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  1. recycleoldgrowth

    2004 8.1L Ticking/Rattling @ 1800 RPM

    So yes it should show a positive number with unmetered air getting in before the O2 sensor? Sent from my SM-G530T using Tapatalk
  2. recycleoldgrowth

    2004 8.1L Ticking/Rattling @ 1800 RPM

    Would this also cause the negative Fuel Trim numbers I'm seeing? Wouldn't it be a positive number because the computer thinking it's got a lean condition? Thanks for your feedback. Sent from my SM-G530T using Tapatalk
  3. recycleoldgrowth

    2004 8.1L Ticking/Rattling @ 1800 RPM

    So my 8.1 has 130K, no mods. I'm the third owner, was sold to me out of Canada. Some good amount of rust on the undercarriage but nothing to alarming. Recently I hear a loud Ticking/Rattle right at 1800RPM that will continue if I hold it there. I'm assuming it's on of two things, lose heat...
  4. recycleoldgrowth

    Slight idle bounce 2004 8.1L

    Bought it used, but I'm sure it's all stock, definitely no tune. Correct me if I'm wrong but wouldn't a vacuum leak effect + FT, not - FT? A leak would increase the air mixture so the PCM would add(+FT) (enrich) because of a perceived lack of fuel for that condition. Am I wrong here? Thanks...
  5. recycleoldgrowth

    Slight idle bounce 2004 8.1L

    I just had time to review 3 sets of live data across multiple RPM ranges I'm seeing a common thread. The LTFT on both banks seems to me to be very lean at idle -9% to -14% (not getting enough air?) At higher RPM'S it reading +5% to +9% (getting to much fuel?) I was under the impression that...
  6. recycleoldgrowth

    Best tuner for 2004 chevy 8.1L?

    Wondering what you all think would be a good tune for my gas hog. Not looking to brake the bank here. Tell me what you know about what the gains may be, thanks in advance. Sent from my SM-G530T using Tapatalk
  7. recycleoldgrowth

    Important!: Can't locate ANY vacuum lines? !

    I can not for the life of me find one single vacuum line on my 2004 chevy 2500 8.1L, also has no EGR valve. I have an Idle bounce and am trying to figure out what the problem is. Took the fuel pressure at the rail. At KOEO was 55psi, KO pressure holds. At idle it reads able 63psi and will rise...
  8. recycleoldgrowth

    Slight idle bounce 2004 8.1L

    Tell me more? Sent from my SM-G530T using Tapatalk
  9. recycleoldgrowth

    Slight idle bounce 2004 8.1L

    If I remember correctly it's like 55 psi with KOEO, a little less with the engine running? Sent from my SM-G530T using Tapatalk
  10. recycleoldgrowth

    Slight idle bounce 2004 8.1L

    What numbers should I be looking out for? Sent from my SM-G530T using Tapatalk
  11. recycleoldgrowth

    Slight idle bounce 2004 8.1L

    That I can do. Sent from my SM-G530T using Tapatalk
  12. recycleoldgrowth

    Slight idle bounce 2004 8.1L

    Does that data show on the scan tool or would I need to connect to the fuel rail? So I guess my answer would be I'm not sure. Could it only affect it at idle? Thanks for the quick response. Sent from my SM-G530T using Tapatalk
  13. recycleoldgrowth

    Slight idle bounce 2004 8.1L

    Just recently replaced my alternator thinking because it's diodes were going bad was why my idle was rough. Turns out that was not the case. The voltage swing is gone (except now when the idle drops, so does the voltage) but the idle bounce is still there. (We're talking from 600, to 500 then...