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Showing results for tags 'sounds'.
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2025 Suburban 5.3 V8 vehicle Notice how the sound is a rhythmic, metallic knock that seems to originate from the driver-side bank. It is most prominent when the vehicle is in Gear (Drive or Reverse) with the brake applied, especially after the engine is fully warmed up from a long shift. One tech says 'Lifter', another says 'Bottom End', and another says 'Torque Converter'. I would appreciate it if you could listen and let me know if this sounds like the typical L84 lifter failure or something else.- 1 reply
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- Knock knock
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Hello all, First let say thank you for anyone who can possibly help. I'm pretty frustrated as of right now, trying to run this down. 2014 Sierra 1500 5.3L All Terrain 125,000 miles Noticed a whistle/whine coming from the engine bay, but only when under load (won't do it in park), and accelating (stops as soon as I let off the throttle). I first noticed it when I was towing, but now does it everyday. It seemed to go away after the engine got warm. However, it seems to now be staying regardless of temp. So far I've: Changed all 3 belts, replaced the alternator, used a mechanics stethoscope with no luck. So my questions beyond what do you all think. 1. Could this be coming from the PCV tube being worn? 2. Where else should I look for a vaccume leak? 3. Literally anything else you may feel as pertinent, please let me know. Thanks Again, CG
