oldnavy wrote:
Ranger1 wrote:
We are aware of the European GC's. There is also a European Liberty (Cherokee), but the US launch, with it's engine/emissions PCM software totally re-written for US EPA emissions laws, has suffered from the modifications to meet those requirements. It wouldn't surprise me to eventually find out that the transmission shuddering and eventual failure is related to the egr-engine-transmission computer mapping. This is probably why we in the US cannot use the reputation that the European versions of these vehicles enjoy as an indicator of US reliability. Look at the difference in the Euro and US versions of the Cherokee/Liberty in egr/transmission reliability.
There is very little difference in the PCM programming and that may be the actual problem, remember they are even stricter on all accounts then US except CARB and have what we would call ULSD, with Europe averaging <100 ppm of sulfur and most Western European countries have 30 to 50 ppm fuel and that is the real problem. In the VW diesels the PCM were more aggressivly mapped for performance then US cars as were trans controllers, and same is probably true with the tranny in the Jeep. However the Euro models might possibly have the MB W5A/NAG-1 tranny instead of Dodge 545RLE we have in the US, and that really would make a big difference.
I think we we see a lot of improvement in the Liberty CRD when ULSD arrives with it's 46 Cetane fuel. I think that is why some who have problems with the CRD have no prob;lems when using B100 fuel.
It was a VP from jeep who stated that the emissions software maps on the US spec CRD were totally rewritten for US EPA emissions requirements. He claimed the Euro software wouldn't pass any US emissions laws. The stricter NOx emissions means the software written for Euro-spec CRD's wouldn't even meet pre 2007 EPA requirments.
The Euro emissions requirements focus on CO2 reduction more so than NOx and are much more relaxed than EPA on NOx emissions. The amount of EGR gas cycling on Euro models is far less than our US spec models. I know in my case, I'm not interested in any future diesels from DCX until they've fixed the oily CAC issue and dumped EGR as an emissions control device - which probably can't happen if/until SCR (Urea injection aka AdBlue) is approved by EPA.
And speaking of oily CAC messes, I was just looking at GreenCarCongress on their Grand Cherokee V6 diesel announcement - there is a picture of the V6 diesel engine - right there on the left cylinder bank is an almost identical OEM ccv valve that our CRD's have. Hard to believe they would use it again. OldNavy, you might want to see if your new ccv can be adapted to the V6 diesel!