Hi Bill, My cabin in Colorado is off-grid and I have no means to work on electronics out here so it will be May 8th before I can look at it.
Tracy
Sent from my iPad
Tracy,
The mixture function was working fine last
June. My mother in law fell and airplane stuff went by the way side until
I was going to fly it last January. That is when the mixture graph went
south (north actually since it went up :>))
I will trace out the wire and ensure that
it does in fact go to P2-8, but it looks like I will need to send it in.
Do you have to return from Colorado
before it can be repaired?
B2
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Tracy
Sent: Wednesday, April 11, 2012
2:04 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Mixture
graph on EM-2
1. The EM2 is not working on the mixture function
2. There is a miswire and the O2 input is not really connected
where you think it is.
Only you are in a position to find out which it is.
Tracy,
Yesterday when I taxied the plane around
to the hangar from the paint shop, the mixture graph was maxed out. Today,
the mixture graph is in the center (8 of 16 bars lit) with the engine not
running. I removed the O2 sensor so it was not grounded, no change, I
disconnected the wire to the O2 sensor, no change, I then hooked up a wire from
the sensor input to ground, no change!
New update: Today with the sensor
input grounded and the mixture bar at midscale, I turned on the fuel
pump. The fuel pressure went to 40 lbs, the fuel bar graph went to 2 bars
above mid-scale, and the mixture graph pegged out at the top. This
happened with the mixture input grounded. All of the other indications looked
normal. I think this means there is an internal problem with the
EM-2. Are there other tests that you recommend?
Thank you,
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Tracy
Sent: Tuesday, April 10, 2012 1:07
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Mixture
graph on EM-2
First, be aware that O2 sensors do not work properly when cold so the
reading means nothing when the engine is not running.
Try this test: Connect the o2 sensor connection to ground
and see what the monitor indicates. It should be at minimum or no
reading at all. Or, you could start the engine and see what
happens. Tell me what happens.
Hi Tracy,
I talked with you several weeks ago about my mixture graph going to
max and staying there. I just got the plane out of the paint shop and
started trying to look at the problem.
The graph stays maxed out and stays there when the power is turned
on. It is not affected by removing the O2 sensor from the exhaust so that
it is not grounded. This is all when the engine is not running and is
cold. What are the failure modes that could cause this? I
don’t think that it is coming from the sensor since it is the same when
it is cold and ungrounded.
I know you mentioned bad grounds before, but I can find nothing
wrong with grounds. Everything else works that I know of.
Ideas please!
Bill B
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