Question: Pyrometer

[Mike_S]

I have an itermitently failing autometer pyrometer gauge. Not sure if it is the probe or the gauge, but it does seem to follow drive/boost pressure, making me think that its the probe. The behavior is that when im on the throttle the gauge rises as normal, but at about 800 degrees it dumps back down, and ocasionally completely freaks out and goes absolutely crazy. The gauge will read normally at times, which is what is getting me, there is not a consistant failure mode here.

Anyone know of a way to test the probe and/or gauge without just buying a new expensive probe and going through that expensive process of elimination/parts changing?

 

[JoshH]

I had a similar problem, and it was a ground issue. I moved the ground wire, and the problem went away. I would check the wire for a bad crimp or something.

 

[Mike_S]

Good point on the grounds. Checked them today and everything seems good. Does anyone know about testing the gauge or probe?

 

[cdbright]

That was happening to mine when it started to go out, the probe was one unit with the gauge so I had to replace the entire thing, it was an "autometer but I replaced it with a colored one and like it better

 

[keith2500hd]

looks like the probe should measure in Mv from 0 to 40 or 75+- (from type k probe off internet, not autometer's), should be constant rise as heated up. did you take apart and clean grounds or just wiggle test. i clean and apply antiseize to help conduction.