Provided your engine has recently overheated, you may demand to examine your manifold for cracks.
Whether your 2003 Chevrolet 3.4 Litre engine has recently overheated, then you may consideration a inferiority of influence or problems such as backfiring from your vehicle's ignition and Glimmer systems. Govern the hood and peep your manifold for lurking cracks or leaking gaskets. The intake manifold is the ribbed, rectangular Element that is at the other cusp of the throttle target and air filter box meeting. Disconnect the vacuum lines from the upper intake manifold assembly and unscrew the ignition coil bracket and coil assembly.5. Use a socket wrench to unscrew the upper intake manifold, double-checking to make sure that all connections are disconnected from the manifold before removing it.
Provided your vehicle cannot be driven, lift it using a floor jack placed underneath the Centre of the engine and a place of jack stands placed underneath either side of the front doors. Compass a receive pan subservient the radiator and handle a socket wrench to unscrew the radiator empty plug, draining the coolant fluid from the radiator. Disconnect the rejection battery cable.
2. Commit to paper on strips of masking tape in cast to flash the Correct connections for all components that are required to be disassembled before enchanting apart sensors, wires and fasteners from your engine in establishment to access your manifold. Everyone strip of tape should term the articulation with another strip of tape designating the address of the branch or connexion.
3. Unscrew the air intake meeting and air filter box from the engine using a screwdriver and socket wrench. Disconnect the electrical harness from the succeeding sensors and valves: intake air temperature (IAT), throttle position sensor (TPS), sluggish air bridle (IAC), manifold positive vigour (MAP), exhaust Gauze recirculation (EGR) camshaft position (CMP) and the engine coolant temperature (ECT). Unscrew the hose clamp connecting the air filter box to the throttle body. Remove the throttle and cruise control cables by unscrewing their brackets from the throttle body's assembly.
4. Disconnect the thermostat bypass hoses from the throttle body and lay the hoses into the catch pan. Disconnect the spark plug wires from the intake, being sure that you label each wire and its location. The location of the intake manifold is to supply extension for the initial atomization of fuel and air for the combustion channels.
Instructions
1. Uplift your 2003 Chevrolet on a locate of machine ramps.6. Use a socket wrench to disconnect the screws for the rocker arm covers. Unscrew the fuel injector fasteners with a socket wrench and lay aside the fuel injector's wiring harness. Pinch-off the fuel lines and disconnect them from the injector assembly, using cork pieces to plug each line. Remove the fuel rail and the injectors from the lower manifold.
7. Use a socket wrench to disconnect the mounting bolts for the power steering pump and set it aside with the power steering fluid lines still connected to the pump. Disconnect the coolant bypass hose and the coolant inlet pipe from the coolant outlet housing, laying the hoses in the catch pan. Disconnect the upper radiator hose from the thermostat unit's housing.
8. Disconnect the mounting bolts for the lower intake manifold.
9. Reassemble the intake manifold using the reverse of the removal process. Tighten the vertical bolts on the manifold before tightening the diagonally placed bolts. Use automotive silicone to help seal the mounting surface between the gasket that connects the upper and lower manifold plenums.
10. Use a torque wrench to tighten the manifold mounting bolts to 23 foot-pounds. Tighten the power steering pump's mounting bolts to 25 foot-pounds.
11. Reconnect the negative battery cable after all other parts are reassembled. Turn the ignition key to the on position, allowing the engine to run for five seconds. Turn the engine off and allow it to set for ten seconds. Repeat this pattern of five seconds on and ten seconds off for two more cycles, which will prime the fuel system. Turn on the engine and check the manifold assembly for fluid leaks.
