I have a 1998 RD688S with an E7400, It wouldn't start, unhook the battery for five minutes then it starts. Now after changing the oil, I started it let the oil pressure build up then it shuts down, has not started since, unhooked battery, no help. I have had a new oil pressure sensor put on (the one on the top of the oil filter) before all this happened. I'm not a mechanic but wonder if these are common problems are not. I do know it is somewhat computerized because I had the top speed increased at a Mack dealer. They are too far away and I'm trying to avoid a big towing bill. Thanks.....Festus
