ECM
 

I have a 90 Volvo 740GLE with the B234F engine. It is dumping fuel. I changed all the logical things without help. Took it to Volvo, and they said all they could do was start changing parts. I believe the computer is causing the problem. Any ideas where I can get a new or used computer for my Volvo??? Thanks.... Automatic tranny...

RE: ECM
 

Do you mean dumping fuel litterally or just that it's burning fuel too fast?

RE: ECM
 

Junk Yard but make sure all the Numbers match.

Also so you replaced the Mass flow,o2 sensor,Coolant temp sensor,?

RE: ECM
 

Running very very rich. I can crank it up, shut it off, pull the plugs and they will be covered with soot. I checked the sensors, but did not change them. Would the sensors cause it to run that excessively rich? I changed the plugs, wires, cap, rotor, fuel pressure regulator, and tested the sensors. It just seems like something is telling it too dump fuel. It does it cold or hot, doesn't matter. I was thinking the O2 shouldn't have an effect on the engine when it is cold. Just trying to narrow the problem down, and getting kind of frustrated...

RE: ECM
 

The o2 will have an affect when cold.

My guess would be either o2 or mass flow sensor.