JoeX87000031
04-25-2008, 15:14
I have a 94 K3500 6.5L that has been having electrical problems. I wrote about it in a previous thread with a couple other problems wrapped up with it;
I think I may be confronted with multiple problems. I want to blame the ECM but they hardly ever go bad in my experience. To get to the point, she runs rough with white smoke anywhere from 2200 to 3000. Smooth all other RPM. Here's the kicker. It will only run that good with the coolant temperature sensor disconnected. Once you plug that back in it runs very rough and wont start(actually starts and revs for a split second, then immediately quits.) Pulled 9 codes after running it with the sensor back in. 5 for the Throttle Circuit, and 3 for Cylinder Misbalances. Unlpluged the Sensor and reset the codes, only 1 comes up, that being for the coolant temperature sensor. It's got a new Injector pump. I have already changed the fuel filter and have began to closely inspect the wiring harness. I found what I think was the AC compressor clutch cannon Plug all fried and burnt. Maybe that wasted the ECM? I dont know, but I cant find anything wrong with the wires headed to the coolant temp sensor and the sensor ohms good? Computer should only cost me about 300, anyone else ever ran into something like this?
I have now replaced the injectors, and the CKPS. No luck with the missing. I Ohmed the return wire to the ECM, the 5 volt power line from the ECM to several sensors, what I understood to be grounds for the ECM to the body and the batteries. I checked out the grounding straps when I replaced my injectors and they felt fine.
Thats at lot of info to read about and now see. What I am getting at it that I have established that the coolant temp sensor, wires to and from it, and before and after the ECM are good. A computer costs from 108 to 300. Diagnostics run 95 an hour up here in AK. It costs 100 to flash the computer. I am thinking of just replacing the ECM. Let me know what you think, what you would do. Take care.
I think I may be confronted with multiple problems. I want to blame the ECM but they hardly ever go bad in my experience. To get to the point, she runs rough with white smoke anywhere from 2200 to 3000. Smooth all other RPM. Here's the kicker. It will only run that good with the coolant temperature sensor disconnected. Once you plug that back in it runs very rough and wont start(actually starts and revs for a split second, then immediately quits.) Pulled 9 codes after running it with the sensor back in. 5 for the Throttle Circuit, and 3 for Cylinder Misbalances. Unlpluged the Sensor and reset the codes, only 1 comes up, that being for the coolant temperature sensor. It's got a new Injector pump. I have already changed the fuel filter and have began to closely inspect the wiring harness. I found what I think was the AC compressor clutch cannon Plug all fried and burnt. Maybe that wasted the ECM? I dont know, but I cant find anything wrong with the wires headed to the coolant temp sensor and the sensor ohms good? Computer should only cost me about 300, anyone else ever ran into something like this?
I have now replaced the injectors, and the CKPS. No luck with the missing. I Ohmed the return wire to the ECM, the 5 volt power line from the ECM to several sensors, what I understood to be grounds for the ECM to the body and the batteries. I checked out the grounding straps when I replaced my injectors and they felt fine.
Thats at lot of info to read about and now see. What I am getting at it that I have established that the coolant temp sensor, wires to and from it, and before and after the ECM are good. A computer costs from 108 to 300. Diagnostics run 95 an hour up here in AK. It costs 100 to flash the computer. I am thinking of just replacing the ECM. Let me know what you think, what you would do. Take care.