Upgrade what???? Fuel pressure a constant 42 PSI all the way through the pull. Fuel pump sounds OK to me. Would expect to see a drop in fuel pressure if the pump were not keeping up.
What is the injector duty cycle?
What is the MAF voltage at max power?
What about the long term and short term fuel trim?
What is the injector duty cycle?
What is the MAF voltage at max power?
What about the long term and short term fuel trim?
The MAF's max voltage is just under 5 volts. At 5 volts, the MAF is metering all of the air it can. Therefore, any additional increase in air flow will not raise the voltage above 5 volts. The PCM will see this as constant air flow. However, the actual air flow is greater. Hence the lean condition.
If the injectors are at max flow, the duty cycle will be > 85 percent.
To diagnose will need to know the MAF voltage and injector duty cycle.
If the injectors are at max flow, the duty cycle will be > 85 percent.
To diagnose will need to know the MAF voltage and injector duty cycle.