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  1. K

    07 5.3 Knock Sensor Issue

    Like accelerating feels like a type 1 VW that needs a tune up pulling a fully loaded trailer up a hill. You push the pedal and there is literally no reaction for 3 or 4 seconds, then from there to speed i can just hear the poor girl chanting "i think i can, i think i can". Once it's up to...
  2. K

    07 5.3 Knock Sensor Issue

    So my 07 Tahoe, with it's new engine, came up with the left bank knock sensor low voltage code. I tried to look online, but everything i'm finding is for the previous gen 5.3 with the sensors under the intake. Mine are on either side of the block by the motor mounts. Since I can't find anything...
  3. K

    Strange Noise Under the Hood

    So ya'll are gonna laugh at me. I know I did. The sound is the pulsing of the evaporative emission valve once it opens. Somewhere between hooking up the fuel line and emission line and seating the powertrain on the mounts, that stupid line came disconnected. Now the fun begins because I can't...
  4. K

    Strange Noise Under the Hood

    No codes registered. Nothing i do seems to change the frequency of the sound, including climate blower speed or vent selection (foot/face/recirc/defrost/etc). Makes the noise whether heat or air is on or off. Ever heard a dialysis-style fluid pump running either dry or under heavy load? That's...
  5. K

    Strange Noise Under the Hood

    So I just finished a 4 day marathon to replace the engine, u-joints, and service the trans in my '07 tahoe. Everything worked perfectly, started on the first try, perfect temp out of the gate, perfect oil pressure, trans temp dead on, engine and trans smooth as silk, BUT... I have a noise I...
  6. K

    Loud Engine Noise... Maybe Serious Issue?

    Swathdiver, despite the AFM being the root cause of this evil, I decided to keep it. It lasted until 200,000 miles before the 1st cylinder saw the lifters collaps. If the truck hsd seen better maintinance from the previous owner(s) it probsbly would have gone even longer. On the new motor, sould...
  7. K

    Need wiring diagram or description for windows

    The drivers side front window stopped working abruptly yesterday on my 07 Tahoe. I need to test if it's the switch or motor, but I want to do it at the switch so i can avoid tearing open the door until it's actually time for the repair when i have parts and all that. To do that i either need a...
  8. K

    Loud Engine Noise... Maybe Serious Issue?

    So I know everyone is brimming with anticipation to know the final answer.... Ok back to reality now. So here's the deal, last week i was trucking home from work and as i accelerated to merge onto the freeway the truck fell flat on it's face. Went from american V8 to lawnmower power. MIL...
  9. K

    Loud Engine Noise... Maybe Serious Issue?

    There's an interesting thought. I'll check it just because it's a 194k miles if nothing else. I will add this, for what it's worth: consistency of the noise is either improving or I just didn't notice before, but it seems pretty reliable that the sound comes as RPMs drop. Both times in the...
  10. K

    Loud Engine Noise... Maybe Serious Issue?

    So after quite some time poking, proding, scoping, pulling valve covers, and replacing a headlight bulb in between I have determined.............. Absolutely nothing. Transmission mount is bad, but not the source (rigged the scope to the frame and drove it, no movement with the noise). Looked...
  11. K

    Loud Engine Noise... Maybe Serious Issue?

    So I finally bit the bullet and bought a scope. Didn't dig deep enough to start pulling plugs, but I got a purty good look at the converter and flywheel. I have no movement or visible damage on the flex plate or converter. For fun, I also got a good 360 look all around the trans, bell housing...
  12. K

    Loud Engine Noise... Maybe Serious Issue?

    Ok, I've bought into the idea that the converter bolts are a possibility. The knock sensor argument is compelling. Although I would think the ECU would register a disturbance that significant and regularly occuring. Regardless, it's easy enough to check, so it's on the list. Keep 'em comin'!
  13. K

    Loud Engine Noise... Maybe Serious Issue?

    Mucho good to know, because YES the 07 has v4 mode. Doesn't hardly work worth a poop (above 1500rpm it goes to v8 no matter what), but it's there. Guess it's worth pulling the valve cover while i'm in there with the scope. I hadn't thought of a valve spring. Never broke one on an sbc. I've...
  14. K

    Loud Engine Noise... Maybe Serious Issue?

    The flywheel bolts are an interesting thought. Although I feel like that would either be rythmic or more consistant (as in I could get it to perform on demand, which I can't). It's definately not a lifter type noise. I can rule that out right away. I know that noise. The only thing I could...
  15. K

    Loud Engine Noise... Maybe Serious Issue?

    I have no problem running a compression test. That's actually reasonable. What scares me is the end game. What is your thought in going that direction?
  16. K

    Loud Engine Noise... Maybe Serious Issue?

    None. I even hooked up the code reader to check for historical codes and the log is clear.
  17. K

    Loud Engine Noise... Maybe Serious Issue?

    I have an '07 Tahoe LT 2wd with the 5.3. Bought it 2 years ago with 130k, have 194k now. Earlier this year (march or april) my wife was driving it to work daily and started complaining of a banging noise when she accelerated. I drove it and it sounded like a rough AC compressor clutch, so i had...
  18. K

    Stabilitrac Gone Crazy!

    Hi all, new to the forum. Have a 2007 tahoe LT. Got some scary stuff I want some advice on. A couple weeks back the steering started getting stiff spots at slow speeds. I turned to the net because fluid and rack looked good with no pump noises. Found a bunch of horror stories about stabilitrac...
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