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Old 01-08-2020, 03:55 PM
Gary2418 Gary2418 is offline
Join Date: Oct 2012
Location: Strathmore, Alberta
Posts: 11
Default EFIS issues

I have an RV7 with a GRT HS EFIS in it as well as an infinity grip.. In the last few weeks I notice I get wildly high readings on all my CHT and EGT,s when I push to talk on my stick. Once I stop transmitting the temps all drop back to normal. My thoughts are a ground issue somewhere but the setup has been working since 2011 and I have not changed anything. I only have the grip on the left side so I am unable to transmit with any other push to talk to see if the problem is in the stick itself. Any ideas.

I am also looking to upgrade my GRT HS EFIS to a GRT HX EFIS if anyone has one for sale.

Thank you,

Gary Abel
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Old 01-08-2020, 04:14 PM
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Mike S Mike S is offline
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 14,926

Originally Posted by Gary2418 View Post

I am also looking to upgrade my GRT HS EFIS to a GRT HX EFIS if anyone has one for sale.

Thank you,

Gary Abel
Sure do.

8.4" HX --------- will PM you.
Mike Starkey
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Rv-10, N210LM.

Flying as of 12/4/2010

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"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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Old 01-09-2020, 12:43 AM
BobTurner BobTurner is online now
Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,159

Check the com coax, especially the braid to ground plane connection.
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Old 01-09-2020, 07:13 AM
pilot2512 pilot2512 is offline
Join Date: Aug 2007
Location: Spring, TX
Posts: 423

What Bob said and also take antenna off and make sure it has a good bond to A/C ie no corrosion between ant and skin. Best if you can have someone do a VSWR test on the coax.
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Old 01-09-2020, 09:02 AM
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ClayR_9A ClayR_9A is offline
Join Date: Jan 2005
Location: Dallas, TX
Posts: 171

Are you using the GRT EIS for your sensors? It then transmits the readings for display in the EFIS.

I have that setup, and when my Princeton fuel senders went bad and caused a short, all the OTHER sensor values went crazy. For example, my voltage reading showed 24v even though it was 12v. CHTs and EGTs also showed values out of range.

The correlation with transmitting only is interesting, but my guess is some kind of short somewhere-- probably involving the radio/antenna or PTT.
Clay R- RV9A - Flying since 2004 - 400 hours
VAF dues paid through end of 2020.
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