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    ABS keeps buzzing but doesn't actually affect braking

    Nobody eh? I kinda figured... the abs on these trucks seems to be a real mystery sometimes.
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    ABS keeps buzzing but doesn't actually affect braking

    I should also add that it's a very fine vibration, not quite like ABS that's more of a random grinding, but much more like an electric buzz that's very uniform. I imagine it's the abs doing something that's similar to activating the abs but without actually engaging any of the brake lines.
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    ABS keeps buzzing but doesn't actually affect braking

    So my 2003 Yukon XL has a buzz/vibration in the brake pedal when I start up, but also sporadically afterwards. I believe the first instance is the ABS self-check, but after that it'll do it again at random, anywhere from 1 to 5x. It seems to stop after all systems are good and warm. When it's...
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    Engine knock from exhaust when cold

    Thanks Sparkvark (and gpd4) I'll have to take a look at them! Being a lifetime CO vehicle and having 140k, I doubt it, but it's certainly possible I guess, especially with the heat. I'll be back to you on that!
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    Engine knock from exhaust when cold

    So I put in the 0w=30 full synthetic and started it up this morning. The sound is a bit more subdued but it's certainly still there. I'm going to have to hope this is indeed an exhaust issue rather than an engine problem. We'll find out with time and I'll check back here for any other pointers...
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    Engine knock from exhaust when cold

    Boatguy: I actually just sold a trailblazer with 170+k on it that indeed sounded like a diesel for the first few minutes when cold. This doesn't sound the same, but it does give me a bit of reassurance nonetheless. Thanks
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    Engine knock from exhaust when cold

    Fless: That was my thought exactly, but at the DMV they told me it was to renew only, and that it likely wouldn't work with the temp tags they gave me. I'll have to read all the fine print or give them a call to double check this. We have a Rapid Screen van that's in Castle Rock quite often...
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    Engine knock from exhaust when cold

    Hmmm, I suppose it's possible it could be an exhaust issue; it did pass NV air inspection in Jan of this year, so I don't think it's a gutted cat. I took it in for air inspection here in CO but apparently the traction control won't turn off even though the dash says it's off when you toggle it...
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    Engine knock from exhaust when cold

    Here's a short clip of the sound. Again, you can strictly hear this at the exhaust, nowhere else. And it DOES speed up with the engine rpm's.
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    Engine knock from exhaust when cold

    I'll see if I can capture it on video. As far as piston slap is concerned, I was always under the impression that only lasted for a minute or less, not 10-15 like this sound. Is that not right?
  11. T

    Engine knock from exhaust when cold

    Thanks guys. First thing I'm going to try is a full synthetic 0w-30 just to see if the low cold temp viscosity makes a difference; I would suspect it will. I will update in a few days assuming my local Walmart carries it, otherwise I'll just try the 5w-30 synthetic. Cheers
  12. T

    Engine knock from exhaust when cold

    Hello all, and happy holidays! I could use some help here please; I recently purchased a 2003 Yukon XL with 140k on the clock, 5.3l engine. I was a little rushed after looking at many Tahoes/Yukons, especially since my wife was due with our 3rd child in less than 2 weeks. I made one sinful...

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