ArcticMania
NAXJA Forum User
- Location
- Wasilla, AK
Sensor/ECM issues with stalling/black exhaust
I have a 1990 XJ, 4.0 Renix engine. This last summer after going through deep mud up to the rear windows it started running rough and having trouble stalling once it warmed up. It would stay running at high speeds but not trail speeds. We replaced the TPS yesterday. It didn't change anything. They gave us the wrong Coolant Temperature Sensor yesterday and got the right one today(the old one was definately bad). After changing it, it ran fine for a while then suddenly ran extremely rich with black exhaust and died then would not restart until it cooled down. We changed the rotor, cap, wires, and plugs along with the fuel filter while it cooled down since these needed to be done anyways. It continued to run very rich and die. We traced down several melted wires to the Coolant Temperature Sensor, O2 Sensor, and Knock Sensor. This may be why it suddenly died (from movement & shorting out) but the wires had been melted for a while. After fixing the wiring it continued to run very rich with black exhaust and die and now it won't even start after the initial second or two of running. We think it is either the O2 sensor or the ECM. We'll try that later. There does not appear to be any vacuum issues and the MAP sensor seems to be working.
Anyone have any other ideas?
I have a 1990 XJ, 4.0 Renix engine. This last summer after going through deep mud up to the rear windows it started running rough and having trouble stalling once it warmed up. It would stay running at high speeds but not trail speeds. We replaced the TPS yesterday. It didn't change anything. They gave us the wrong Coolant Temperature Sensor yesterday and got the right one today(the old one was definately bad). After changing it, it ran fine for a while then suddenly ran extremely rich with black exhaust and died then would not restart until it cooled down. We changed the rotor, cap, wires, and plugs along with the fuel filter while it cooled down since these needed to be done anyways. It continued to run very rich and die. We traced down several melted wires to the Coolant Temperature Sensor, O2 Sensor, and Knock Sensor. This may be why it suddenly died (from movement & shorting out) but the wires had been melted for a while. After fixing the wiring it continued to run very rich with black exhaust and die and now it won't even start after the initial second or two of running. We think it is either the O2 sensor or the ECM. We'll try that later. There does not appear to be any vacuum issues and the MAP sensor seems to be working.
Anyone have any other ideas?