code 44 - why?

[den Broeder, Ernst]

Todd,

I had adjusted the injector constant so that it was the same for both chips.

Thanks,
Ernst


At 01:08 PM 5/16/2001 -0500, you wrote:

>Did you put Injectors in for a 350?
>If not did you change fuel pressure and or the code in the chip to reflect
>the injectors flow rate at the current pressure?
>
>I found this on the internet with some useful information. (I'm at work so
>it is the best I can offer)
>
>Hope it helps
>Todd
>
>**********************************************************************************************************
>
>This is the description of a Code 44 as set on GM products It is an
>indication of a lean mixture as indicated by the oxygen sensor readings.
>
>
>Circuit description: The ECM supplies a voltage of about .45 volts between
>the appropriate terminals of the sensor. (If measured with a ten megohm
>DVM, this may read as low as .32 volt). The O2 sensor varies the voltage
>within a range of about one volt, if the exhaust is rich, down thru about
>.10 volt, if exhaust is lean.
>
>
>The sensor is like an open circuit and produces no voltage, when it is
>below about 360 degrees C, 600 degreeF. An open sensor circuit, or a cold
>sensor, causes Open Loop operation.
>
>
>Test description:
>
>
>1.) Code 44 is set when the O2 sensor signal voltage remains below .3 volts
>for 50 seconds or more and the system is operating in "closed loop".
>
>
>Diagnostic aides:
>
>
>The code 44 for lean exhaust is most likely caused by one or more of the
>following:
>
>
>1.) O2 sensor wire - Sensor pigtail may be mispositioned and contacting the
>exhaust manifold.
>
>
>2.) Check for an intermittent ground wire between connector and sensor.
>
>
>3.) Poor ECM to engine block ground.
>
>
>4.) MAF Sensor - A MAF sensor that causes the ECM to sense a lower than
>normal airflow will cause the system to go lean. Disconnect the MAF sensor.
>If the lean condition is gone then replace the MAF sensor.
>
>
>5.) Vacuum leaks can cause a lean condition and/or possibly a high idle.
>Check for cracked hoses a bad gasket or a faulty EGR or PCV Valve.
>
>
>6.) fuel pressure - system will go lean, if pressure is too low. It may be
>necessary to monitor fuel pressure while driving the car at various road
>speeds and/or loads to confirm.
>
>
>7.) Clogged injector or lean injector - perform an injector balance test..
>
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