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  #1  
Old 04-21-2022, 11:28 AM
DavidHarris DavidHarris is offline
 
Join Date: May 2018
Location: Upland, CA
Posts: 165
Default Intermittent EGT sensor

I'm having intermittent trouble with my #4 EGT sensor and am looking for advice on whether there might be a simple fix or if it's time to replace.

I'm doing my second condition inspection on a Vans RV7A with a Superior XPIO360 engine and dual pMags and a Dynon SkyView HDX with engine monitor. I've had intermittent trouble this year with the #4 EGT sensor displaying an X on the EMS. I have previously made it go away by unplugging and replugging the spade connector firewall forward linking the EGT probe to the EMS harness.

Last night replugging the spade connector made no difference, but wiggling the spring-like shield around the EGT probe just outside the exhaust line has restored normal operation. This sounds like a marginal connection near the probe tip.

Is there anything to try before buying and install a new probe?

Thank you!

David Harris
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Vans RV-7A N47HM
First Flight March 2020
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  #2  
Old 04-21-2022, 04:16 PM
GlennBfromOz GlennBfromOz is offline
 
Join Date: Jul 2017
Location: Sydney, Australia
Posts: 12
Default

David,

This is a rather common failure mode for the Dynon probes. The very fine wire breaks inside the insulation, usually where there’s a sharp bend as it exits the probe. Unfortunately there’s no fix except to replace it…

..and when you do, also replace all the spade connectors with OLC-2, as the spades are another point of failure. It’s difficult to get a good crimp on that same fine wire.

https://www.aircraftspruce.com/catal...lickkey=711794

Best,

Glenn

Quote:
Originally Posted by DavidHarris View Post
I'm having intermittent trouble with my #4 EGT sensor and am looking for advice on whether there might be a simple fix or if it's time to replace.

I'm doing my second condition inspection on a Vans RV7A with a Superior XPIO360 engine and dual pMags and a Dynon SkyView HDX with engine monitor. I've had intermittent trouble this year with the #4 EGT sensor displaying an X on the EMS. I have previously made it go away by unplugging and replugging the spade connector firewall forward linking the EGT probe to the EMS harness.

Last night replugging the spade connector made no difference, but wiggling the spring-like shield around the EGT probe just outside the exhaust line has restored normal operation. This sounds like a marginal connection near the probe tip.

Is there anything to try before buying and install a new probe?

Thank you!

David Harris
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  #3  
Old 04-21-2022, 09:50 PM
RV7A Flyer's Avatar
RV7A Flyer RV7A Flyer is offline
 
Join Date: Jul 2013
Location: US
Posts: 2,669
Default

I gave up on the spade connectors years ago...tired of fighting them; always seemed to be one failing every 100 hours or so. Went to these and have had zero problems (knock on wood) since.

https://www.omega.com/en-us/temperat...tors/p/SMPW-CC
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Last edited by RV7A Flyer : 04-22-2022 at 11:07 AM.
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  #4  
Old 04-22-2022, 07:50 AM
DavidHarris DavidHarris is offline
 
Join Date: May 2018
Location: Upland, CA
Posts: 165
Default

This is very helpful. Thank you!
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Vans RV-7A N47HM
First Flight March 2020
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  #5  
Old 04-22-2022, 05:29 PM
pilotkms's Avatar
pilotkms pilotkms is offline
 
Join Date: Mar 2007
Location: WARNER ROBINS, GA
Posts: 587
Default +1 Omega

I agree with RV7AFlyer.
I have over 500 trouble free hours since converting to the Omega Connectors.
Search for this - Erratic CHT and/or EGT ? December 2018. Omega details there.
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RV 7A RV #9700 May 2017
N325KS the Flying “K”
Built in SoCal KCCB, now in GA @ KPXE
900+ Hours & 7X cross the USA
OSH flyin 2018 & 2019 & Petit Jean 2019 & 2021
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