Recent content by Cj6706

  1. C

    Persistent P0420 and P0430

    Well didn’t don’t any leaks in the intake system. Hooked up a smoke machine and the only place any smoke ever trickled out was the air filter. Nothing from the intake or the piping. Drove around and fuel trims were between -18 and -21. I reset the trims and it goes right back. Not seeing...
  2. C

    Persistent P0420 and P0430

    Just checked the one and stopped. Wasn’t what I expected to find and got a little ticked off. Haven’t messed with the intake. Gonna check that tomorrow with some starting fluid. But wouldn’t a vacuum leak give me positive fuel trims? Went with the Walker cats/h pipe assembly. No leaks that...
  3. C

    Persistent P0420 and P0430

    Well this isn’t good. Powdery white ground strap. I know these are supposed to be frugal with fuel but not this much. But explains a lot. Gonna go in and reset the fuel trims and alcohol percentage to see if it relearns.
  4. C

    Persistent P0420 and P0430

    Gauge plugged onto the fuel rail. I’m gonna pull a plug or two out today and see what they look like as well.
  5. C

    Persistent P0420 and P0430

    Also, new MAF since I cleaned the old one with brake clean. Don’t do that. It turns the potting on the circuitry to sticky goo.
  6. C

    Persistent P0420 and P0430

    Ok so I got back out and checked it. Key on engine off 55 psi. At idle jumped to between 60 and 62. Long term fuel trims were -8 and -10. At 2000 RPM pressure was still 60 - 62 but fuel trims were -18 and -20. I didn't check O2 readings. I’ve read that spec is anywhere from 43 to 62. Anybody...
  7. C

    Persistent P0420 and P0430

    New K&N panel with the excess oil wiped off. Goes into closed loop just fine. I’ll check fuel and such at 2000 later and post. Thanks.
  8. C

    Persistent P0420 and P0430

    Hello All, I’ve been searching forever it feels with no luck. I bought a used 07 Tahoe with a flex fuel 5.3. 165k miles. Decent shape but as I look into it more, maintenance was sub par. It had P0430 and a bunch of EVAP codes when I got it. Replaced the cats since it was rattling. 4 new GM O2...
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