HELP intake air temp 492.8deg changed everything!

[Rawze]

492.8-F = 256C.

- It could be the turbo inlet temp sensor (or wiring, or voltage supply) acting up?. I know that it is used to assist in calc. of the overall air inlet temps, and if it reads off by too much, the engine will start to do some odd things. The turbo inlet temp should NOT be reading the same as the ambient air temp when the engine it warmed up. It will read quite a bit higher because it reads the inlet temp + how hot the turbo is getting on its face. This is used by the ecm to help estimate the turbocharger heat absorption rate.

- or Maybe an external interference like RF (radio) or other source of noise interference comming from somewhere?.

- or maybe a +5volts sensor supply somewhere getting shorted to +12volts intermittently?.

When did it start acting up?. Maybe some more history on it?.

and are you allowing those morons at the truck wash places spray/clean under the damn hood ?. --- Another big no-no!.

Also, What is the engine ser#?.. and what program is in the ECM?.

.. and is it De-mandate?.
If it is de-mandated, then copy the program out of the ecm and e-mail it to me for a proper review of what someone did in there regardless of it being the issue or not. More than 90% of all programming of this type is quite harmful, it causes progressive damage, and severely shortens overall engine lifespan.