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Remove the negative battery cable. Remove the intake manifold sight shield-four nuts. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure in Powertrain Management. Remove the air intake duct from the throttle body. Remove the transaxle vent hose and transaxle shift cable at the bracket. Remove the TP sensor and IAC valve connectors. Remove the accelerator cable and cruise control cable at the throttle body. Remove the front bank spark plug wires and lay them aside. Remove the throttle body coolant hoses at the throttle body and the surge tank pipe. Refer to Throttle Body Coolant Hose Replacement in Cooling System. 10. Remove the EGR pipe and the crankcase ventilation pipe at the throttle body spacer. 11. Remove the brake booster vacuum hose at the intake manifold vacuum fitting. 12. Remove the fuel rail ground wire at the rear cylinder head. 13. Remove the quick-connect fittings at the fuel rail. 13.1. Grasp both sides of the fitting. 13.2. Twist the female connector 1/4 turn in each direction to loosen any dirt within fitting. 1. 2. 3. 4. 5. 6. 7. 8. 9. Caution: Safety glasses must be worn when using compressed air, as flying dirt particles may cause eye injury. Blow the dirt out of the fitting using compressed air. Choose the correct tool from the J 37088-A for the size of the fitting. Insert the tool into the female connector, then push/pull inward to release the locking tabs. 13.5. Pull the connection apart. – Using a clean shop towel, wipe off the male pipe end. – Inspect both ends of the fitting for dirt and burrs. – Clean or replace the components or assemblies as required 14. Disconnect the fuel rail bracket at the EGR valve. 15. Disconnect the PCV hose at the intake manifold. 16. Disconnect the injector harness main connector. 13.3. 13.4.

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Models: 1992-94 Buick Skylark 1993-96 Buick Park Avenue 1989-92 Cadillac Allante 1991-93 Cadillac Eldorado, Seville 1991-95 Cadillac DeVille 1991-95 Oldsmobile Ninety Eight 1992-93 Oldsmobile Achieva 1994-99 Pontiac Bonneville This bulletin is being revised to clarify when this bulletin may be used to turn the service suspension lamp off. Also, a step has been added to the 1991 Cadillac Eldorado and Seville repair. Please discard Corporate Bulletin Number 00-03-11-001 (Section 3 – Suspension). Some owners may bring their vehicles in for service with an illuminated service suspension light. The service suspension indicator lamp is telling the owner that the vehicle is due for strut/shock replacement, a maintenance item. The customer may elect to have passive struts installed in their vehicles due to repair cost savings and/or parts availability. The installation of passive shock/struts will result in handling characteristics which are the equal to a like vehicle without the computer controlled ride, with all other components such as tires, tire pressure, springs, etc. being equal. The installation of (4) new passive struts will cause the continued illumination of the service suspension indicator. If desired by the customer, the service indicator may be disabled AFTER THE INSTALLATION OF THE (4) NEW PASSIVE STRUTS, using the appropriate service procedure listed below. This bulletin DOES NOT authorize this procedure unless (4) NEW PASSIVE STRUTS WERE INSTALLED ON THE VEHICLE.

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Service Engine Soon (SES) Light On, Diagnostic Trouble Code (DTC) P0741, Torque Converter Clutch (TCC) Excessive Slip, Transaxle Chuggle, Slip/Surge (Inspect and/or Replace Various Internal Transaxle Components) 1998-2002 Cadillac Eldorado 1998-2004 Cadillac Seville 1999-2004 Cadillac DeVille 2000-2003 Oldsmobile Aurora with 4T80-E Auto Transaxle (RPO MH1) Some customer may comment on the SES light on and a chuggle or surge. Diagnostics may show excessive TCC slip speed and DTC P0741 will be current code Seal damage may allow the TCC apply fluid to leak into the channel plate, causing excessive TCC slippage under certain conditions, eventually causing no TCC apply.

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Models: 1992-94 Buick Skylark 1993-96 Buick Park Avenue 1989-92 Cadillac Allante 1991-93 Cadillac Eldorado, Seville 1991-95 Cadillac DeVille 1991-95 Oldsmobile Ninety Eight 1992-93 Oldsmobile Achieva 1994-99 Pontiac Bonneville This bulletin is being revised to clarify when this bulletin may be used to turn the service suspension lamp off. Also, a step has been added to the 1991 Cadillac Eldorado and Seville repair. Please discard Corporate Bulletin Number 00-03-11-001 (Section 3 – Suspension). Some owners may bring their vehicles in for service with an illuminated service suspension light. The service suspension indicator lamp is telling the owner that the vehicle is due for strut/shock replacement, a maintenance item. The customer may elect to have passive struts installed in their vehicles due to repair cost savings and/or parts availability. The installation of passive shock/struts will result in handling characteristics which are the equal to a like vehicle without the computer controlled ride, with all other components such as tires, tire pressure, springs, etc. being equal. The installation of (4) new passive struts will cause the continued illumination of the service suspension indicator. If desired by the customer, the service indicator may be disabled AFTER THE INSTALLATION OF THE (4) NEW PASSIVE STRUTS, using the appropriate service procedure listed below. This bulletin DOES NOT authorize this procedure unless (4) NEW PASSIVE STRUTS WERE INSTALLED ON THE VEHICLE.

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VALVE BODIES Disassembly 1. Thoroughly clean and air dry valve bodies. Remove check balls. Remove each valve train. 2. Lay valves, springs and bushings on a clean surface in the order removed. Remove solenoids, sensor, screens, servos and accumulator assemblies.Fig. 26: Exploded View Of Lower Channel, Spacer & Valve Body Assembly Exploded View Of Lo/Reverse Servo & Lower Valve Body Assembly Aligning Channel Plate & Gasket Aligning Lower Valve Body & Channel Plate Aligning Accumulator Assembly