Engine Controls - Remove/install/overhaul - 3.1l Oldsmobile Achieva I final

INTRODUCTION

This article covers removal, overhaul and installation procedures (when given by manufacturer). If component removal and installation is primarily an unbolt and bolt-on procedure, only a torque specification may be supplied.

POWERTRAIN CONTROL MODULE (PCM)

Note. Before replacing PCM, carefully inspect all wiring and control components. Failure to test for short circuits may result in repeated PCM failure due to shorts. To prevent internal damage to PCM, ensure ignition switch is in OFF position when connecting or disconnecting PCM connectors or any electrical components.

Removal & Installation

Turn ignition off. Disconnect negative battery cable. Locate PCM. See PCM LOCATION table. Remove any necessary components to gain access to PCM. Disconnect electrical connectors from PCM. Remove PCM mounting bolts (if equipped). Remove PCM. To install, reverse removal procedure. Transfer any necessary components (i.e., knock module, EEPROM, etc.) to new PCM before installation. Program replacement PCM using appropriate equipment and latest software.

PCM LOCATION

ELECTRICALLY ERASABLE PROGRAMMABLE READ-ONLY MEMORY (EEPROM)

EEPROM is a permanent memory that is part of PCM. EEPROM cannot be replaced. EEPROM contains program and calibration information that PCM uses to control powertrain. If PCM is replaced, ensure NEW PCM software/calibration is correct and most recent version for vehicle. EEPROM must be programmed when NEW PCM is installed. Program EEPROM using latest software for that specific vehicle.

1. Disconnect negative battery cable. Disconnect connectors at ignition control module. (Scheme 3) Disconnect spark plug wires from coil pack. Remove coil pack/ignition control module assembly. For ignition control module location, see COMPONENT LOCATIONS in SYSTEM/COMPONENT TESTS - 3.1L article. Separate ignition coil(s) from ignition control module (if possible).
2. To install, reverse removal procedure. Tighten ignition control module mounting bolts/nuts. Tighten mounting bolts/nuts to specification. See «TORQUE SPECIFICATIONS»(/oldsmobile/achieva/i-final-1998-1998/remont/removal-installation/#engine-controls-removeinstalloverhaul-31l__torque-specifications).

Scheme 3

Disconnect negative battery cable. Remove serpentine belt. Remove power steering pump assembly. Disconnect electrical connector from camshaft position sensor. Remove camshaft position sensor mounting bolt and remove camshaft position sensor. To install, reverse removal procedure. Tighten camshaft position sensor bolt to specification. See TORQUE SPECIFICATIONS .

1. Disconnect negative battery cable. Turn steering wheel fully to left. Raise and support vehicle. Disconnect sensor harness connector. Remove sensor mounting bolt. Remove sensor from engine block.
2. Inspect sensor "O" ring for wear, cracks or other damage. Replace as necessary. Lubricate NEW "O" ring with engine oil before installing. To install, reverse removal procedure. Tighten sensor bolt to specification. See «TORQUE SPECIFICATIONS»(/oldsmobile/achieva/i-final-1998-1998/remont/removal-installation/#engine-controls-removeinstalloverhaul-31l__torque-specifications) .

1. Disconnect negative battery cable. Remove serpentine belt from crankshaft pulley. Raise and support vehicle.
2. Remove crankshaft harmonic balancer bolt. Using Balancer Remover (J-24420-B), remove harmonic balancer. Disconnect sensor harness connector. Remove sensor bolts. Remove sensor.
3. To install, reverse removal procedure. Apply Thread Sealer (GM 1052080) to threads of harmonic balancer bolt. Tighten sensor and harmonic balancer bolts to specification. See «TORQUE SPECIFICATIONS»(/oldsmobile/achieva/i-final-1998-1998/remont/removal-installation/#engine-controls-removeinstalloverhaul-31l__torque-specifications) .

Disconnect negative battery cable. Remove spark plug wires from ignition coils. Remove nuts or screws attaching ignition coils to ignition control module. Remove ignition coils. To install, reverse removal procedure.

FUEL PRESSURE RELIEF

Fuel system is under pressure. Pressure must be relieved prior to servicing fuel system. Fuel pressure may be relieved by using one of the following methods.

1. Disconnect negative battery terminal. Loosen fuel filler cap. Install Fuel Pressure Gauge (J-34730-1A) on fuel pressure connector of fuel rail. Wrap shop towel around pressure connection when installing fuel pressure gauge to absorb fuel leakage. Install gauge bleed hose in container. Open bleed valve to bleed fuel pressure.

Removal Procedure (Achieva, Grand Am, Skylark)

Note. Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering the open pipes and passages.

1. Relieve fuel system pressure. Refer to «FUEL PRESSURE RELIEF»(/oldsmobile/achieva/i-final-1998-1998/remont/removal-installation/#engine-controls-removeinstalloverhaul-31l__fuel-pressure-relief) .
2. Raise vehicle.
3. Disconnect the quick-connect fitting at the inlet of the in-pipe fuel filter.
4. Disconnect the threaded fitting at the outlet of the in-pipe fuel filter.
5. Drain any remaining fuel into an approved gasoline container.

Installation procedure

1. Remove protective caps from new filter.
2. Install the fuel filter fitting using new O-ring in same position as old filter.
3. Connect the quick-connect fitting at the inlet of the in-pipe fuel filter. NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
4. Connect the threaded fitting at the outlet of the in-pipe fuel filter. Tighten Use a back-up wrench in order to prevent the in-pipe fuel filter from turning. Tighten the in-pipe fuel filter outlet nut to 27 Nm (20 lb ft).
5. Lower the vehicle.
6. Tighten the fuel filler cap. CAUTION: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
7. Reconnect the negative battery cable.
8. Inspect for leaks. Turn the ignition switch ON for 2 seconds. Turn the ignition switch OFF for 10 seconds. Turn the ignition switch ON. Check for fuel leaks.

THROTTLE BODY (SFI)

Removal

1. Relieve fuel pressure. See «FUEL PRESSURE RELIEF»(/oldsmobile/achieva/i-final-1998-1998/remont/removal-installation/#engine-controls-removeinstalloverhaul-31l__fuel-pressure-relief) . Disconnect negative battery cable. Remove air intake ducts. Disconnect and mark electrical connections and vacuum hoses from throttle body. Disconnect control cables from throttle body.
2. Drain cooling system and remove coolant hoses to throttle body (if applicable). Remove throttle body retaining bolts. Remove throttle body and gasket.

Note. Identification number is stamped on throttle body. Use identification number to order replacement components.

Installation

1. To install, reverse removal procedure using NEW gasket. Tighten throttle body retaining bolts to specification. See «TORQUE SPECIFICATIONS»(/oldsmobile/achieva/i-final-1998-1998/remont/removal-installation/#engine-controls-removeinstalloverhaul-31l__torque-specifications) . Refill cooling system (if drained).
2. If installing NEW Idle Air Control (IAC) valve, ensure IAC pintle length setting is adjusted before installation (if applicable). See IDLE AIR CONTROL (IAC) VALVE. Adjust idle speed and TP sensor (if removed, and if adjustable). See ADJUSTMENTS - 3.1L article.

1. Relieve fuel pressure. See «FUEL PRESSURE RELIEF»(/oldsmobile/achieva/i-final-1998-1998/remont/removal-installation/#engine-controls-removeinstalloverhaul-31l__fuel-pressure-relief) . Disconnect negative battery cable. Remove intake manifold plenum and gaskets. Disconnect pressure regulator vacuum hose. Remove fuel return line and "O" ring from pressure regulator.
2. Remove pressure regulator screws. Remove pressure regulator from fuel rail. Remove pressure regulator retainer and spacer assembly from fuel rail (if equipped). Remove fuel inlet "O" ring from pressure regulator. Remove and discard filter screen if dirty.

To install, reverse removal procedure. DO NOT reuse "O" rings. Lubricate NEW fuel inlet "O" ring with oil and install in regulator. Replace filter screen as necessary. Tighten screws to specification. See TORQUE SPECIFICATIONS .

FUEL RAIL & INJECTORS

Note. If injector is replaced, ensure replacement injector has the same part number as injector removed.

1. Relieve fuel pressure. See «FUEL PRESSURE RELIEF»(/oldsmobile/achieva/i-final-1998-1998/remont/removal-installation/#engine-controls-removeinstalloverhaul-31l__fuel-pressure-relief). Disconnect negative battery cable. Remove air intake duct (if necessary). Remove intake manifold plenum and gaskets.
2. Disconnect vacuum hose at fuel pressure regulator. Disconnect and plug fuel return line at pressure regulator. Disconnect and plug fuel inlet line at fuel rail. Disconnect electrical connectors from injectors.
3. Remove fuel rail retaining bolts. Remove fuel rail from intake manifold using equal force on both sides of fuel rail. see scheme 3 Remove injector-to-fuel rail retaining clip (if equipped). Remove injectors from fuel rail. Remove injector "O" rings and discard.

To install, reverse removal procedure. Coat NEW injector "O" rings with clean engine oil. Install injector-to-fuel rail retaining clip with open end facing injector electrical connection. Position fuel rail on intake manifold. Push down on rail to seat injectors in manifold. Tighten fuel rail retaining bolts. See TORQUE SPECIFICATIONS . To complete installation, reverse removal procedure.

Scheme 4

Disconnect electrical connector from IAC valve. Remove IAC valve, gasket and "O" ring from throttle body assembly.

1. Inspect gasket or "O" ring for damage. Replace as necessary. Check extended distance of IAC pintle before installing. Damage will occur if measurement is incorrect. Distance must not exceed 1.100" (28 mm). Measurement should be taken from valve housing flange to end of pintle cone.
2. To retract NEW IAC valve pintle, slowly exert finger pressure on valve. Install NEW "O" ring or gasket on valve. Coat "O" ring with clean engine oil. Install IAC valve. Tighten IAC valve to specification. See «TORQUE SPECIFICATIONS»(/oldsmobile/achieva/i-final-1998-1998/remont/removal-installation/#engine-controls-removeinstalloverhaul-31l__torque-specifications) . Reconnect electrical connector to IAC valve. To reset IAC valve, refer to ADJUSTMENTS - 3.1L article.

1. Relieve fuel pressure. See «FUEL PRESSURE RELIEF»(/oldsmobile/achieva/i-final-1998-1998/remont/removal-installation/#engine-controls-removeinstalloverhaul-31l__fuel-pressure-relief) . Disconnect negative battery cable. Remove filler neck. Lower fuel tank. Disconnect fuel lines and electrical connection.
2. Remove fuel level sending unit and fuel pump retaining bolts or cam lock ring. Lift assembly from fuel tank and remove fuel pump from sending unit.
3. Pull fuel pump upward while pulling away from bottom support. DO NOT damage rubber insulator and strainer. To install, reverse removal procedure using NEW "O" ring and gasket.

Turn ignition off. Disconnect electrical connector from TP sensor. Remove TP sensor retaining screws. Remove TP sensor from throttle body. With throttle valve in closed position, install TP sensor on throttle body. Ensure TP sensor lever engages with drive lever on throttle shaft. Install retaining screws and electrical connector. TP sensor is self-zeroing and is not adjustable.

OXYGEN SENSOR

Oxygen sensor is mounted in exhaust pipe, below exhaust manifold. It is equipped with a permanent pigtail which must remain intact when removing sensor.

1. Ensure oxygen sensor is free of contaminants. DO NOT use cleaning solvents of any type. Oxygen sensor may be difficult to remove when engine temperature is less than 120°F (48°C). Excessive removal force may damage threads in exhaust manifold or pipe.
2. Disconnect negative battery cable. Disconnect electrical connector from oxygen sensor. Carefully remove oxygen sensor from exhaust pipe.

1. Whenever an oxygen sensor is removed, coat threads with anti-seize compound before installation. New oxygen sensors already have this compound applied to threads.
2. Install oxygen sensor in exhaust pipe. Tighten oxygen sensor to 30 ft. lbs. (41 N.m). Reconnect electrical connector to oxygen sensor. Reconnect negative battery cable.

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

See also:
• TORQUE SPECIFICATIONS
• FUEL PRESSURE RELIEF