Engine Removal GMC Suburban R1500

TROUBLE SHOOTING

Note. To trouble shoot engine mechanical components, see appropriate table in TROUBLE SHOOTING article in GENERAL INFORMATION.

"M" Series

1. Place transmission gear selector in Park (Neutral on manual transmissions). Set parking brake and block drive wheels. Loosen fuel filler cap to relieve tank pressure. Disconnect 3-terminal electrical connector at fuel tank. Start engine and allow to run until engine stalls due to lack of fuel. Crank engine for 3 seconds to remove any fuel pressure left in fuel lines. Fuel lines are now safe for servicing. WARNING: To avoid possible personal injury and fire danger, fuel pressure must be relieved as outlined in step 1).
2. Disconnect negative battery cable. Drain cooling system. Remove engine cover. Remove headlight bezel, grille and hood latch mechanism. Remove radiator lower close-out panel and radiator support brace. Remove lower tie bar and cross brace.
3. Remove radiator hoses, transmission cooler lines (if equipped), upper core support and filler panels. Remove radiator and fan shroud as an assembly. Separate engine wiring harness at firewall connector. Disconnect wiring harness at ECM and pull through firewall.
4. Disconnect heater hoses at heater core. Remove accelerator cable, cruise control and detent cables (if equipped). Disconnect ground strap at cylinder head. Remove oil filler neck and thermostat outlet. Remove air cleaner and canister purge hose. Raise vehicle. Separate exhaust pipe at manifold. Disconnect wiring harness at transmission and frame.
5. Remove starter and flywheel inspection cover. Disconnect and plug fuel lines. Remove motor mount through bolts and bellhousing bolts. Lower vehicle. Attach engine hoist. Support transmission and carefully remove engine.

"S" & "T" Series

1. Place transmission gear selector in Park (Neutral on manual transmissions). Set parking brake and block drive wheels. Loosen fuel filler cap to relieve tank pressure. Disconnect 3-terminal electrical connector at fuel tank. Start engine and allow to run until engine stalls due to lack of fuel. Crank engine for 3 seconds to remove any fuel pressure left in fuel lines. Fuel lines are now safe for servicing. WARNING: To avoid possible personal injury and fire danger, fuel pressure must be relieved as outlined in step 1).
2. Disconnect negative battery cable. Remove hood and air cleaner. Disconnect power steering reservoir at fan shroud. Remove upper fan shroud and fan. Drain cooling system. Remove radiator hoses and transmission oil cooler lines at radiator. Remove radiator.
3. Unbolt A/C compressor and power steering pump and set aside. Disconnect fuel line bracket at filter. Disconnect and plug fuel lines. Label and disconnect all vacuum hoses. Disconnect accelerator, cruise control and throttle valve cables. Remove heater hoses from engine.
4. Disconnect O2 sensor wire. Label and disconnect all electrical connectors on engine. Raise vehicle. On 2WD, remove strut rods, flywheel cover, and drive belt splash shield (if equipped). On 4WD, remove crossmember after disconnecting brake line clip. Separate transmission cooler lines from flywheel cover. Remove drive shaft at front axle. On all models, disconnect exhaust pipe at exhaust manifold. Remove starter and flex plate-to-converter bolts.
5. Remove 2 outer air dam bolts (left side). Remove lower fan shroud and left side body mounting bolts. Install jack stands. Raise and support left side of body. Remove upper transmission mounting bolts. Lower body.
6. Remove remaining transmission mounting bolts. Remove motor mount through bolts. Lower vehicle. Support transmission. Lift engine and remove wiring loom bracket at rear of cylinder head. Remove engine.

"S" Series (2WD)

1. Place transmission gear selector in Park (Neutral on manual transmissions). Set parking brake and block drive wheels. Although fuel pressure drops to zero when ignition is turned off, loosen fuel filler cap to relieve tank pressure. To further minimize risk of fire and personal injury, cover surrounding areas with a shop rag while removing fuel lines. WARNING: To avoid possible personal injury and fire danger, fuel pressure must be relieved as outlined in step 1).
2. Disconnect battery. Remove hood and air cleaner. Drain cooling system. Remove radiator hoses, transmission cooler lines (if equipped) and upper fan shroud. Remove radiator and fan and heater hoses. Label and disconnect all vacuum hoses at engine. Disconnect throttle cable and cruise control cables (if equipped).
3. Disconnect ground wires and cables, main feed wires and any necessary wiring at firewall. Remove distributor cap. Raise vehicle. Disconnect exhaust pipe at converter and both manifolds. Remove strut rods, flywheel inspection cover and torque converter bolts.
4. Remove converter hanger at exhaust pipe and rear shield. Disconnect fuel lines and hoses. Remove 2 outer air dam bolts and lower fan shroud. Remove left body mount bolts and raise body to remove bellhousing bolts. Lower body and remove motor mount through bolts.
5. Disconnect A/C compressor and power steering pump from engine and set aside (if equipped). Attach lift equipment to engine. Support transmission and carefully remove engine from vehicle.

"T" Series (4WD With Automatic Transmission)

1. Place transmission gear selector in Park (Neutral on manual transmissions). Set parking brake and block drive wheels. Although fuel pressure drops to zero when ignition is turned off, loosen fuel filler cap to relieve tank pressure. To further minimize risk of fire and personal injury, cover surrounding areas with a shop rag while removing fuel lines. WARNING: To avoid possible personal injury and fire danger, fuel pressure must be relieved as outlined in step 1).
2. Remove hood. Disconnect battery and underhood light. Raise vehicle. On utility vehicles, remove body mounts. On chassis cab models, loosen and remove 2 front body mounts. On all models, remove front air dam end bolts.
3. Raise body above frame and remove top transmission-to-engine bolts. Lower body to frame. Remove remaining transmission-to-engine bolts. Unbolt and remove No. 2 crossmember. Disconnect exhaust pipe at manifolds. Disconnect catalytic converter hanger.
4. Remove front drive shaft at differential. Remove bellhousing cover. Unclip automatic transmission cooler lines at engine. Remove motor mount bolts and flex plate-to-converter bolts. Remove front splash shield (if equipped) and lower fan shroud. Lower vehicle.
5. Drain cooling system. Remove upper fan shroud and radiator hoses. Disconnect automatic transmission cooler lines at radiator. Remove radiator, fan, and air cleaner. Remove A/C compressor and power steering pump from engine and set aside (if equipped).
6. Disconnect fuel lines and hoses. Disconnect vacuum and emission hoses from engine. Disconnect accelerator, throttle valve, and cruise control cables (if equipped). Disconnect engine wiring harness at firewall.
7. Disconnect heater hoses at engine. Disconnect any remaining wiring from engine. Attach hoist to engine and support transmission securely. Remove engine.

"T" Series (4WD With Manual Transmission)

1. Place transmission gear selector in Park (Neutral on manual transmissions). Set parking brake and block drive wheels. Although fuel pressure drops to zero when ignition is turned off, loosen fuel filler cap to relieve tank pressure. To further minimize risk of fire and personal injury, cover surrounding areas with a shop rag while removing fuel lines. WARNING: To avoid possible personal injury and fire danger, fuel pressure must be relieved as outlined in step 1).
2. Remove hood and air cleaner. Disconnect battery and underhood light. Drain cooling system and remove upper fan shroud. Remove radiator hoses, fan and clutch. Remove radiator.
3. Remove A/C compressor and power steering pump (if equipped). Disconnect fuel lines and hoses. Remove vacuum and heater hoses at engine. Disconnect accelerator and cruise control cables. Disconnect engine wiring harness, main feed wire, and ground strap at firewall.
4. Remove lower fan shroud. Disconnect battery ground at engine. Remove distributor cap and diverted valve. Remove shifter boot and console cover. Remove transfer case shifter and transmission shifter.
5. Raise vehicle. Remove front and rear skid plates. Remove front splash shield. Drain transfer case and transmission. Remove rear drive shaft. Disconnect speedometer cable and front drive shaft. Disconnect shift linkage and vacuum hoses at transfer case.
6. Disconnect parking brake cable. Remove rear mount and converter bracket. Support transfer case. Unbolt transfer case and remove from vehicle. Remove crossmember. Disconnect back-up light wiring and clip. Unbolt slave cylinder and hang to side. Remove transmission. Remove clutch release bearing and flywheel inspection cover.
7. Remove left side body mounting bolts. Lift left side of body and remove bellhousing. Disconnect exhaust at manifolds and converter. Disconnect clutch cross shaft at frame. Remove starter. Remove motor mount bolts. Lower vehicle. Attach lifting device and remove engine.

1. Place transmission gear selector in Park (Neutral on manual transmissions). Set parking brake and block drive wheels. Although fuel pressure drops to zero when ignition is turned off, loosen fuel filler cap to relieve tank pressure. To further minimize risk of fire and personal injury, cover surrounding areas with a shop rag while removing fuel lines. WARNING: To avoid possible personal injury and fire danger, fuel pressure must be relieved as outlined in step 1).
2. Disconnect negative battery cable. Drain cooling system. Raise vehicle. Disconnect exhaust pipe at exhaust manifolds. Disconnect starter and strut rods at flywheel cover. Remove flywheel inspection cover, torque converter bolts (A/T only) and oil filter.
3. Disconnect harness at transmission and frame. Disconnect and plug fuel lines. Disconnect transmission and engine oil cooler lines at radiator. Remove lower fan shroud bolts. Remove motor mount through bolts and bellhousing bolts. Lower vehicle. Remove headlight bezels and grille.
4. Remove radiator lower close-out panel and support braces. Remove lower tie bar. Remove hood latch mechanism. Disconnect master cylinder and set aside. Remove radiator hoses, fan shroud, radiator and upper radiator core support.
5. Discharge A/C system. Remove radiator filler panels. Remove engine cover and rear brace of A/C compressor. Disconnect A/C hose at accumulator. Remove A/C compressor and bracket. Remove power steering pump.
6. Label and disconnect necessary vacuum hoses. Disconnect wiring harness at firewall. Remove right kick panel. Disconnect wiring harness at ESC module and push through firewall. Remove distributor cap and A/C accumulator. Disconnect fuel line at TBI unit.
7. Disconnect and remove diverter valve. Remove transmission dipstick tube. Disconnect heater hoses at heater core. Remove horn. Remove air injection check valves. Install engine lifting device. Support transmission. Remove bellhousing bolts. Remove engine.

"G" Series

1. Place transmission gear selector in Park (Neutral on manual transmissions). Set parking brake and block drive wheels. Although fuel pressure drops to zero when ignition is turned off, loosen fuel filler cap to relieve tank pressure. To further minimize risk of fire and personal injury, cover surrounding areas with a shop rag while removing fuel lines. WARNING: To avoid possible personal injury and fire danger, fuel pressure must be relieved as outlined in step 1).
2. Remove glove box and engine cover. Disconnect battery and drain cooling system. Remove outside air duct and air cleaner. Remove power steering reservoir bracket, hood release cable and upper fan shroud bolts. Disconnect overflow hoses. Disconnect transmission oil cooler lines at radiator.
3. Remove upper fan shroud, fan and pulley. Remove heater hoses, radiator hoses and radiator. Remove cruise control servo and brake booster vacuum hose at TBI unit. Disconnect accelerator and throttle valve cables. Disconnect fuel line and vacuum hoses at TBI unit.
4. Remove TBI unit and distributor cap. Disconnect air injection hoses at diverter valve. Remove diverter valve. Disconnect PCV valve. Label and disconnect remaining vacuum hoses. Label and disconnect engine electrical harness. Discharge A/C system.
5. Remove A/C compressor brace and compressor. Remove upper half of dipstick tube. Remove oil filler and transmission dipstick tubes. Disconnect and plug fuel lines at fuel pump. Remove power steering pump and A/C idler pulley.
6. Remove headlight bezels and grille. Remove upper radiator support, lower filler panel and hood latch support. Disconnect A/C lines at condenser. Remove condenser. Raise vehicle. Drain engine oil. Disconnect exhaust pipe at exhaust manifolds.
7. Disconnect strut rods at flywheel inspection cover. Remove flywheel inspection cover, starter and torque converter mounting bolts. Remove motor mount through bolts and bellhousing bolts. Lower vehicle. Support transmission. Install lift equipment and remove engine.

All Other Series

1. Place transmission gear selector in Park (Neutral on manual transmissions). Set parking brake and block drive wheels. Although fuel pressure drops to zero when ignition is turned off, loosen fuel filler cap to relieve tank pressure. To further minimize risk of fire and personal injury, cover surrounding areas with a shop rag while removing fuel lines. WARNING: To avoid possible personal injury and fire danger, fuel pressure must be relieved as outlined in step 1).
2. Disconnect battery. Remove underhood light (if equipped) and hood. Raise vehicle. On utility vehicles, remove body mounts. On chassis cab models, loosen front and remove 2 body mounts. On all models, remove front air dams.
3. Remove top transmission-to-engine bolts. Lower body and remove remaining transmission-to-engine bolts. Remove No. 2 crossmember. Remove exhaust pipes at manifold. Remove hanger from catalytic converter.
4. On 4WD models, remove drive shaft at front axle. On automatic transmission models, remove torque converter cover, transmission cooler lines and flexplate-to-torque converter bolts.
5. Remove motor mount bolts. Remove front splash shield (if equipped), lower and upper fan shrouds. Lower vehicle. Drain cooling system. Remove radiator, fan and air cleaner.
6. Remove A/C compressor and power steering pump from engine and set aside (if equipped). Disconnect fuel lines and hoses. Disconnect vacuum and emission hoses. Disconnect engine wiring harness at firewall.
7. Disconnect accelerator cable, T.V. cable (automatic transmission) and cruise control cable (if equipped).
8. Disconnect heater hoses at engine. Attach hoist to engine and support transmission securely. Remove engine from vehicle.

Note. Additional steps may be necessary depending on body style.

4.8L 6-CYLINDER

1. Disconnect negative battery cable. Remove air cleaner and drain cooling system. Disconnect accelerator cable and detent cable (automatic trans.) from throttle lever. Disconnect wiring harness at firewall.
2. Remove radiator hoses from radiator and heater hoses from engine. Remove radiator, fan and water pump pulley. Disconnect fuel line from fuel pump. Disconnect vacuum and emission hoses. Remove hood. Raise vehicle.
3. Remove starter, flywheel or converter inspection cover, and exhaust pipe from manifold. If equipped with automatic transmission, remove converter-to-flex plate bolts. Attach engine hoist and remove weight from engine mount bolts. Remove engine mount bolts.
4. Remove front engine mounting through bolts. Remove bellhousing retaining bolts and support transmission with chain. Lower vehicle and attach engine hoist. Remove engine.

"G" & "P" Series

1. Place transmission gear selector in Park (Neutral on manual transmissions). Set parking brake and block drive wheels. Although fuel pressure drops to zero when ignition is turned off, loosen fuel filler cap to relieve tank pressure. To further minimize risk of fire and personal injury, cover surrounding areas with a shop rag while removing fuel lines. WARNING: To avoid possible personal injury and fire danger, fuel pressure must be relieved as outlined in step 1).
2. Disconnect battery cables and drain cooling system. Remove engine cover, air cleaner and air stove pipe. Remove coolant reservoir, grille, upper radiator support and lower grille valance. Disconnect automatic transmission cooler lines (if equipped) and radiator hoses.
3. On A/C equipped models, discharge system and remove condenser and vacuum reservoir. Remove washer bottle with bracket, radiator brackets, radiator and shroud. Remove power steering pump and set aside (if equipped).
4. Disconnect wiring from firewall connection. Disconnect accelerator cable and remove TBI unit or carburetor. Remove thermostat housing, oil filler pipe and disconnect heater hoses. Remove cruise control servo, transducer, and bracket (if equipped).
5. Raise vehicle. Disconnect exhaust pipe at manifold. Remove drive shaft and plug extension housing. Disconnect shift linkage and speedometer cable. Disconnect fuel and vapor hoses from engine. Remove transmission mount bolts and engine mount bracket-to-frame bolts.
6. Drain crankcase. Raise engine slightly and remove engine mounts. Block up engine with wooden block between oil pan and crossmember. Lower vehicle and attach lift equipment. Remove engine and transmission as an assembly.

1. Place transmission gear selector in Park (Neutral on manual transmissions). Set parking brake and block drive wheels. Although fuel pressure drops to zero when ignition is turned off, loosen fuel filler cap to relieve tank pressure. To further minimize risk of fire and personal injury, cover surrounding areas with a shop rag while removing fuel lines. WARNING: To avoid possible personal injury and fire danger, fuel pressure must be relieved as outlined in step 1).
2. Remove hood, air cleaner, accessory drive belts, fan and water pump pulley. Disconnect battery cables and drain cooling system. Disconnect all hoses, lines, linkage and wiring from engine.
3. On A/C equipped models, remove compressor and set aside. Disconnect transmission oil cooler lines (if equipped). Remove radiator with shroud. Remove power steering pump (if equipped). Disconnect fuel lines. Raise vehicle and drain crankcase.
4. On 4WD models with automatic transmission, remove strut rods at motor mounts. Disconnect crossover pipe from exhaust manifold. Remove flywheel or converter inspection cover and converter-to-flex plate attaching bolts.
5. Remove starter and wiring along right pan rail. Support transmission and remove bolts from engine to bellhousing. Remove lower engine mount bracket frame bolts. Lower vehicle and attach lift equipment. Remove engine.

1. Disconnect batteries. Remove headlight bezels, grille, bumper and lower grille valance. Remove hood latch, washer bottle, upper fan shroud and tie bar, and engine cover. On A/C equipped models, discharge system and disconnect condenser lines and remove condenser.
2. Drain cooling system and remove radiator hoses at radiator. Disconnect engine oil and automatic transmission cooler lines. Remove radiator and fan assembly. Scribe mark on front cover at injection pump flange and remove fuel injection pump.
3. Raise vehicle. Disconnect exhaust pipe at manifold. Remove inspection cover, flex plate-to-converter bolts, and motor mount through bolts. Disconnect block heater and ground wire at element. Remove bellhousing-to-engine bolts and starter.
4. Lower vehicle. Remove cruise control transducer (if equipped). On A/C equipped models, remove rear brace, disconnect lines at compressor, and remove brackets and compressor. Remove power steering pump and set aside (if equipped). Remove oil filler tube upper bracket and glow plug relay. Disconnect oil pressure sender.
5. Remove air cleaner resonator with bracket and transmission filler tube nut. Disconnect heater, radiator and by-pass hoses at crossover. Remove alternator upper bracket and coolant crossover. Disconnect fuel lines at fuel pump. Attach lift equipment and remove engine.

1. Disconnect batteries. Raise vehicle. Remove inspection cover. Disconnect torque converter and exhaust pipe. Remove starter, bellhousing bolts and motor mount bolts. Remove wire harness, automatic transmission cooler lines and front battery cable clamp at oil pan.
2. Disconnect block heaters. Disconnect fuel return and oil cooler lines at engine. Remove lower fan shroud bolts. Lower vehicle. Remove hood and drain cooling system. Remove air cleaner with resonator and primary filter from cowl. Remove harness from clips at valve covers and disconnect glow plugs.
3. Disconnect ground cable at alternator bracket, alternator wires and clips. Disconnect TPS, EGR/EPR and fuel cut-off at injection pump. Disconnect EGR/EPR solenoids, glow plug controller, temperature sender and move harness aside. Disconnect left side ground strap.
4. Remove fan, upper radiator hoses at engine, and fan shroud. Remove power steering pump and belt. Remove power steering reservoir and position aside. Disconnect vacuum at cruise servo and accelerator cable at injection pump.
5. Disconnect heater hose and lower radiator hose at engine. Disconnect oil cooler lines, heater hose and overflow at radiator. Disconnect automatic transmission cooler lines. Remove upper radiator cover, radiator and detent cable. Support transmission and remove engine.

7.4L V8

1. Place transmission gear selector in Park (Neutral on manual transmissions). Set parking brake and block drive wheels. On Throttle Body Injected (TBI) engines, although fuel pressure drops to zero when ignition is turned off, loosen fuel filler cap to relieve tank pressure. To further minimize risk of fire and personal injury, cover surrounding areas with a shop rag while removing fuel lines. WARNING: To avoid possible personal injury and fire danger, fuel pressure on Throttle Body Injected (TBI) engines must be relieved as outlined in step 1).
2. Remove hood and air cleaner. Disconnect battery and drain cooling system. Disconnect radiator and heater hoses. Remove radiator and fan shroud. Disconnect all hoses, fuel lines, linkage and wiring from engine.
3. Without disconnecting lines, remove power steering pump and A/C compressor (if equipped) and support out of the way. Raise vehicle. Drain crankcase and separate exhaust pipe from manifold. Remove starter and torque converter bracket at transmission rear mount.
4. Remove bellhousing cover and flex plate-to-converter attaching bolts. Remove motor mount through bolts and bellhousing bolts. Lower vehicle. Using floor jack, raise transmission. Attach lift equipment and raise engine. Remove motor mount-to-engine brackets. Remove engine.

4-CYLINDER

TORQUE SPECIFICATIONS (4-CYLINDER)

6-CYLINDER

TORQUE SPECIFICATIONS (6-CYLINDER)

V6

TORQUE SPECIFICATIONS (V6)

V8

TORQUE SPECIFICATIONS (V8)