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350 Vortec and Piston Noise?

Discussion in 'Chevy/GMC 4x4' started by buckshot122486, Feb 6, 2008.


  1. buckshot122486

    buckshot122486
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    I've got a 1999 K1500, 5.7L 350 Vortec and it is driving me nuts right now.



    I have a ticking noise that is really rough when you first crank it up but it isn't there all the time. The noise also usually goes away after driving a mile or so or just allowing the engine to ideal for a few. It is bad sometimes and then sometimes it is very faint. Sometimes the sound will come from the passenger side and sometime it will come from the driver's side. I first thought is was the lifters but according to the guy that does all of our engine work, it isn't. He said that he thought it was something to do with the piston heads and the way the are built, I think (my dad relayed this to me so if something sounds a little of help me out). Supposedly this seems to be a common problem because there are a few trucks that I've heard of this happening to. Well according to him (BTW-this guy has never screwed us so I'd like to think he is telling the truth) the only way to fix this is to either rebuild the motor or put a new one in.



    SO, this is my situation. I will not even be able to think about doing either of these options until later on this summer. I was told that most people just live with it but I'd like to know is there anything that I can do to help the situation? Types of oil? Additives? anything......



    Also, the truck is burning oil, about 1.5 quarts in 3K miles, would this be the reason for it burning oil?



    Any help would be great. I don't know much about engines so this is a fairly new ball game for me. Thanks!
     

  2. Hometheaterman

    Hometheaterman
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    You sure it isn't piston slap that the Chevy's are famous for? Did that truck have them or was it just the later models? I know the later ones had a piston slap noise that was normal and nothing you could really do about it.



    Although since you are burning oil sounds like the rings might be shot.



    How many miles are on it?
     

  3. buckshot122486

    buckshot122486
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    140,000 miles



    It got this noise about 4 months ago and I was able to just change the oil and it went away but it came back about three weeks ago with avengence (sp?). It could be the piston slap, I've heard that mentioned but I've never heard it myself so... I was wandering about the rings also but I'm not really sure. I'd think the guy would have look into that for me but I'll inquire about that tomorrow just to make sure.
     
  4. rdnksierra

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    Mine does it too. Just on the first start when it is cold outside. I didn't hear it all summer long, then it is back again for another winter, the colder it is the worse the knock.



    Lighter oil helps the noise, but I'm like you I'm losing oil... I have 188k on my '97. I'm leaking/seeping some from somewhere, it is ending up on the oil pan and the starter, but I have to be burning some because I notice when I hit the hills for awhile (and lock in 3rd and turn some revs) I use it a little faster. I'm at a quart every 1500-2000mi. Oil loss is just a part of life in my opinion.



    As for the noise, I thought it was a lifter, maybe a piston, but mine always sounds from the driver's side. I just live with it, let the truck idle for a bit before I drive off (plugging in the block heater makes the noise non-existant).
     
  5. Olbluesilverado

    Olbluesilverado
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    Are you sure it's not just a lifter ticking?
     
  6. buckshot122486

    buckshot122486
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    Like I said, I thought it was but according my engine guy, he says it isn't. I don't know, I'm not very good with engines. I can do suspension, body and general stuff but I've never been able to understand and learn all of the engine stuff.



    I've got this up on another forum and some people are recommending Sea Foam......anyone know anything about or ever used this stuff?
     
  7. Bribyk

    Bribyk
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    Sounds like piston slap to me. It's not catastrophic, just a little embarrassing. It happens when the engine's cold because the block and pistons heat up and expand at different rates, so the manufacturer has to leave a little more clearance between the two when it's cold. My buddy's Landcruiser has the same thing..
     
  8. brockbeag

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    You have a hydraulic lifter bleeding down, after it runs a few minutes it pumps up. Pull your valve covers and you intake off and clean all of the built up sludge out really well. Next fill up with some cheap store brand oil and a cheap filter and drive until the motor is warm and then go home and change your oil. Another pointer when changing oil let it all drain out to a drip and pour a quart of cheap store brand oil in and let it drain on through, this will help flush all of the used oil out (I do this every oil change on everything I own)



    Remember when an engine begins using oil and you are running a lightweight oil like 5w30,10w30 or even 10w40, you can lessen your oil usage by upping to 20w50, straight 30, or even straight 50 for really worn out motors. 1.5 quarts between oil changes is not bad at all and at 140,000 miles you have well enough wear to swap to 20w50 oil if you choose, will not hurt a thing.
     

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