98 Eclipse ECU Issues?

[TurboTylerT]

I picked this car up and it has always had a missfire and according to an obd2 scan. But recently I noticed that my power windows didn't want to work one night. I turned the lights on and the horn honks steady. If I turn the park lights on or full they will stay on until I disconnect the battery. I unhooked the horn. The A/F on the wideband started hitting 16:00 and the car doesn't want to pull itself out of a hole. All in the same night I also noticed that the heater blower motor doesn't work anymore along with the interior lights and everything else listed. The dash lights went out for 5 seconds or so trying to get it home. It use to idle high before this at around 2400 now it doesn't want to hold idle higher than 1k before it drops to 400 when it warms up. Before this nightmare of a night I realized the fans werent kicking on and the car would get hot. I replaced the temp sensor and checked all other cooling problems but that wasn't the problem. On that terrible night the temp gauge doesn't work just as It did one time before changing it. The whole time i've had the car it has killed the battery flat in like 4 hours. I have checked all grounds and for broken wires ect and the battery & alternator are good as they get. Is this the ECU going bad eventually to where it has totally flipped out on this one night? Thanks for reading and any help is very appreciated.

98 Eclipse GST Spyder 83k miles.

 

[jayson427]

Find a junk yard ecu for cheap and change it out and see What happens That's about all you can do unless you run a voltage meter and check everything out.

 

[mcrae_06]

ECMtuning has a pretty informative writeup on this.

Also, there was a similar thread here on tuners.

 

[luv2rallye]

Windows, lights, horn, blower motor, dash lights are all not controlled by the ECU. Still sounds like bad ground connections.