How do I Remove the EGR on Vehiclesby Contributing WriterUpdated June 12, 2017
The EGR valve works by recirculating exhaust gases back into the combustion chamber. This produces hotter gases, which allows the engine to burn more cleanly and efficiently. From constant use and hot air flow, EGR valves accumulate carbon and unburned soot on the inside of the diaphragm. They can clog completely, shutting off the hot gas flow. EGR valve failures can cause engine symptoms like stumbling, cylinder misfires and rough idling. If your Vehicles requires a scheduled smog test, non-working EGR valves can cause the Vehicles to fail the emission control test, requiring a repair-replacement and a followup smog check. The Vehicles owner can sometimes clean the EGR valve by spraying carburetor cleaner inside the unit. Vehicles those persons who do not wish to gamble and buy a new replacement EGR valve, removing the old unit can be accomplished with few basic hand tools.
Under The Hood:
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How To Remove The EGR Valve On A Toyota
Place the car in park or neutral with the emergency brake on. Raise the hood. Remove the negative battery terminal. Make sure the engine is cool--the EGR valve sustains heat, and injury can result by handling the part with bare hands.
Locate the EGR valve. It looks like a small diaphragm, with vacuum hoses connected to the top of it. The valve unit will be bolted to the intake manifold. Gently move aside any wires or other hoses, so you have free access to the EGR valve unit.
Disconnect the vacuum hoses from the top of the EGR valve body, by pulling them free, or loosening the clamp that holds them in place (if so equipped). Be sure to mark the hoses in the exact order they were removed. Wedge them aside away from the valve.
Remove the clamp that holds the hot air supply hose to the bottom of the EGR valve body. The clamp will be either a spring-type or a hose-type clamp. Use the slot screwdriver for the hose clamp, or a pair of pliers for the metal spring variety. Gently twist the hot air supply hose from side to side, while pulling in a downward direction. Do not force it--the hose can be brittle from heat exposure, and can break easily. Prop the hose away from the EGR valve.
Spray the EGR valve mounting bolts with solvent spray and let soak for a few minutes. Remove the bolts, using the appropriate size metric socket or hand wrench. Make note of the bolt locations and place them aside.
Use a gasket scraper to clean the EGR mounting surface on the manifold, then wipe with a solvent rag. The mating surface between the valve and intake manifold should be clean and free of debris.
Items you will need
Spray solvent cleaner
Combination wrenches (metric)
Locate the metal tubing that connects to the driver's side exhaust manifold and extends upwards. This tube sends exhaust gas back to the EGR valve. Trace the tube upwards to locate the mounting location of the EGR valve. The location is dependent on the engine size. This is the easiest way to locate the EGR valve.
Loosen the nut that secures the tube to the EGR valve using an adjustable wrench. Pull the tube off the EGR valve.
Unplug the wiring harness that connects to the other side of the EGR valve.
Remove the bolts that secure the EGR valve to the engine. You need a Torx driver to remove the bolts.
Pull the EGR valve off the engine. The valve recesses into the engine so you may have to pull up hard on the valve to break it free of the engine.
Items you will need
Place the vehicle's transmission into park or first gear (manual). Turn off the engine and engage the emergency brake. Open the hood and disconnect the negative battery lead using an 8-mm box-end wrench.
Disconnect the EGR valve's electrical connector. Remove the two 10-mm bolts holding the EGR pipe to the exhaust manifold using a 3/8-inch ratchet, ratchet extension and a 10-mm socket.
Remove the two 10-mm bolts holding the EGR pipe to the intake manifold using a 3/8-inch ratchet and a 10-mm socket.
Remove the two 15-mm bolts holding the EGR bracket to the engine using a 3/8-inch ratchet and 15-mm socket.
Remove the EGR valve and its pipe assembly from the engine as one unit.
Items you will need
8-mm box-end wrench
3/8-inch ratchet extension