Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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The fuel pressure is controlled by the Fuel pump control module. DO you have a scan tool that you can monitor fuel pump duty cycle and pressures?
If you use scanner and command the pump on what does pressure go to?
will it command 100PSI?
Ok. You commanded 60 and it went to 85? Does your scanner have a fuel rail pressure parameter? What does it show?
So when you commanded 60 it went to 85 on gauge?
What is alcohol % reading? There is a calibration update to address this. see attached.
Can your scanner do an alcohol reset? I suggest updating the PCM with latest calibration