I have two, so I can a-b them. Anyhow, One of them has a "stumbling" issue at highway speeds; I'm suspecting EGR issues, whether its a sticking valve or pressure converter (there is also a pressure converter for the wastegate...). It also runs rough with no load, like an occasional miss. This also leads me to suspect the EGR (sticking open?)
I have noticed the fuel mileage is "off" (down by 10-15%) from before this began. I had wondered if it was the fuel change, but with a second car doing the same drive on the same fuel turning the "better" mileage, I'm pretty sure it is not the fuel. The trip is 97mi one way, mostly highway driving, so its not a short-trip or small sample statistic ;) I seem to think that the OM606.962 is a "open loop" emissions system (no sensors on the exhaust, but an air mass meter and electronically controled wastegate/injection pump). Anyhow, how should I go about troubleshooting this issue? I suppose I could swap the pressure converters between the cars and see if the issue disappears (swapping them within the same car did nothing, but I hear they can both go bad at about the same time.) The pressure converters are about $100/ea and the EGR is about $400 (mixing housing with integrated EGR). Does anyone have access to the engine troubleshooting manual (EGR stuff) that might shed some light on this? Thanks -j. -- 1985 300D 1991 Jeep Cherokee 1999 E300Dt (x2)
