O2 sensor does nothing at startup.

 

So while looking under the hood for any visible abnormalities, I spotted two unplugged, loose wires. One to the right of the intake manifold (blue) one to the left of the alternator, really long wire(yellow end)
Do you know what any of these do?





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They gotta go somewhere. I am not real familiar with the 4.7 though.... So, no idea what they plug into. Check the wiring harness for any connectors just layin' about.

 

Your thoughts on a crankshaft position sensor?

 

If you are getting spark, the crank sensor is doing its job.

 

So in your opinion, why do you think it idles for two seconds then dies?

 

Well it stay running if you hold your foot on the gas a bit?

 

No, nothing I've tried has worked so far

 

What is fuel pressure doing? If it fires for a couple seconds, then it seems the sensors are working properly.... just something is forgetting what it is supposed to be doing...

 

Fuel pressure is at 48, normal