Almost everything on the vehicle has been replaced/rebuilt. Vehicle ran great, then P0134 (the code number may be wrong but this was the code result bank 1 sensor 1 oxygen sensor) I replaced it, vehicle ran even better. Drove it for 245 total afterwards miles then the tach jumped and dropped to 0 and the vehicle failed to start hasnt started since.

 

Does it crank?

I replaced an O2 sensor on my '92 but what I was doing turned out to be addressing a symptom and not the cause of the failure; a failing fuel injection spider.

Turned out the leakage from the fuel injector was dumping gas directly into the intake causing an over rich condition with lots of carbon build up on the sensor.

 

Spider and pump, relay and filter all new. Fuel pump and relay are delco not delphi.

 

So it does crank but just won't start?

Any other electrical systems not working?

I'd double check that there is pressure in the fuel lines. Can you hear the pump working?

 

Fuel pump and spider litterally brand new. This is definitely electrical. Like the key was just turned off

 

Sounds like a key, fundamental part of the electrical system has failed. You might have to go down to the most basic level and work your way up; e.g. start with the battery and battery connections, any fusible links to primary systems etc. That way you can start to isolate where the problem is.

 

 

ICM, was a ACDelco part Just went bad after 245 miles. No one makes a product worth a crap these days