New install. First Engine Run. EGTs indicate same exact value

[Taildragger]

Just fired up a new Titan IO-340 with a new Dynon Sjyview install.

before startup all EGTs read ambient temp (about 59F). Fired up engine and EGTs climb. At high idle of around 800rpm within a minute or so the EGTs all climb up to exactly 442-443F and stop there. Won't climb any higher even if power is increased to 1,800rpm and mixture is leaned out.

Upon shutting the engine down they will drop down to ambient after several minutes as normal.

Sensor mappings are correct. EGT sensors are mapped to the correct thermocouple type. Also my CHT temps work as expected.

Strange. What could cause EGTs to go to exactly 442-443F and stop?

 

[SV_Classic]

Don't CHT temps usually top out just above 400? I'd double check your sensor assignments but I'm new to Dynon, reading to learn mostly.

 

[Taildragger]

Don't CHT temps usually top out just above 400? I'd double check your sensor assignments but I'm new to Dynon, reading to learn mostly.

CHTs should read past 500. But I see what youre thinking. My sensor mappings are correct and the leads are wired to the correct type. It's hard to screw up with the leads as they are color coded yellow/red for the CHT/EGT probes.

 

[SV_Classic]

Would mixing the wires up cause that much of an error?

 

[Taildragger]

Just found this old thread from 2017 in the archives. he had the same issue I have. Turned out for him to be a bad EMS. He got a replacement and the EGT values worked as expected.

"limited" EGT and CHT temperatures

Hello Dynon, My setup is full Skyview system with EMS 221, Aerosport IO-375-M1S engine. I have made my 1st flight yesterday, and noticed that all 4 EGT were not reaching normal temperatures, all very low. Today I tried to troubleshoot and found out that all 4 EGT do not go over 475°F, and all 4...

forum.flydynon.com

I may have a bad EMS... hmmm. Need to talk with Dynon.

 

[Taildragger]

Would mixing the wires up cause that much of an error?

wires are definitely not mixed up. I have verified wiring is correct.

 

[SV_Classic]

I understand, just wondering how much of an error would be caused by using the incorrect wires

 

[chriscalandro]

A bad adc in the EMS could do that

 

[Taildragger]

I understand, just wondering how much of an error would be caused by using the incorrect wires

ahhh... thats a good question. would be interesting to intentionally swap two just to see.

 

[Taildragger]

Just spoke with Dynon support. They think a bad EMS may be likely. Shipping me a replacement tomorrow. Will report back after installing the new EMS.

 

[SV_Classic]

good luck with it!

 

[Taildragger]

update - Dynon sent me a new EMS and that resolved the issue.