EGR Failures / Check Engine Light illuminating
The Exhaust Gas Recirculation Valve (EGR) is part of the emmissions system on the CRD engine and what it does is redirect exhaust gases into the intake to cut down on the emmission of particulates and oxides of Nitrogen. The EGR valve controls this recirculation of gases, and is activated via electronic inputs from the ECU.
The owners of CRD's in the USA report many EGR failures, and this all stems from their use of low quality 500 parts per million sulfur Diesel. This burns with a lot of soot and plugs up the EGR valve which stops it opening. When it stops working a CEL (Check Engine Light) illuminates on the dash and it has to be replaced.
We are lucky here in Australia, in that we have high quality diesel fuel (especially BP Diesel with <50 parts per million sulfur content - in fact I believe they are releasing <10 ppm diesel now) which burns much cleaner and therefore doesn't soot up the EGR nearly as quickly - with very few failures reported in Australia.
Interesting to note is that all modern diesels have this EGR system so the KJ CRD's EGR valve is no more likely to fail than that of any other manufacturer due to excess soot buildup.
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2005 KJ CRD Cherokee Extreme Sport with extras Pics
Last edited by Wilmo; 30-03-2007 at 11:35 AM.
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