Question 1

How to replace the lower intake manifold on GMC Acadia?

Accepted Answer

The replacement process starts with the removal of fuel injectors and Fuel Rail and then continues with the removal of lower Intake Manifold bolts. You need to remove both the lower Intake Manifold and its gasket from the engine before discarding the gasket. Before installing a new lower Intake Manifold gasket you should clean and check both the Intake Manifold and sealing surfaces. After finishing with the lower Intake Manifold bolts application you should reinstall the Fuel Rail together with its fuel injectors. Proceed to torque the bolts at 23 n.m (17 lb ft).

Question 2

How to replace the intake manifold on LH6, LMG, LY5, and L76 engines on GMC Sierra 1500?

Accepted Answer

The replacement process for lh6, lmg, ly5 and l76 intake manifolds begins by removing the air cleaner outlet duct followed by removal of the generator. The engine harness retainer nut needs detachment followed by removal of the retainer from the stud and locator. First disconnect power cables from the evap canister purge solenoid followed by the MAP Sensor and ignition coil harness and the left and right side fuel injectors and throttle actuator and ect sensor. Secure all engine harness branches to the side and move them away from the work area. You should first move the Brake Booster Vacuum Hose aside and disconnect the evap canister purge tube and fuel feed line quick connect fittings when needed. After removing the Intake Manifold you should discard the old gaskets and use adhesive foil to protect the cylinder head openings from entry of debris. To replace the Intake Manifold pull off first the Brake Booster Vacuum Hose nipple followed by the upper Intake Manifold cover and MAP Sensor and Throttle Body but discard the Throttle Body Gasket along with the Fuel Injector lower o-ring seals. Place new Intake Manifold gaskets while installing the Intake Manifold and apply sequence torque values to all bolts during installation. Reinstall all three components - the Brake Booster Vacuum Hose and fuel feed line and evap canister purge tube. Affix all engine harness connectors as well as retainer and clips while making sure each attachment point is secured. Reinstall the generator as well as the air cleaner outlet duct into position.

Question 3

How to replace the intake manifold on GMC Yukon?

Accepted Answer

High voltage service disconnect and disconnection of the battery ground cable must both occur before starting the Intake Manifold replacement. The installment of manifold replacement demands the removal of three components: air cleaner outlet duct, engine harness retainer nut and engine harness retainer from stud and locator pin. The engine harness electrical connectors must be disconnected from seven crucial components: evap canister purge solenoid, manifold absolute pressure sensor and ignition coil harness in addition to left side fuel injectors, throttle actuator and right side fuel injectors and engine Coolant Temperature Sensor. Unplug the generator control module electrical connector while using zip ties to fasten the engine harness branches above the work area. You must separate the evap canister purge tube from its quick connector as well as the fuel feed tube from its quick connector. First remove the positive crankcase ventilation (PCV) hose followed by loosening the Intake Manifold bolts (512) until you can extract the Intake Manifold (500). Protect the cylinder head passages while discarding and removing new Intake Manifold gaskets (514). Clean and inspect the Intake Manifold. Start by removing the upper Intake Manifold cover nut and the upper Intake Manifold cover then remove the MAP Sensor retainer and the MAP Sensor and discard the MAP Sensor seal. First disconnect the fast release of the evap tube at the Intake Manifold then release the retainer for the evap canister purge solenoid while removing the Throttle Body together with its gasket. Remove the Fuel Rail bolts before lifting the rail evenly to extract all injectors. The lower o-ring seals on the fuel injectors need immediate disposal. Begin by applying clean engine oil to new Fuel Injector lower o-ring seals before installing them onto the injectors. Then fasten the Fuel Rail to 10 nm (89 lb in) torque. Place a fresh Throttle Body Gasket onto the Throttle Body assembly with bolts/nuts secured to 10 nm torque (89 lb in). After installation of the evap tube and purge solenoid you must secure the solenoid to the Fuel Rail bracket before you connect the evap tube quick connect fitting at the Intake Manifold. Use engine oil to lubricate the MAP Sensor seal after which you should install the sensor along with a fresh seal and fasten it with the retainer. Begin by tightening the upper Intake Manifold cover and nut before adding new Intake Manifold gaskets (514) and removing the cylinder head passage covers to install the Intake Manifold (500). Apply a 5 mm (0.20 in) band of threadlock gm p/n 12345382 (Canadian P/N 10953489) to the Intake Manifold bolts (512) threads, install the bolts finger tight, and tighten them to specifications: the bolt torques start at 5 nm (44 lb in) during the first stage then finish at 10 nm (89 lb in). Position the pcv hose before connecting the fuel feed line quick connect fitting to the Fuel Rail as well as the evap canister purge tube quick connect fitting to the evap canister purge solenoid. Attach the engine harness electrical connector to the ect sensor before installing the engine harness clip to the generator bracket and tightening the bolt to 9 nm (80 lb in). The installation requires connecting the generator control module electrical connector along with the engine harness electrical connectors to the right side fuel injectors before installing the engine harness clip onto the ignition coil bracket stud. Route the engine harness electrical connectors for left side fuel injectors and ignition coil harness electrical connector before placing the cpa retainer. The engine wiring harness electrical connector should be attached to both MAP Sensor and evap canister purge solenoid before the engine harness retainer can be installed with a nut torque of 5 nm (44 lb in). Complete the high voltage service connect after reinstalling the air cleaner outlet duct and reattaching the battery ground cable.

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