fuel regulator question?

[jimmywhite]

I have a 97 Jimmy that quit running 2 days ago. It would crank but not run. It had spark at the coil and over 60 fuel pressure. I tore it apart and checked the injectors and each one sprayed gas when I cranked it over. After putting it back together it would run but would stall every 5 to 15 minutes. It would start after a few minutes and then stall again later. So my question is...
Can the fuel pressure regulator or spider by intermittent? Or is there something I am missing?

[old_master]

Connect a fuel pressure tester to the service port. Watch fuel pressure when it stalls: Pay close attention if it loses fuel pressure and stalls, or stalls and then loses pressure. Typically the injectors and regulator either work, or they don't.

Key ON, engine OFF, pressure must be 60psi to 66psi and it must remain above 55psi for at least 10 minutes after the pump shuts off.

After it stalls and will not start when cranking, if you spray carb cleaner in the air intake, will it start and stall?

Do you have a good blue, not orange, spark at each spark plug while cranking?

Are there any DTC's in memory or pending?

[jimmywhite]

Originally Posted by old_master

Connect a fuel pressure tester to the service port. Watch fuel pressure when it stalls: Pay close attention if it loses fuel pressure and stalls, or stalls and then loses pressure. Typically the injectors and regulator either work, or they don't.

Key ON, engine OFF, pressure must be 60psi to 66psi and it must remain above 55psi for at least 10 minutes after the pump shuts off.

After it stalls and will not start when cranking, if you spray carb cleaner in the air intake, will it start and stall?

Do you have a good blue, not orange, spark at each spark plug while cranking?

Are there any DTC's in memory or pending?

Hi,
Pressure was good every time it was tested but I never had the tester in place when it stalled.
It did stay above 55 after the pump stopped without the engine running.
During the first day when it wasn't starting I could pour gas in the thottle body and it would run until it burned off.
Blue spark.
Few different codes.
0122 is the latest. TPS voltage. I did change the TPS today.
It hasn't stalled but does act sluggish along with the code.
Earlier codes:
Coil voltage
O2 sensor
TPS both high and low voltage.

Thanks for the info about the injectors and regulator. I feel better about that.
Thanks,

[old_master]

If adding fuel allows it to start, (and stall) it's an indication that fuel pressure is being lost. This is probably what's causing it to stall. You need to connect the pressure tester and watch it closely when it acts up to confirm that it is in fact losing fuel pressure. If the fuel pressure drops before it stalls, the next step is determine if the pump is losing voltage, or the pump is mechanically failing.