X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost06.isp.att.net ([207.115.11.56] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with ESMTP id 5477510 for flyrotary@lancaironline.net; Wed, 11 Apr 2012 13:41:42 -0400 Received-SPF: none receiver=logan.com; client-ip=207.115.11.56; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-98-85-145-87.mco.bellsouth.net[98.85.145.87]) by isp.att.net (frfwmhc06) with SMTP id <20120411174105H06006rl40e>; Wed, 11 Apr 2012 17:41:06 +0000 X-Originating-IP: [98.85.145.87] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: Mixture graph on EM-2 Date: Wed, 11 Apr 2012 13:41:10 -0400 Message-ID: <32F4AC7C103F49E397B126E596D24FFB@Desktop> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0000_01CD17E8.C190B470" X-Mailer: Microsoft Office Outlook 11 Thread-Index: Ac0XPG26REZV7eN/Stq79jvkny3zYQALDrsg X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01CD17E8.C190B470 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 Hi Bill, 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. Tracy Sent from my iPad On Apr 10, 2012, at 11:23 AM, "Bill Bradburry" wrote: 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 ------=_NextPart_000_0000_01CD17E8.C190B470 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

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

 

Hi Bill,

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.

 

Tracy
=
Sent from my iPad


On Apr 10, 2012, at 11:23 AM, "Bill Bradburry" <bbradburry@bellsouth.net>= wrote:

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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