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Re: 89 C 3500 7.4l TBI with issues
Welcome to the board.
Code 44 means the ECM detects the engine is running to lean.
Being that it lacks power with a load, and runs rough, it could be to lean.
Replace the fuel filter.
If it still has a problem after the new fuel filter, then the fuel pressure needs to be tested.
The spec is 9 to 13 PSI with the engine running.
There is no fuel pressure test port.
Fittings need to be installed to test the fuel pressure with the engine running.
There are multiple failures that can causes the TBI trucks to have low fuel pressure other then the fuel pump. It is common for the fuel pressure regulator spring in the TBI unit to break and cause low fuel pressure. It is also common or for the hose that connects the fuel pump, to the sending unit, to leak and cause low pressure.
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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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