Knocking Engine

GMC SIERRA
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BLKBLUR
  • MEMBER
  • 1 POST
I have a 96 GMC 3/4 ton P/U 5.7L-128000 miles. My engine knocks really loudly upon start-up but goes away after it's warmed up. I also have a front intake manifold leak(Could this be the cause for the knocking?) ...what needs to be removed to do an intake manifold job? Thanks!!
Nov 3, 2007 at 3:21 PM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
it very well could. to replace it you have to take off the throttle body, air intake hoses, IAT sensor and remove the bolts.
Nov 4, 2007 at 1:03 AM
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