Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Where do you want to start on this one?
Do you want to test fuel pressures?
Do you want to inspect the spark system to make sure it is strong enough?
Did you change the fuel pump harness when you changed the pump (they are notorious for going bad)?
What was the injector upgrade you performed?
Plugs and wires?
Here area couple of areas to check (I am assuming you have a multi-meter and a basic scan tool):
1. Disconnect the Mass Air Flow (MAF) sensor and reset the fuel trims using the scanner and re-road test.2. Re-road test and see if the power comes back and see if the fuel trims are 0 +- 10.3. If the power comes back and fuel trims are OK, clean or replace the MAF sensor.4. If no change, install a fuel pressure gauge and monitor fuel pressure under acceleration.5. Pressure should be a minimum of 60 PSI under load or Wide Open Throttle (WOT).6. If pressure does not achieve this, try blocking off the fuel return line and see if the pump is capable of 90-100 PSI.7. Verify power and ground to the fuel pump, make sure it is not dropping out slowing the pump down.
Fuel trims should be a value between -10 and 10. It ranges based on throttle position. If it's out of those ranges than something is adding too much fuel or air.
When you reset the fuel trims you are forcing it to pull new info into the long term fuel trim data.
You can reset it with the scan tool or by disconnecting the battery for 30 minutes.
Please let me know if you need any additional information.
I just wanted to see if you need more help. Please don't forget to rate.