02 Grand am Fuel delivery issues. Relay and fuse good, pump or Passlock?
Hi all, Came out of the store the other day to find my 02 Grand am would not start. Had it towed home and began diagnostics.
Engine cranks great (2.2 ecotec L61) with 95k. Will buck and chug like it wants to start, but stalls out shortly after. Engine shakes violently while stalling. Compression checks our fine, no vacuum leaks, fuel pump fuse is good and I swapped the relay with an identical one.
I suspect fuel pump itself is bad. I cannot hear it click on when key is turned to "on" position, even with my ear next to the tank. But before I replace the pump, I want to make sure it couldn't be related to passlock or anything else unforeseen. Security light does not stay on after failed crank. It stays solid when key is in on position, then turns off after failed crank. So I don't think its the security system. Fuel pump fuse is seeing battery voltage at the fuse compartment, but not sure if its making it all the way back to the pump.
So I have basically narrowed it down (imo) to the fuel pump itself, or the wiring going to the fuel pump. Just wanted to gather a few opinions as to what else it could be before I start working on it. I read a few posts saying it could be ignition cylinder related, but those were mostly pertaining to the passlock sensor.
Open to any suggestions. Thanks in advance!