Knocking sound

2000 CHEVROLET SILVERADO
61,000 MILES • V8 • 2WD • AUTOMATIC
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JIMPSE
  • MEMBER
  • 2 POSTS
Have a 2000 chevy silverado with a 5.3 motor. When I start it when its cold it makes a slight knocking sound when I put it in drive for about five seconds and then it goes away. Only does it when its cold. Never when it s warm. and it doesnt do it when it is in park. Any ideas?
Dec 26, 2010 at 10:32 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
If the noise is coming from the upper end of the engine -could be a lifter leakdown problem-try engine flush and see what happens
Dec 26, 2010 at 11:19 AM
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JIMPSE
  • MEMBER
  • 2 POSTS
I am a little leary about an engine flush. Ive read a lot of horror stories about them. Any other ideas besides replacing the lifters?
Dec 27, 2010 at 5:37 AM
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