I really have to wait for mod approval before I post

[Nate154]

Pressure with car on is 51; with car turned over: 43-44; and with FPR hose removed: 52-53. After the car was off, it held 51 for 6-7 minutes before dropping to 50. After 15 minutes, I went out and it was 45 psi.

Do these suggest fuel pump or FPR problem?

The car, 3.4 w/215K, as been sputtering up hills intermittently and hesitating. Also, sounds like a missing, popping sound at idle.

 

[melsg5]

what year is the car is and do you have a check engine light on? Have you eliminated that the cause may be ignition related? Bad coil pack, wires, plugs etc.?

 

[Kevlar]

The numbers you've posted suggest that the FPR is doing it's job. You're testing at idle I presume. The fuel pump could be providing enough fuel/pressure for that demand but not enogh at higher RPMs. This has happened to me before.

You can test the pump with a flow test. Ot should fill 16 oz of volume in 20 seconds.

 

[Nate154]

what year is the car is and do you have a check engine light on? Have you eliminated that the cause may be ignition related? Bad coil pack, wires, plugs etc.?

It's a 2000. No codes at the moment. I'm not sure how to test the coil packs. I know it has AC Delco platinum plugs, with about 20k on them and on the wires.

______________________________

 

[melsg5]

there are a number of diagnostic links for that engine

http://easyautodiagnostics.com/ignition_gm/ign_module_test_1.php

http://easyautodiagnostics.com/gm_coil_pack/gm_coil_packs_1.php