# 2001 Silverado 5.3L with a tap, tap, tap or knock, knock, knock

**URL:** <https://community.cartalk.com/t/2001-silverado-5-3l-with-a-tap-tap-tap-or-knock-knock-knock/24802>\
**Category:** Maintenance/Repairs\
**Created:** [January 12, 2009, 7:18pm UTC](https://community.cartalk.com/t/2001-silverado-5-3l-with-a-tap-tap-tap-or-knock-knock-knock/24802 "2009-01-12T19:18:49Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ROBERTBOWIE1](https://avatars.discourse-cdn.com/v4/letter/r/ce7236/32.png) [@ROBERTBOWIE1](https://community.cartalk.com/u/ROBERTBOWIE1)\
**Post date:** [January 12, 2009, 7:18pm UTC](https://community.cartalk.com/t/2001-silverado-5-3l-with-a-tap-tap-tap-or-knock-knock-knock/24802/1 "2009-01-12T19:18:49Z")

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If started and imediatly put in drive, a knock, knock, knock for 45 seconds. If let warm up for 2 min the put in drive, all good. Oil change every 3000, no drip, no smoke, dipstick covers 5 out of 6 holes, clean oil, oil pressure 40 at stop, 60 when driving. 135,000 easy miles. What is the knock?  
  
 Thank ya,ll  
  
 Robert

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**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\
**Post date:** [January 12, 2009, 7:30pm UTC](https://community.cartalk.com/t/2001-silverado-5-3l-with-a-tap-tap-tap-or-knock-knock-knock/24802/2 "2009-01-12T19:30:40Z")

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See if you can reasearch if this is one of the GM engines that have been indetified as being prone to piston slap.

It is more likely related to a non-harmful valve train issue.

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<div class="post-metadata">

**Author:** ![ROBERTBOWIE1](https://avatars.discourse-cdn.com/v4/letter/r/ce7236/32.png) [@ROBERTBOWIE1](https://community.cartalk.com/u/ROBERTBOWIE1)\
**Post date:** [January 13, 2009, 12:05pm UTC](https://community.cartalk.com/t/2001-silverado-5-3l-with-a-tap-tap-tap-or-knock-knock-knock/24802/3 "2009-01-13T12:05:42Z")

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What might be a non-harmful valve train issue?  
Thanks

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**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\
**Post date:** [January 13, 2009, 2:25pm UTC](https://community.cartalk.com/t/2001-silverado-5-3l-with-a-tap-tap-tap-or-knock-knock-knock/24802/4 "2009-01-13T14:25:22Z")

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Simply noise cause by a hydraulic lifter not performing optimaly,yes you are dealing with a under performing valve train but it is not harmful ,just distressing.