What would cause a engine knock?

1988 CHEVROLET CELEBRITY
140,000 MILES
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REDROSIE57
  • MEMBER
  • 2 POSTS
We had a strong gas smell. We changed the fuel pressure regulator and now its knocking.
Apr 22, 2012 at 4:28 AM
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KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
Where is the noise coming from?
Is engine running smoothly?
Apr 22, 2012 at 6:15 AM
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REDROSIE57
  • MEMBER
  • 2 POSTS
We had to put on a new fuel presssure regulator. After they got it back together, cranked it up and started knocking. Then there was smoke coming from the back where the regulator is. Our so-in-law said it might be a something like an exhaust leak there. It was midnight so he really couldn't tell.
Apr 22, 2012 at 11:44 AM
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