Mooney bravo m20m edm indication

[pkofman]

I have an aspen and g5 plus the original electrical AI. Interestingly today that high pitch Sound disappeared after only. a few minutes.
This plane has a thing about wanting to empty my wallet chasing intermittent issues !!!!  

[PJClark]

I'm a noob and no expert...and I have no idea what the exhaust mainfold looks like on a Bravo.

But--years ago when I owned an M20J I had something similar happen to that airplane--minus the high pitched noise.  One EGT (I think it was #2) suddenly read very low or was just missing/not registering at all at low power settings.  When I pushed it up it was almost normal...and of course the engine ran just fine.

turned out a bolt had broken where that exhaust attached to the cylinder, and enough exhaust to excite the probe only went down the pipe when it had enough velocity--high power settings.  It was an easy fix once found.

so you might check that if you haven't already and if it makes sense for the Bravo arrangement.

PJ

[pkofman]

Just now, PJClark said:

I'm a noob and no expert...and I have no idea what the exhaust mainfold looks like on a Bravo.

But--years ago when I owned an M20J I had something similar happen to that airplane--minus the high pitched noise.  One EGT (I think it was #2) suddenly read very low or was just missing/not registering at all at low power settings.  When I pushed it up it was almost normal...and of course the engine ran just fine.

turned out a bolt had broken where that exhaust attached to the cylinder, and enough exhaust to excite the probe only went down the pipe when it had enough velocity--high power settings.  It was an easy fix once found.

so you might check that if you haven't already and if it makes sense for the Bravo arrangement.

PJ

 

 Hoping for an easy solution.. into the shop soon , thank you

[pkofman]

Resolutions to this problem that may help others';

Item #1 . erratic indication #4 cylinder on edm 700;

So here is the final edm#4 result

It turns our that  odd  ( no bar and  erratic low indication) on the #4 cylinder was caused by a loose connection on the exhaust or where it is measured

They tightened the clamp or bolt and "voila" it worked and is back to normal

Item #2 very high pitched noise

This had nothing to do with the edm, it just unfortunately started at the exact same time

The noise was coming from the T/B indicator gyro.

Unrelated issues but it sent me on a path of discovery

Thank you to all for your assistance and advice

Hope this can help others I the future

Pete

 

[carusoam]

Great follow-up, Pete!

Thanks for sharing the details.

Best regards,

-a-