Zenith Aircraft Builders and Flyers
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Erratic CHT Reading
I wasn't sure where to post this.
I have a UL 350iS with a Dynon Skyview system with the Dynon EMS in a CH650B. It's all been working fine for 450 hrs but now I'm getting an erratic CHT reading on #4. It usually resolves itself within 10 min of take off but before that I'm seeing readings that jump all over the place from minus 150 degrees to plus 200 and sometimes it reads zero and the CHT label for #4 is x'd out on the screen as if it wasn't there at all. All other CHT's from the other cylinders are fine as are the EGT readings from all 4 cylinders.
I replaced the CHT probe today and still have the problem. I didn't replace the female barrel the probe bayonets into. Maybe that is the problem and causing an erratic ground?
I'm stumped as to what to do next. Any advice would be appreciated. Thanks!
Replies to This Discussion
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Permalink Reply by David R Ferrell on
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Problem solved. I cut out the spade connectors and soldered the wires together and Viola! Working perfectly now.
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Permalink Reply by David J. Beaulieu on
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How were the crimps on the spades - did you take a look at them? 450 hrs on the probe is good in my mind. I've replace two EGT probes on my engine since running it (300 hr plus) and it was obvious the probes that had failed. I do think EGT probes have a harder life than the CHT probes though...
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The entire sensor wiring bundle has been wrapped in fire sleeve since I built the plane 450 hrs ago so the spades looked perfect. But obviously there was an intermittent connection issue on one of them. I prefer solder joints anyway.
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