X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-qc0-f180.google.com ([209.85.216.180] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with ESMTPS id 5477528 for flyrotary@lancaironline.net; Wed, 11 Apr 2012 14:05:10 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.216.180; envelope-from=rwstracy@gmail.com Received: by qcsd15 with SMTP id d15so770541qcs.25 for ; Wed, 11 Apr 2012 11:04:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:references:from:content-type:x-mailer:in-reply-to :message-id:date:to:content-transfer-encoding:mime-version; bh=RCvIKa+CFMypzHJZF2SGu05eHp8yTpb7PLF4xYKD/aU=; b=lKfh5vZz3rM57XBkBZt5NQHN95gGELxH/wM9d1JI1LkLcU8fJfNvByOhbQm3YRDF1m tjXvEQs9cp3T5UC38d59X8/tSKOEuL9iZ1HFKlOCW3W6i+HbBaJKrFdSF0okZH5EFLHd Om2Q3zuzT3VKD5Q1sdqPVB7wP8bzGUOmhFRJ15r/o6s/CrahHLiJ/aJ9JHS3SGc7QFAp GZN4tc465ceGFSslMV6YPYEP0VieMhDjjsBmR6Br+AbwZ8pG3hdJ8oRa98FEvl9TSuar 90rDko1OH4sZZBh9llPXD2+jnXrkczScfmVZm9Fwy6qNiAvnARZ4wHKhPIvDHFfX/VxC quWQ== Received: by 10.224.184.70 with SMTP id cj6mr20996897qab.77.1334167473976; Wed, 11 Apr 2012 11:04:33 -0700 (PDT) Return-Path: Received: from [192.168.1.2] (59.sub-166-248-64.myvzw.com. [166.248.64.59]) by mx.google.com with ESMTPS id h16sm6908182qad.5.2012.04.11.11.04.30 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 11 Apr 2012 11:04:32 -0700 (PDT) Subject: Re: [FlyRotary] Re: Mixture graph on EM-2 References: From: Tracy Content-Type: multipart/alternative; boundary=Apple-Mail-33--622014458 X-Mailer: iPad Mail (8F191) In-Reply-To: Message-Id: <2F6ACAF5-8E84-437C-B14D-8D9DC2E82FC7@gmail.com> Date: Wed, 11 Apr 2012 14:04:27 -0400 To: Rotary motors in aircraft Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (iPad Mail 8F191) --Apple-Mail-33--622014458 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Two possibilities: 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 t= hink it is. Only you are in a position to find out which it is. Tracy Sent from my iPad On Apr 11, 2012, at 1:41 PM, "Bill Bradburry" wro= te: > Tracy, > =20 > 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 cente= r (8 of 16 bars lit) with the engine not running. I removed the O2 sensor s= o it was not grounded, no change, I disconnected the wire to the O2 sensor, n= o change, I then hooked up a wire from the sensor input to ground, no change= ! > =20 > New update: Today with the sensor input grounded and the mixture bar at m= idscale, I turned on the fuel pump. The fuel pressure went to 40 lbs, the f= uel bar graph went to 2 bars above mid-scale, and the mixture graph pegged o= ut at the top. This happened with the mixture input grounded. All of the ot= her indications looked normal. I think this means there is an internal prob= lem with the EM-2. Are there other tests that you recommend? > =20 > Thank you, >=20 > Bill B > =20 > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Be= half Of Tracy > Sent: Tuesday, April 10, 2012 1:07 PM > To: Rotary motors in aircraft > Subject: [FlyRotary] Re: Mixture graph on EM-2 > =20 > Hi Bill, > First, be aware that O2 sensors do not work properly when cold so the read= ing means nothing when the engine is not running. > =20 > Try this test: Connect the o2 sensor connection to ground and see what t= he 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. > =20 > Tracy >=20 > Sent from my iPad >=20 > On Apr 10, 2012, at 11:23 AM, "Bill Bradburry" w= rote: >=20 >> Hi Tracy, >> =20 >> I talked with you several weeks ago about my mixture graph going to max a= nd staying there. I just got the plane out of the paint shop and started tr= ying to look at the problem.=20 >> =20 >> The graph stays maxed out and stays there when the power is turned on. I= t is not affected by removing the O2 sensor from the exhaust so that it is n= ot grounded. This is all when the engine is not running and is cold. What a= re the failure modes that could cause this? I don=E2=80=99t think that it i= s coming from the sensor since it is the same when it is cold and ungrounded= . >> =20 >> I know you mentioned bad grounds before, but I can find nothing wrong wit= h grounds. Everything else works that I know of. >> =20 >> Ideas please! >> =20 >> Bill B >=20 --Apple-Mail-33--622014458 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
Two possibilities:
1.  T= he 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

Sent from my iPad

On Apr 1= 1, 2012, at 1:41 PM, "Bill Bradburry" <bbradburry@bellsouth.net> wrote:

Tracy,

 

Yesterday when I taxied the plane aroun= d 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 f= rom 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 b= ars above mid-scale, and the mixture graph pegged out at the top.  This happened with the mixture input grounded. All of the other indications looke= d 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: Mixt= ure graph on EM-2

 

Hi Bill,

First, be aware that O2 sensors do not work properly when cold so th= e reading means nothing when the engine is not running.

 

Try this test:    Connect the o2 sensor connection to grou= nd 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@be= llsouth.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 turn= ed on.  It is not affected by removing the O2 sensor from the exhaust so t= hat 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=E2=80=99t think that it is coming from the sensor since it is the same w= hen 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

= --Apple-Mail-33--622014458--