False high pyro reading???

'07 W900, C15 475 Acert, twin turbos and turned up to 550 HP, 18 speed, 3:36 rears.

Truck has been running really good lately pulling A-Train hoppers up to 142,500 gross... Usually about 110,000 though.

Tonight headed home empty as I got off the interstate I noticed my pyro was sky high (about 1300) and red warning light on. Took it really easy for about 5 miles to a place to get pulled off the road c.ame down to about 1100... Anything above a high idle the pyros would climb back up.

No discernable smoke by sight or smell. Let it cool to about 800 then shut it off, shut off clean... No dieseling. Counted to 20, turned key on and let guages do thier sweep, pyro settled on 850. Cranked up the engine, clean start, pyro immediately dropped to 350 and then came down to 300. Rolled the hood, no evidence of excessive heat (flex pipe behind turbo normal color, spit on flex pipe and it slowly evaporated) pyro sensor and wire intact. Acted fine the 20 remaining miles to home, even when I really leaned into it. Ive never seen this truck go over 1000 on the pyro, even when pulling hard and heavy.

Dieing Sensor? Electrical gremlins?

@AModelCat any thoughts?

 

Kinda what I thought too. If wire is rubbing its deeper in than I wanted to dig on the side of the road... Its Definetally not laying down on the pipe or manifold that I could see.