wr= ote: > Hi Tracy, >=20 > =20 >=20 > I talked with you several weeks ago about my mixture graph going to max an= d staying there. I just got the plane out of the paint shop and started try= ing to look at the problem.=20 >=20 > =20 >=20 > 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 no= t 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 > =20 >=20 > I know you mentioned bad grounds before, but I can find nothing wrong with= grounds. Everything else works that I know of. >=20 > =20 >=20 > Ideas please! >=20 > =20 >=20 > Bill B --Apple-Mail-25--711866434 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

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: &= nbsp;Connect the o2 sensor connection to ground and see what the monitor ind= icates. It should be at minimum or no reading at all. Or, &nbs= p;you could start the engine and see what happens. Tell me what happe= ns.

Tracy

Sent from my iPad

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

<= /div>

Hi Tracy,

I talked with you several weeks ago abo= ut my mixture graph going to max and staying there. I just got the plane o= ut of the paint shop and started trying to look at the problem.

The graph stays maxed out and stays the= re when the power is turned on. It is not affected by removing the O2 sen= sor from the exhaust so that it is not grounded. This is all when the engi= ne is not running and is cold. What are the failure modes that could caus= e this? I don=E2=80=99t 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!<= /p>

Bill B

= --Apple-Mail-25--711866434--