Question about 1999 Chevrolet Silverado 1500

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Lifter noise My truck recently started making a knocking noise ay start up and will continue until it gets to normal temp.It is a 4.8L.I used an engine flush the first time and it cured it for about 2 months now it is back. ANY IDEAS?

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  • Anonymous May 04, 2009

    I have a 1999 and it started about a month ago. I added lucas oil treatment and it was quiet for about two weeks than it really started tapping. Now when I start the truck it taps for about a half hour or so. My mechanic said I have a collapsed lifter. Any ideas

  • Anonymous Mar 22, 2014

    Knocking noise from engine when I start it

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This is a very common issue with General Motors. I have never bothered to try and fix it because it is not causing any harm. It is because General Motors still uses a push rod motor and the cold oil causes it to knock a little until the oil gets warmed up.

Posted on Aug 05, 2008

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Mine started at 120,000 miles so i replaced oil pump with a high volume and problem solved also used 5w 50 synthic oil. truck just tured over 300,000 last week

Posted on Mar 19, 2009

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I believe what you are running into is the piston slap issue GM has with the newer generation motors (mid 99 up). They shortened the skirts on the pistons to make them lighter as well as coated the outside of the piston with some type of coating (not sure exactly what it is). They run quite for about the first 20 to 30 thousand miles and then it starts to become noticeable on cold start ups and usually goes away after a short period of time. My truck started at 32,000 and it now has 231,000 miles on it and does not use a drop of oil, but it knocks in the morning and knocks on hot days at idle. I have heard some engines sound like a 90's model ford power stroke when they crank in the morning and they run fine as well, just have to put up with the noise. Two things that did make mine better where Synthetic Oil (10w-30) and/or Lucas oil Treatment. You can give a shot and it may or may not help yours out?

Posted on Sep 25, 2008

You have to use the 5W30 oil only, if you change weights it will make noise on start up

Posted on Jul 29, 2008

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