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Re: 89 K2500 Lean (Code 44)
Anything that causes it to run to lean, or causes the ECM to detect that it is running to lean, will set the code 44.
A dirty fuel filter.
Low fuel pressure.
Melted or damage insulation, allowing the o2 sensor wire to come in contact with metal, grounding the circuit.
Exhaust system leaks ahead of or near the o2 sensor can allow extra air to reach the O2 sensor causing the code.
A.I.R. Air Injection Reaction (smog pump) system valve failure – on vehicles with this equipment.
A bad O2 sensor can cause a code 44, but usually a bad o2 sensor will set a code 13.
Voltage must remain below .1 volt, while in closed loop operation, for a specific amount of time (which this time specification varies greatly from system to system)
Does the truck have A.I.R. – (a smog pump)?
Drive it until the problem shows up and then unplug the O2 sensor and see if it runs better with the sensor unplugged.
This will help reveal if it is really to lean or if the ECM thinks it is to lean and is making it go to rich.
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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