bad ecm

[jamesrulz]

Has anyone had bad ecm. I think I do because my fan runs all the time and it leans out and doesn't respond to O2 signal quickly. I replaced the O2 not the issue I have a afr gauge on it and it goes lean but the computer doesn't respond. I can drive part throttle and the engine dies and comes back back and forth fuel pressure and ignition are good. Anyone have a issue like this or have any input?

[Paiute3]

Trace all your wiring from O2 switch all the way back to the ECM. Look for rubs that could cause shorts in your 02 harness.

We had a similar problem with our T4 and the wire was rubbing on the starter and all of our wires had melted together in the 4 wire harness.

Also the dealer let us pull our ECM and he put it in a new trooper just to make sure it was not a ECM problem. Good Luck.

George

[troopert24x4]

Hey I am having a similar issue but I think it might be a water problem. I put electric di grease on all of the connectors and I still have the same problem.

[jamesrulz]

Ya its the computer its sealed up tight like a screen door. My dealer changed them before just like dropping your phone in the water. I tried it all to and I am a mechanic its the computer buddy almost positive got one coming