GLHS

My pyro is bouncing all over the place.
This is a mechanical guage from Banks. How do I test to find out if it's the thermolecoupler(sp?), lead wire or the guage?

Kurt

Tuckerdee

Any of the bouncing related to bumps in the road?

Not sure how the innards of the gauge is built...but a Pyrometer is basically a very sensitive volt meter. The thermocouple generates a voltage based on temperature different by using two different materials. So it's either a connection, or the movement (like a watch's movement) in the gauge is caphlooey.

Here's what I'd do...

Try and reproduce the bouncing of the gauge by bending the wires, jiggling the wires, pulling, etc. You can check the voltage, without the gauge, at the wire ends with a voltmeter. Based on this chart, the voltage should be around 12 or 13 mV (that's millivolts, so .013 volts) at 600* EGT. This is sort-of-normal cruising speed. If this voltage is steady, then I think you've got a gauge problem.

Ace

Check for good ground between the engine block and body.

bob4x4

I have seen way too many Banks pyros fail prematurely,just swap it out for a Danin

Bob

GLHS

Swap out the entire gauge or just the thermocouple?

I'll do some testing tomorrow.

JoeLee

boB4X4 could get you a new Pyro and thermocouple any color AND for $50.00 more he can color match the bezel to your Truck...

JoeLee...

Dean Snow

my ground was bad on mine. so while im waiting for a new one to be shipped i just wrapped a wire around the thermocouple and grounded it to the battery. seemed to fix it jumping around till the new one gets here