2003 Hummer H2 Engine Knocking Noise

2003 HUMMER H2
108,000 MILES • V8 • 4WD • AUTOMATIC
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HUMMER H2
  • MEMBER
  • 1 POST
Hi I hear a knocking noice or maybe its a ticking noise im not exactly sure but it happens when after I start the engine and when the engine idles and the noise happens and it has oil and it come and goes when the engine heats up. What could it be and how to fix it?
Sep 13, 2009 at 6:15 AM
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FACTORYJACK
  • ✓Experienced Mechanic
  • 4,159 POSTS
At first guess, it could have an exhaust leak at either the left or right side rear port. By rear I refer to #7 or #8 cylinder. Often times a bolt breaks and has to be extracted. It could have a catalytic converter coming apart causing a rattle, also. Just a couple guesses.
Sep 14, 2009 at 3:27 PM
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