Quote:
Originally Posted by walt
Now the engine tries to start for 1/2 second and quickly dies out.
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This is just a starting point. Has nothing to do with the O2/Lambda system. Pull air cleaner cover and filter. Turn key to on but not start. Lift the air sensor arm upwards. You should hear noise indicating fuel pump has engaged and pressure is being applied inside your fuel system. If no noise we can go from there.
Lambda system. Car should start and idle poorly if Lambda/interior fuse is blown. If O2 connector is disconnected it will run fine and probably idle smoother than if connected.
There is a connector on the back rail between the shocks. It's a 12 pin, not the bigger 14 pin you may have stressed. There are circuits in that cluster that give power to the frequency valve and probably control a few other Lamda box related controls (say, an off idle switch or WOT switch) that change how the frequency valve controls fuel.
That said, if something is mechanically compromised (squished/broken) in that connector it may allow a short to occur when switched power is applied blowing the fuse. Just take a peek at that connector and see if it look like it has integrity. It's hard to get a good look. Maybe a mirror/flashlight.
You may want to pull off the cube relay on the Lambda box and start the car to see if the fuse does not blow. If it does blow issue is more than likely upstream of the Lambda box.