Mine stays at 24.7” after gradual power reduction below that. It’ll go lower if I abruptly reduce and add throttle and then it hunts upward to catch up, so I’m pretty sure it’s a sensor thing. I was caught by surprise. No reason, I guess. I’ve had round MP instruments fail. I just didn’t expect it and have never heard anyone mention a sensor failure with a glass panel.
G3X MP Sensor Sticking
- Thread starter stewartb
- Start date
The intake port at #3 cylinder. I’ll pull the lines and check for fluid but it isn’t acting like a fluid obstruction. At least it’s not my initial thought. The sensor is mounted vertically in a tee that also feeds MP to the Pmags. I’ll check those lines, too, but again, not expecting to find a problem that causes what I’m seeing. But expectations may be wrong.
frequent_flyer
Registered User
Arizona, USA
Configuration on my FX-3 is the same except LightSpeed instead of Pmags. I have not heard of any problems with the Kavlico MP sensor but anything can fail. How small is the sensing hole on the sensor? Is it clear?
Should be possible to connect a temporary tube to the sensor and cycle it with a vacuum pump (simple hand operated would work) while running GDU and GEA 24 on IBBS (if fitted).
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System inspected. No leaks, no obstructions. The coking thing must be with carb engines. Mine’s FI and the intake port is as clean as it was when installed. Fortunately Spruce had an MP sensor in stock, a welcome surprise given Garmin glass product lead times these days. With the Kavlico snap-off wire caps I don’t even have to mess with crimping 22ga wires in cramped spaces. Unscrew one sensor, screw in the other, plug it in.
Anyone suffering delays in your projects due to Garmin? If you’re thinking of buying Garmin avionics, order it ahead of time. I know of a project that’s dead in the water waiting for a G3X.
Anyone suffering delays in your projects due to Garmin? If you’re thinking of buying Garmin avionics, order it ahead of time. I know of a project that’s dead in the water waiting for a G3X.
frequent_flyer
Registered User
Arizona, USA
Garmin has been unable to supply the GSU 25C ADAHRS for over a year! Don't know what other G3X Touch LRU are unavailable. Andair can't supply fuel pumps either.
Did you test the MP sensor with a vaccum pump?
frequent_flyer
Registered User
Arizona, USA
I was wondering if you had checked the old sensor before you removed it.
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