Cleaning EGT Probe question?

[AaronBND]

I have a dual gauge Koso EGT with the fast sensors. Yesterday while out riding, about 3/4 of the way through the ride the MAG side started showing about 300* less than the PTO side temps. I didn't think much about it because the sled was running like a raped ape as usual. When I got back to the truck, I pulled the probes out of the "Y" pipe and that one side had a little carbon build up on it's tip. Is this normal to have to clean them sometimes? Just wondering what would of caused it? The PTO side looked great. I am pre-mixing at 36:1 now since doing the BDX delete. Anyone have any input? Thanks.

Aaron

 

[hatchers]

nope, you dont need to clean a thermocouple......its just two wires inside that do the magic

 

[letsgoracing]

Egt

Next time out, do a hard run then shut off the engine. Pull both plugs and read the tips. Both should be the same color, light to dark brown. If plugs look OK, then you EGT probe, wires or gauge are bad.

 

[AaronBND]

I did look at plugs and they were fine. Just wondering if you ever had to clean the probes sticking down in the pipe? I'm thinking the carbon build-up on it is probably what was giving it a false reading.

Aaron

 

[007]

I have had to replace them before because one gave me funny readings.

 

[letsgoracing]

Egt

You can try cleaning it, but I doubt that will fix anything. Contact your probe manufacturer and ask for info on how to check the probe. All you need is a propane torch and a good volt-ohmmeter that has a DC Millivolt range.

 

[tonyinak]

I've had luck with cleaning the probes with a blow torch. I burn av-gas, and as a result get lead build up. Hot torch generally burns it up.

 

[Ultra]

swap your probes and see where your problem goes. Should tell you in about two minutes what you have going on.

 

[m8magicandmystery]

often and very often differant egt temps of a significant amount could indicate a power valve issue on one cylinder..and carbon is a real robber of correct sensing..in a boiler 1/8 of an inch of soot really really affects heat transfer

 

[AaronBND]

often and very often differant egt temps of a significant amount could indicate a power valve issue on one cylinder..and carbon is a real robber of correct sensing..in a boiler 1/8 of an inch of soot really really affects heat transfer

I had actually just cleaned the power valves before the ride. I will clean the end and try it again. Thanks guys.

Aaron

 

[Ultra]

My friend, swap the probes in the pipe or on the back of the gauge. If the low temp follows the probe, it's a probe or gauge problem. If the same cylinder still reads low it's an engine problem.
Most likely it will be a probe or gauge problem but doing this will point you in the right direction with 100% accuracy.