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  1. N

    Acts like it wants to run but doesn't.

    So with my key on it goes to 52 and then drops to 48 within about 5 seconds
  2. N

    Acts like it wants to run but doesn't.

    Key on it goes to 52 and then drops to 48 within 5 seconds
  3. N

    Acts like it wants to run but doesn't.

    I'm still waiting for a compression tester it'll be here in a little bit.
  4. N

    Acts like it wants to run but doesn't.

    Actually just put a new fuel pump in it last night and well it started backfire about 2 or 3 times and then it stopped still has a slight Miss in it it sticks around 46-48 PSI when I turn the key on it goes to about 52 but then I mean I can't get to the fuel gauge fast enough to see how fast it...
  5. N

    Acts like it wants to run but doesn't.

    I used my scanner and pulsed each injector and they all were 36-39psi. But fuel pressure goes to 52 and then slowly drops. Now I had a problem with the fuel filter line that goes from fuel filter to another regulator or whatever then another line from there to the motor. Well the line from the...
  6. N

    Acts like it wants to run but doesn't.

    My dad seems to think that it has a sticky valve. Yet the fuel pressure is at 46-48 and from what I've read it's supposed to be at 55-62? After replacing the fuel pump and the map sensor it backfired for probably about maybe four backfires and then quit back firing. Yet it still has a slight...
  7. N

    Acts like it wants to run but doesn't.

    It's a 2003 Yukon XL 5.3 l Vin Z. I've already replaced all the fuel injectors new plugs and wires, mass air flow sensor, O2 sensors. It will idle smooth for probably about 30 to 45 seconds then start to slightly miss, then it would start to backfire like every 10 seconds it would hit a...
  8. N

    Acts like it wants to run but doesn't.

    The AC delcos are 41-962
  9. N

    Acts like it wants to run but doesn't.

  10. N

    Acts like it wants to run but doesn't.

    So I've tried new coil pack on cylinder number one and still coming back with PO301 but it's weird because when it starts it will idle decently smooth you can still tell that there's a miss but not bad then in about 10-20seconds it will start idling rougher and start missing bad and then...
  11. N

    Acts like it wants to run but doesn't.

    Question can I put regular fuel injectors in my fuel rails and my motor even though my motor is a flex fuel motor I'm not going to run flex fuel but I was just wondering if I can install regular stock injectors in it?
  12. N

    Acts like it wants to run but doesn't.

    I apologize for that but I needed someone to respond and I wasn't getting any so I posted again. I might be new to this forum but I been a member of gmt400 for good while. So the nbs and LS engines are new to me
  13. N

    Acts like it wants to run but doesn't.

    No I haven't I've been working on it tho I will definitely try that next. But I read somewhere it's not good to check the old fashioned way as in put plug in boot and lay on steel somewhere in engine bay..??
  14. N

    Acts like it wants to run but doesn't.

    My pops used a 9 volt battery and cleaned them all 2 days ago. They all passed his inspection.
  15. N

    Acts like it wants to run but doesn't.

    Left to right 1,3,5,7
  16. N

    Acts like it wants to run but doesn't.

    I'm having some problems I had a had some water getting my gas tank somehow not really sure exactly I've cleaned it all out and I changed the plug change the knock sensors place intake gaskets clean the tank out feel pressure regulator I put new plugs in it started it up and I mean within about...
  17. N

    Acts like it wants to run but doesn't.

    So after I replaced the spark plugs I started it up and ran it for about 5 minutes and it started to run like shit then SES light started to flash and I shut it off rechecked the spark plugs started on number 1 it was ok but number 3 and 7 were black as night. I wiped 7 off so I could see...
  18. N

    Acts like it wants to run but doesn't.

    I've cleaned out the tank blown out all the line cleared all water from fuel system. I've replaced the fuel pressure regulator spark plugs cuz they were fouled out. Replaced the knock sensors intake gaskets leaned the throttle body and fuel injectors. She starts up ran ok for about 10 seconds...
  19. N

    Acts like it wants to run but doesn't.

    Well I've just done that.. and realized my fuel pressure regulator is leaking a little bit popped it off and reinstalled it correctly now it started to start but was really crappy sounding and then died scanned it again and it came back with po200. Pressed the check valve on other side of fuel...
  20. N

    Acts like it wants to run but doesn't.

    I've got a 2003 Yukon XL it had a knock sensor code come up so I ordered knock sensors Delphi knock sensors GM wiring harness fel-pro gasket kit I didn't buy any of the cheap crap. Anyhow the day I got everything in it threw a code po300 which is multiple cylinder misfire. Tore the motor down...
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