I just bought this van a few weeks ago and was told that the cat was bad but said that he recently replaced it I was thinking possibly the pre cat but I dont know with it being obd1 it's a big pain i did pull the codes on it and I got a 13 33 and 51 which is coolant temperature sensor heated o2 sensor and something with the fuel injector circuit I have no power and it is difficult to maintain high way speeds and the exhaust is loud I also noticeda plugged hose and one that was not connected that was coming from the top of the trans I believe any help would be greatly appreciated