The Mitsubishi Pajero Owners Club®

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As per a couple o requests about what the EGR valve is and what it does this is a copy of a post originally posted by DAVEL400 at POCUK


I know this has been covered but I though I would put this information in as I did in our OZ forum as we have a few people over here than are worried about touching the EGR valve.

The EGR (exhaust gas recirculation) valve is an emission control device to lower the combustion temperature in the engine. A lower combustion means lower NOx (nitrogen oxide) emissions. It accomplishes this by allowing exhaust gases to be recirculated into the intake manifold through a EGR value. The exhaust acts as a inert gas in the combustion chamber forcing the combustion explosion not to be effective as normal because of the presence of this inert gas. Or as some people rationalize it, it "dirtys" the intake air to not burn as well as it should. Ironically, the EGR emission control actually causes an increase HC (hydrocarbon) emissions.

The reason I installed my blockoff plate was that even with the vacuum pipe blocked off the valve could be stuck open, causing the valve to be open at incorrect throttle openings. Theoretically with this mode since the engine is burning more purely a slight increase in power should be seen, though I didn't notice anything significant to confirm this. Also, the intake should run much cooler since no hot exhaust gases are being injected to it, thereby helping the intercooler and having the intake air nicely cooled and dense.

Please feel free to correct me if am wrong

Dave.G
_________________
Dave (dave110)
94 Delica SG 2.8TDI 4WD (L400)
www.delicaclub.com

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also this was postes by myself at pocuk that may help a bit more also
The EGR valve is used to recirculate exhaust gases into the inlet manifold to the turbo to reduce emissions due to the strict emission laws in japan,so basically with a fully working egr you are supplying the turbo with dirty warm air,Most english spec shogun engines dont have the EGR fitted as the emissions here are nowhere near as stringent as in japan,so by blobking it you are technically doing the same as what an english engine is.
Plenty of members here have had them blocked for some considerable time and there has been no detremental effects and i dont think there would be either,all the time the EGR functions correctly then its ok but as soon as you start getting the black smoke and usual symptoms its usually a sign the valve is on its way out so blockin is the best option,by blocking the vavle you then supply good clean cool air to the turbo and thus stop the smokeing and other associated problems,hope that makes sense,and im pretty sure you wont get any detremental effects from blocking,atb

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