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  1. J

    02 5.3- intermittent sudden jolts and loss of power at high speeds

    Ok, so I've looked into the MAF, but I have never replaced it (i've had the truck for 4 years). @Fless Not sure what the condition is like. @SnowDrifter I've had the fuel pump go out on this vehicle before, and it was a very different loss of power, so I'm pretty confident that that's not it...
  2. J

    02 5.3- intermittent sudden jolts and loss of power at high speeds

    So, I recently fixed a handful of things on my truck to fix a misfire problem I was having, and it worked but all of the sudden I have this new concerning problem. Very intermittently (twice in about 2k miles), when driving at fast highway speeds, I will feel a loud jolt in my car and the whole...
  3. J

    Replaced belt tensioner on 2002 5.3, squeal got worse SOLVED

    Ok, so yesterday I took my belt off to check for loose pulleys again, and to try and run it briefly to see if the squeal was still there without the belt. The squeal was gone and I felt a wee bit of play in the power steering pump pulley. So, I out the belt back on and figured I would replace...
  4. J

    Replaced belt tensioner on 2002 5.3, squeal got worse SOLVED

    I hand't thought of this.. you could be right, do you know any tricks for checking to see where the squeal is coming from?
  5. J

    Replaced belt tensioner on 2002 5.3, squeal got worse SOLVED

    I will look into the diagnostic kit, thank you!!
  6. J

    Replaced belt tensioner on 2002 5.3, squeal got worse SOLVED

    Ok, so quick update on this. When I first replaced idler pulley and belt in May, the squeal did go away. But, only a few days later, it started coming back.. but more intermittently. I got some other work done to fix my high idle (evap canister and O2 sensor actually helped a ton!) and then I...
  7. J

    Replaced belt tensioner on 2002 5.3, squeal got worse SOLVED

    Ok, so I've replaced the idler pulley and the belt and the squeal is gone! The idler pulley still runs a little on edge, and I think I'll add an additional spacer when I get a chance. Thanks so much for all your help guys!
  8. J

    Replaced belt tensioner on 2002 5.3, squeal got worse SOLVED

    So, the idler pulley I took off had a spacer just like the AC Delco, but it still rides on edge.
  9. J

    Replaced belt tensioner on 2002 5.3, squeal got worse SOLVED

    Ok, so last night I was able to replace the belt and the idler pulley. The squeaking is gone! The idler pulley still rides a little off center, but it’s a smooth pulley with no grooves. It’s going good for now so I’m gonna keep checking on it and maybe add another spacer to line it up better
  10. J

    Replaced belt tensioner on 2002 5.3, squeal got worse SOLVED

    Interesting! So, my belt isn’t off on any of the grooved pulleys, but it is off on the smooth idler pulley (which is so odd)- I wonder if it’s just slipping there?
  11. J

    Replaced belt tensioner on 2002 5.3, squeal got worse SOLVED

    Ok, so as far as I know I have a 130A alternator. I’m not sure what belt I have, but I’m going to get a new one and I will make sure it’s the right length for the 130a. I am pretty sure that my belt is the right size because it worked fine for the last several years until I started replacing...
  12. J

    Replaced belt tensioner on 2002 5.3, squeal got worse SOLVED

    Ok, so I just checked out some of the other pulleys a little better and checked out everything you guys suggested. I don't have an AC belt. 1) The alignment on my tensioner is pictured- it is definitely off compared to you guys'. However, I can't adjust it any more without it loosening- could...
  13. J

    Replaced belt tensioner on 2002 5.3, squeal got worse SOLVED

    Hello. So, I have a 2002 Tahoe with a 5.3L V8 (241K miles) and I've been having some rough idle issues/ intermittent belt squeals for the last 50,000 miles or so. I've done a handful of things to calm the idle down, and I just replaced the belt tensioner pulley yesterday (the bearing was bad) in...

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