Piston slap Q

Discussion in 'GM Powertrain' started by TJbear, Sep 19, 2009.

  1. TJbear

    TJbear Rockstar 100 Posts

    Hello everyone. I'm looking into buying an 04 Sierra SLT ext cab 4x4 w/5300. I'm aware of the piston slap issues many people have had with the 99+ engines. Was this still a problem by 2004?? And is it something that doesn't show up until later? The truck has 75K. Thanks!
     
  2. nos351wcm

    nos351wcm Rockstar

    I have the slap in my 00 silverado 4.8l. I researched this a while back and read that the piston slap doesnt hurt longevity or performance as long as you let the motor warm up in cold weather.

    I let the engine warm up before i drive it in the cold weather and it runs fine.
     
  3. Z71_guy

    Z71_guy Epic Member 5+ Years 1000 Posts

    got it with my 03 only on first start up in the morning most noticeable when its colder out
     
  4. CarpenterGuy

    CarpenterGuy Epic Member 5+ Years 500 Posts

    I had it on my old '06 with 97K miles. it stopped after 2 minutes of warm up.
     
  5. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    Dont have slap in my 05, 5.3 Z-71 but have always been in the south with it (alabama and florida) and have always used Mobil 1 oil. Dont know if that make a differance.
     
  6. TJbear

    TJbear Rockstar 100 Posts

    I ended up checking out a 2000 Sierra with the 5.3 and it did indeed make a little noise when I first started it cold. When I got back from the test drive and popped the hood with it running, it was purring like a kitten. Seemed like the tapping only lasted a minute or less after I started it.
     
  7. nlocho11

    nlocho11 Rockstar 100 Posts

    i've got it in in my 04 silverado, and like everyone else only when it was cold and after it warms up its fine. i started running synthetic high mileage oil in it as recommended by a friend and disappeared as soon as i did. 4000 miles later, no piston slap.
     
  8. Silverbullit

    Silverbullit New Member

    The noise is because of the type of pistons which have no skirt and are what they call hyperconnectic sp they use them is race engines and they are a low friction piston and they are small in diameter in design and need heat to make them fit the cylinder. Seeing as how every single 3.1,3.4,4.8,5.3,6.0 engine that uses them make the noise There can not be that many cylinders out of round. On race engines inwhich they were designed for noone hears the noise over the loud exhaust but they are a true and proven design and have had no durabilty issues that i have seen.
     
  9. truckingca

    truckingca New Member

  10. silverado00

    silverado00 New Member

    I have 205,000 miles on my 2000 5.3l and it has done it since day one, i always let it idle till it stops. nothing wrong with the slap, most peope just dont like buying 30k trucks and hearing the motor make noise. dont bother me,
     

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