconnect the negative battery cable, unplug the wire connector, remove the retaining screws, and pull off the motor. Installation is the reverse of removal. To work on the throttle position sensor, detach the negative battery cable, unplug the TPS wire connector, and remove the retaining screws while bending back the TPS lock tabs if present. Then, detach the TPS from the throttle plate assembly and have it adjusted by a dealer service department. For the fuel injector rail assembly, relieve fuel tank pressure and system fuel pressure, disconnect the negative battery terminal, numerically label and unplug the injector harness connectors, detach the vacuum tube from the fuel pressure regulator, and remove the fuel supply hose, fuel return line from the intake manifold, and fuel return line from the fuel pressure regulator. Remove the fuel rail mounting bolts, and if there's an automatic transmission, consider removing the automatic transmission line pressure cable and bracket to remove the fuel rail assembly. Carefully remove the fuel rail by rocking and pulling up on it until all injectors are out of the intake manifold, and then installation is the reverse of removal, ensuring proper seating of the injectors and using a new O-ring, spacer, and retainer repair kit when reattaching the fuel lines. To work on the fuel injector, follow the steps to relieve fuel pressure and detach the negative battery cable, and remove the fuel injector rail assembly. Remove the retaining clip(s) from the injectors and replace the O-rings and seals, ensuring you use the correct ones from the kit and coat them with a little fuel before installing the injectors. For the fuel pressure regulator on 1995 and earlier models, relieve fuel tank pressure and system fuel pressure, disconnect the negative battery terminal, and remove the regulator retaining screws or clip. Pull the regulator off the fuel rail, replace the O-ring, and install it with a new one before reinstallation. On 1996 and later models, the regulator is integrated with the fuel pump module and cannot be serviced separately. For 1997 and later models, relieve fuel pressure, remove the fuel tank, disconnect the fuel line, pry the retainer clamp loose, carefully remove the filter/regulator, replace the gasket, and ensure the new filter/regulator has both O-rings in place and apply clean engine oil to them before installation. Reattach the retainer clamp and complete the rest of the installation in reverse.

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