Pyrometer quit working

[Clinton]

My pyrometer was going in and out for a few weeks, now its totally stopped working. The sensor is in the manifold. Everything looks fine. What is the most likely cause? Thanks.

 

[Bob Wagner]

loose or contaminated leads



Need more details, brand, length of time in service etc

 

[Clinton]

The guage is an Isspro (is that the sensor too? I don't know very much about it). The truck is a '96 with 80K miles. I bought it in 2000 with 28K miles and it was on there when I got it. I traced the wires and all looks okay. There is a splice with a heat shrink shield that I'm guessing is some sort of thermo coupling, but it seems intact. Like I said it started going in and out for a couple of weeks then just stopped recently.

 

[Bob Wagner]

have you removed the t/c from the manifold to check the tip?



You will need an OHM meter to check the t/c for continuity/resistance if the tc is one piece

 

[illflem]

The splice is under the heat shrink shield you found. It seems like something else because the splices are made with two eye connectors joined with a small screw, somewhat large. Cut the heat shrink off and check it out, most likely the problem is where the wire enters one of the crimp on connectors.

 

[J@NWC]

I have had 2 probes go bad the 1st pyro went to 0 and stayed the other droped apro 400 deg and just read low. Great for EGT reduction hard on parts

 

[moparguy]

As Illflem suggested, cut the heatshrink out, loosen and re-tighten the connectors, bet that fixes it. I've had to do this to mine a couple of times.



Next time, it's the solder gun cure.