GM 17113542 Manifold Asm,Upper Intake

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The intake manifold tuning valve (CMFI) is checked and replaced as needed.

The first step is to disconnect the cable from the negative battery terminal to ensure electrical safety.

First off, disconnect the negative battery cable. For 1994 and 1995 VIN Z models, take out the upper fan shroud, air cleaner assembly, drain the cooling system, and disconnect the radiator as well as heater hoses. Also disassemble the spark plug wires, coil and distributor by unbolting emission relays bracket and remove rear braces from drive belt tensioner, remembering to mark relationship of distributor rotor with respect to other parts before removal. Disconnect the fuel lines at TBI unit; remove accelerator cables, cruise control cables, TV cables from manifold; detach vacuum brake booster pipe; label manifold lines & wires and remove them. Move up EGR hose whilst loosening manifold mounting bolts. Prying front of manifold loose after removing all bolts for that purpose is now allowed. In case of 1996 or later models you will need to start from taking out upper fan shroud then move on to air cleaner assembly followed by draining cooling system plus disconnecting upper hoses from radiator as well as heater. Next unbolt EGR valve and take off ignition coil carefully. Remove small brace between intake manifold & AC compressor then turn engine to TDC for number one piston-prior to removing distributor. Old gasket material must be removed to guarantee clean mating surfaces during re-installation; apply RTV sealant if necessary. Be sure new gaskets are properly aligned when putting in place new intake manifold while sealant is still wet on it. Proceed accordingly tightening recommended sequence's bolts once more when finished reverse remaining steps beginning with starting engine thereafter checking for leaks.

For removing the intake manifold, start by disconnecting the negative battery cable and draining the cooling system. Then take off air cleaner assembly, throttle body (if intending to resurface or replace the manifold), alternator rear brace, and on air-conditioned models move the compressor out of the way by removing brackets. Next is to unfasten ESC module bracket located on side of manifold, remove idler pulley rear bracket, and label as well as disconnect all fuel lines, wires and vacuum hoses connected to intake manifold looking for interference with other components like transmission dipstick tube, EGA system, PCV system and power brake lines. Detach upper radiator hose from thermostat housing cover and if present disconnect heater fitting in intake manifold. Distributor and ignition coil wires should be removed. Unbolt mounting bolts incrementally until they can be removed by hand with care not to harm gasket sealing surfaces. Pry bar can be placed underneath cast-in lug near thermostat housing to assist in prying up front of manifold when it sticks. Ensure cylinder heads, block and manifold mating surfaces are immaculately clean before installing; this entails removing any sealant or old gasket material using a gasket scraper and wiping surfaces with lacquer thinner or acetone. Remove shop rags covering lifter valley so that no dirt enters engine; then take a tap followed by compressed air to clean bolt holes. Apply thin coat of ATV sealant around coolant passage holes located on cylinder head side of new intake manifold gaskets; position them on cylinder heads being mindful of correct alignment as well as orientation. Front and rear end seals must be installed on 7.4L V8 engines while a 3/16-inch bead of ATV sealant is applied to each corner of end seals where they meet gaskets. Tap threads in bolt holes with correct size tap and apply Loctite 242 or equivalent threadlocker to threads on manifold bolts before installing and torquing bolts to the specified torque sequence. Finally, perform the reinstallation steps in reverse order, start the engine, and carefully inspect for oil, vacuum, and coolant leaks at the intake manifold joints. Disconnect negative battery cable; drain cooling system on 1996 and later models with upper intake manifold removal. Remove air cleaner assembly, ducts, any interfering wiring, throttle and cruise control cables and brackets as well as fuel lines (V6 and small-block VB engines). Coil and bracket also should be removed while PCV hose from EGR inlet tube purge solenoid connectors is removed together with any interfering spark plug wires from 7.4L V8 models. To install upper intake manifold, position gasket and manifold; then tighten bolts in two steps using a criss-cross pattern followed by other installation steps in reverse order.

Detach the Electronic Spark Control (ESC) module bracket on the side of the manifold, remove the idler pulley rear bracket, and label and disconnect any fuel lines, wires, and vacuum hoses connected to the intake manifold. Check for interference with other components such as the transmission dipstick tube, EGA system, PCV system, and power brake lines.

You should tag and disconnect all electrical connectors at the throttle body and manifold.

You should remove the old gasket and transfer all components still attached to the old manifold to the new one.

Ensure clean mating surfaces by removing old gasket material and applying RTV sealant as needed. Install new intake manifold gaskets, making sure they align correctly, and set the manifold in place while the sealant is wet. Tighten the manifold bolts in the recommended sequence, then proceed with the remaining installation steps in reverse order, starting the engine and checking for leaks.

Ensure clean mating surfaces by removing old gasket material and applying RTV sealant as needed. Install new intake manifold gaskets, making sure they align correctly, and set the manifold in place while the sealant is wet. Tighten the manifold bolts in the recommended sequence, then proceed with the remaining installation steps in reverse order, starting the engine and checking for leaks.

You should tag and disconnect all electrical connectors at the throttle body and manifold.

Remove the two rear braces from the drive belt tensioner, unbolt the emission relays bracket, and proceed to remove the spark plug wires, coil, and distributor, marking the distributor rotor's relationship before removal. Disconnect the fuel lines at the TBI unit, remove accelerator, cruise control, and TV cables from the manifold, detach the vacuum brake booster pipe, and label and disconnect various lines and wires at the manifold and TBI unit. Move the EGR hose and begin loosening the manifold mounting bolts, followed by prying up the front of the manifold after removing all bolts.

USE PART# 12550027 X8 PER VIN#