It takes a large allen wrench on the tensioner.Ħ) Unbolt the power steering pump and move it out of the way.ħ) Remove both valve covers. An 8mm bolt threads into a housing by the water pump.Ĥ) Remove the coolant overflow bottle. These pieces of tubing are pressed into the intake manifold. Now just pull up on the whole rail assembly and wiggle till it comes off as an entire assembly.ģ) Remove hose clamps from the two ends of the bypass hose and separate them from the metal tubing. Three 10mm bolts.ģ) Unplug two connectors, one large one behind the engine and one small one right in front, atop the front valve cover. ĩ) Unplug the spark plug wires from the ignition coil and mark both the wires and the coil terminals where they plug in. The air intake hose is now off, providing a better view of the remaining componentsĨ) Remove the MAP sensor (one 13mm bolt). The valve will just hang there by the rigid pipe that goes to the exhaust. This mounts on the right rear end of the upper intake manifold by two bolts. Move it off to the side.ħ) Remove the EGR valve. There is a hose going to the PCV valve on the front valve cover and another to the manifold itself. It bolts with a 10mm to the end of the upper manifold cover. Three fasteners (10mm) hold it.Ħ) Unbolt the evaporative canister purge solenoid valve. Set off to the side.ĥ) Remove the bracket. Here is a close up view before the air intake assembly is removedģ) Now you can remove the air cleaner duct.Ĥ) Remove the accelerator and cruise control cables from the mounting bracket. This is the before picture of the 3.1L engineġ) Disconnect the negative cable at battery.Ģ) Unplug and mark 8 or 9 electrical connectors from their devices at the top firewall side of the engine. I recently completed a more detailed post on the similar 3.4L engine. I successfully completed the job on 2001 Buick Century. This is a difficult job, so I took detailed notes and digital pictures to help. The original lower intake manifold gaskets will leak and then the gaskets must be replaced.
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