flyrotary@lancaironline.net Mailing List Archive

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