Fix It

Removing the EGR valve from the 2.8-liter diesel engine in a Jeep Liberty can be time-consuming. Fortunately, with a little effort and a lot of patience, you can do it yourself and save on an otherwise large repair bill. The EGR valve is located on the back of the engine, just below the intake manifold on the drivers side of the engine. The valve bolts in place with four 8-millimeter bolts that are hidden below the manifold, so you will not be able to see them.

Instructions

1

Open the hood of your Jeep and locate the negative battery cable on the battery. Loosen the pinch bolt with a wrench then lift the cable off the battery and set it aside.

2

Position a catch basin under the passengers side of the radiator and remove the petcock from the radiator tank, allowing the coolant to drain from the system. Once the coolant has stopped draining, replace the petcock.

3

Remove the bolts from the top of the engine cover on the engine, using a socket and ratchet. Lift the cover off the engine and set it aside.

4

Locate the EGR valve on the back of the engine near the drivers side head. Remove the clamps from the cooling lines on the EGR valve then pull the two coolant lines off the valve.

5

Remove the four 8-millimeter bolts from the EGR valve with a wrench then separate the valve from the engine block. A ratcheting wrench may be necessary to remove the 8-millimeter bolts.

An EGR valve is a factory sealed unit, so it cannot be re-manufactured, but the problems associated with a failing EGR valve can be solved by replacing the unit. The EGR valve (exhaust gas recirculation valve) is usually found near the exhaust manifold but can also be found elsewhere on transverse engines. The purpose of an EGR valve is to burn exhaust gases a second time to aid in emissions and help fuel economy. When defective, an EGR valve causes poor acceleration and rough idle. A defective EGR valve often makes a flutter noise.

Instructions

1

Locate the EGR valve. A schematic of the car engine is a great help in locating the EGR valve.The EGR valve looks like a small round can with a small hat on top. A digital EGR valve will have a wire loom connected to it; a manual EGR valve will have vacuum lines connected to it. The base plate of the EGR valve, which is on the intake manifold, is connected to a small metal tube that runs to the exhaust manifold. The EGR valve is easiest to locate by tracing all lines, other than the exhaust pipes that connect to the exhaust manifold. The EGR valve may also may be connected to the EGR solinoid.

2

Remove all parts that obstruct access to the two EGR base plate bolts. Unplug the metal tubes, any vacuum lines and electric connections to the EGR valve.

3

Remove the bolts that hold the EGR valve to the base plate. These bolts are usually 1/2 inch or 12 mm.

4

Install a new factory-sealed EGR gasket. Replace the valve gasket, using gasket sealer prior to re-installation. Torque the bolts to manufacturers specs (approximately 11 to 16 foot pounds).

5

Working in reverse, reconnect all tubes, lines and electrical connections. Replace all other items that were removed to reach the EGR valve.

EGR stands for "exhaust gas recirculation." An EGR pipe is a device used to return some of the exhaust from an engine back into the induction system (Reference 1: Overview).

EGR Pipe Benefits

EGR pipes have two major benefits. First, they increase fuel efficiency, which increases convenience and saves drivers money. Secondly, they produce reduced CO2 emissions compared to engines that lack an EGR valve. This may have a positive influence in retarding climate change.

EGR Pipes for 307 Engines

EGR pipes for 307 engines are a kind of diaphragm valve. These valves operate according a pneumatic or air pressure-powered system.

Matching Engines and Cost

As of February 2011, many makes of car use the 307 engine, and thus can use the EGR pipe made for such engines. These include GM, Chrysler, Ford and Peugeot. The valve is available for approximately 100 Euros or $138.