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  1. K

    Cursed Intake Manifold Bolts?

    Plastic Fel-Pros. Didn't know they made metal for this intake. I guess the jagged holes could be chewing it up. Idk how to verify the holes aren't the way they're supposed to be though. Any suggestions?
  2. K

    Cursed Intake Manifold Bolts?

    I can't imagine it being that far off, but I guess anything's possible. The wrench is lightly used, but coming up on 20 years old now. I have nothing intelligent to say, LOL. I had the same reaction when I discovered it. Because I'd only taken it off and installed it that one time, I didn't...
  3. K

    Cursed Intake Manifold Bolts?

    IDK? LOL Seriously though, I have a terrible memory and would never be able to remember the specific torque values for more than a couple days, but I know this, so I crack open the Haynes manual every time for the pattern and values. I know it's a two stage torque, center-out pattern, and I...
  4. K

    Cursed Intake Manifold Bolts?

    I got a heck of a WTF situation with my intake manifold bolts. Hoping you folks can help me figure it out and fix it. A couple years ago, I had an air leak on my '07 Tahoe 5.3, currently at 310k, and it was probably 250k or 260k at the time. I tracked down the leak with a smoke machine, and...
  5. K

    Need an Engine Wire Harness

    Thanks for all the help! And big thanks to @Fless! Got one from a salvage yard on the other side of town. They said it's had the two rear O2 connectors cut off, but that is one part of my existing harness I know is intact, so I'll take it. Other than that, they said the condition is "great"...
  6. K

    Need an Engine Wire Harness

    If I had another half a brain, I'd still only have half a brain, LOL. Thank you! I'll have to make some calls from those results in the morning. Side note, I'm getting a lot more search results for new harnesses searching specifically for LMG 5.3L harness instead of by Tahoe or with...
  7. K

    Need an Engine Wire Harness

    It just keeps kicking back a "non-interchange search result", which looks like an error, but I can't be sure because it's about as clear as mud. Doesn't seem to like 2007 or 2008 search criteria.
  8. K

    Need an Engine Wire Harness

    So far, on eBay, I am finding roughly the same playing field as what's available new... up to '06 only, or for the 6.2 only. There are small number of what look like the right ones, but none of them have a matching cross reference number, and all of them have various chunks of the harness, or...
  9. K

    Need an Engine Wire Harness

    The wiring harness for the engine on my 2007 Tahoe 5.3 is toast. I'm inclined to just replace the whole thing rather than **** around with repairing or rebuilding. Problem is I can't find one. GM part number is 25809100, but is discontinued and nowhere to be found. Are the any sources for...
  10. K

    2007 Tahoe/Rocker Racket - Not AFM! Need Suggestions...

    I am such a jerk! LOL When I hit "Watch" for this thread, I didn't click on the email notifications. I totally thought it was just a ghost thread that no one ever responded too! That and I had no clue I put it in the wrong sub-forum. First time I've made that stupid mistake. Sorry...
  11. K

    Running Rich After Injector Replacement - SOLVED

    Now there's something I hadn't thought of! I can absolutely see that, and I could see that thinning out the oil and contributing to my rocker noise I've been dealing with since I finished this. I see an oil change in my near future :)
  12. K

    Running Rich After Injector Replacement - SOLVED

    I just had another thought. You said you're reading about -9.5% trim now vs the -25% you were seeing. Is that only at idle conditions? I ask because that's about where my trim landed at idle at the end of this journey. At speed, the trims zeroed out, but the ~-9% at idle didn't seem bothersome...
  13. K

    Running Rich After Injector Replacement - SOLVED

    Oh these are gonna be dangerous words to say on the internet... I don't trust analog gauges for super precise readings. Just too much potential for human error, and I'm a pretty dumb human. Yours could have a really large scale and small range on it that you can have confidence in a 2 psi...
  14. K

    Running Rich After Injector Replacement - SOLVED

    @JamisMG, my fuel pressure ran a rock steady at 58 psi before, during, and after my nightmare. I think the biggest variation window i saw from dataset to dataset was 0.2 psi. It was little enough to call it zero. Where are you reading the 60? External gauge or with a tuner/diag tool from the...
  15. K

    2007 Tahoe/Rocker Racket - Not AFM! Need Suggestions...

    I swear this truck is determined to take a framing nailer to my coffin! 2007 Tahoe 5.3L FFV, 300k on the clock. TL;DR: I have what sounds like valve noise indicative of collapsed lifters, it's not related to the AFM (wrong cylinder(s)), and I'm trying to figure out the shortest path to fix it...
  16. K

    Running Rich After Injector Replacement - SOLVED

    Money and time slowed me down, but I finally wrapped this pig up. Just got home after the fix. It turns out the answer was all-of-the-above. The crappy Amazon injectors were definitely garbage, but in pulling the intake (which I did not do the first time), I discovered ALL of the manifold...
  17. K

    Running Rich After Injector Replacement - SOLVED

    Thanks for the replies! Some day I will remember to set the watch thread when I post, but it's anyone's guess WHEN I'll do that, LOL. I'll try to chip through the responses here... All 8 were missing intermittently/randomly, but #6 and #4 were pretty much dead stick - based on live-read data...
  18. K

    Running Rich After Injector Replacement - SOLVED

    My '07 Tahoe 5.3L FFV with 300k on the clock had a chronic misfire problem, which I narrowed down to the injectors (still the original injectors, which I was impressed by, LOL). Since I'm 6-months unemployed, I bought the new injectors on Amazon for $100 (for all 8). First drive after the...
  19. K

    Can The Water Pump Pulley Be Replaced?

    Yeah, that's the conclusion I came to. I actually thought about firing up the MIG, but the way the weld let go... that metal was toast long ago. If I did weld it, I'd probably spend an hour chasing the crack from the crystallization, and even if I got it to where I thought it would hold, and it...
  20. K

    Can The Water Pump Pulley Be Replaced?

    If it weren't for bad luck, I wouldn't have any luck at all. Replaced the water pump on my '07 Tahoe 5.3 in April. Got a cheap one on Amazon. Yesterday, on the home after being fired ("laid off"), my serpentine belt exploded. I popped the hood to find the weld on the water pump pulley...
  21. K

    AFM Disable Options

    As far as the dongle and future implications... yes. The way the dongle works is by basically sending a command over the CAN bus telling the AFM not to engage. Because the ECU is telling it to engage, then the dongle tells it not to, the ECU recognised it's command was not followed and...
  22. K

    AFM Disable Options

    Quality. The cheaper ones either may not have proper coding and may struggle for priority on the CAN bus, or they may be made with cheaper IC's and flash and will fail prematurely. That's strictly from my consumer products design experience, so consider that general advice, not specific to...
  23. K

    Oil Pressure Woes - Need Advice/Help

    Yeah. It was a "true" reading, which is to say it was that stupid filter mesh clogging up in the port under the sender I pulled the filter and just left it out, haven't had any issues since... except when it came time for smog and I realized without that filter that removing my AFM disabling...
  24. K

    AFM Disable Options

    Certainly. Basically you purchase the tuner, which was a shade over $400 for me, and then you basically have have a really fancy code reader, LOL To go from code reader to actual programmer, you have to purchase what HP Tuner call "credits", which for the Tahoe it requires 2 credits at $50...
  25. K

    EVAP I/M Readiness is Going to Be the Death of Me! - Somewhat Solved - Still Alive

    Ya know, sometimes I impress myself with how stupid I can be! :D It passed with the EVAP still at INC. All that and I could have been done with this 2 weeks ago, LOL. Thanks again for all the advice!

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