loud engine knock could this be the egr valve or the pcv valve causing the knock?\

1996 ISUZU TROOPER
180,000 MILES
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RIBBO
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  • 1 POST
knocking all the time on start up
Apr 24, 2012 at 5:20 AM
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FIXITMR
  • ✓ASE Certified Mechanic
  • 9,990 POSTS
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you mean it runs rough or just makes knocking noise? i bad miss can make a knocking sound or some part internally has failed.hard to judge on net. does it knock worse when driven?
Apr 24, 2012 at 5:45 AM
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