OEM 2001 GMC Safari Intake Manifold

2001 GMC Safari Parts Questions & Experts Answers

• Q: How to replace the lower intake manifold on 2001 GMC Safari?

  A: The process of replacing the lower Intake Manifold begins with battery cable negative disconnect and removal of the engine cover. Start by draining the cooling system before you can remove the air cleaner assembly along with the outlet duct attached to the Throttle Body assembly. Begin by detaching the accelerator control cable from the throttle shaft and bracket while separately removing the cruise control cable from the throttle shaft and bracket if present. Remove the PCV Valve Hose assembly from the Intake Manifold and valve rocker arm cover before you remove the nut connecting the a/c hose bracket and engine wiring harness bracket to the Intake Manifold stud. Remove the electrical harnesses for the A/C Compressor clutch and a/c high pressure cutoff switch and the tp sensor, idle air control motor and fuel meter body and manifold absolute pressure sensor and evap canister purge solenoid valve and EGR Valve. Pull out the ground wire from the water outlet stud and disconnect the engine wiring harness bracket from the evap canister purge solenoid valve stud before securing engine wires in an accessible location. The technician should detach the evap canister purge valve and radiator inlet hose along with heater hose and water pump inlet hose from the Intake Manifold as well as any attached vacuum hoses. Unscrew the bolt which anchors the transmission fluid filler tube to the accelerator control cable bracket before extracting the bracket from the Throttle Body and Intake Manifold. Detach the Distributor then separate the fuel supply lines and return pipes from the Intake Manifold rear before taking out the ignition control module (ICM). Detach the EGR Valve inlet pipe which extends between the intake and exhaust manifolds. You must first take off the Drive Belt and A/C Compressor side brace after which you can loosen the Power Steering Pump rear bracket nut and remove the oil filler tube bracket bolt and tube. The power steering mounting bracket gets its bolts and nut removed while the A/C Compressor and Power Steering Pump stay on the bracket. This creates access to the front Intake Manifold bolt by sliding the Power Steering Pump bracket forward. Clean all sealing surfaces on the lower Intake Manifold before removal. Perform replacement when needed by completing both disassembly and assembly operations. Installation requires placing the lower Intake Manifold and adjusting the Power Steering Pump mounting bracket before installing all three bolts and nut with 41 nm (30 ft. Lbs.) torque. Install the A/C Compressor side brace and bolts, tightening the side brace bolt to 50 nm (37 ft. Lbs.) installation requires a torque setting of 25 nm (18 ft. Lbs.) for one bolt while the remaining bolt requires 50 nm (37 ft. Lbs.). Install the oil filler tube and bolt, tightening to 25 nm (18 ft. Lbs.)the Drive Belt installation process should commence now. The EGR Valve inlet pipe together with evap canister purge valve and fuel supply and return pipes need to be reinstalled. For proper Distributor installation start by positioning the engine at top dead center of cylinder one then remove the Spark Plug from cylinder number one followed by rotating the Crankshaft into compression stroke and aligning marks (1,4) on the balancer to (2,3) on the front cover before reinstalling the Spark Plug and Distributor. The icm should be installed together with the accelerator control cable bracket while tightening all nuts and studs to 12 nm (106 inch lbs.). Install all hoses in their proper sequence starting with the vacuum hose and then transmission fluid fill tube followed by water pump inlet hose before heater hoses and finally radiator inlet hose. Reconnect all engine wiring harnesses in order to the A/C Compressor clutch , a/c high pressure cutoff switch , tp sensor , iac motor , fuel meter body assembly connector , map sensor , evap canister purge solenoid valve , and EGR Valve . Install the ground wire and nut to the water outlet stud, tightening to 19 nm (14 ft. Lbs.), then install the nut and engine wiring harness bracket to the evap canister purge valve stud (8 Nm/71 inch lbs.) twist the stud on the Intake Manifold to a torque value of 12 nm/106 inch lbs. If equipped, install the nut and a/c hose bracket to the Intake Manifold stud (5 Nm/44 inch lbs.)install the PCV Valve Hose assembly by connecting it to both the Intake Manifold and valve rocker arm cover. The installation of cruise control and accelerator control cables occurs once the procedure ends. To complete the oil change procedure, one must add coolant to the system and connect the air cleaner outlet to the Throttle Body before installing the air cleaner assembly along with reconnecting the battery negative cable and fitting the engine cover.