when replacing intake gasket there is plastic ring?

1998 PONTIAC FIREBIRD
90,000 MILES
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RICKH69U
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on 3.8 fuel injectors there is a o-ring on the bottom where it fits into intake. There is also a thin ceramic or plastic ring what is its purpose. I replaced upper intake plenum gasket because of water leak. I was going to replace the bottom o-ring on the injectors and two of the small thin rings just fell into pieces..what do they actually do..thank u
Dec 6, 2011 at 3:47 AM
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SATURNTECH9
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The orings keep fuel and vacuum from leaking.
Dec 6, 2011 at 4:01 AM
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RICKH69U
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ok the bottom oring seals from vacuum leaks and fuel..the nylon ring isnt big enough to seal anything it fits tight to injector but not in the bore in intake
Dec 17, 2011 at 1:02 AM
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SATURNTECH9
  • ✓ASE Certified Mechanic
  • 30,869 POSTS
  • ASE Certified Mechanic
So did you get the injectors all fixed up?Looks Like that Nylon ring keeps the oring from moving out of place.
Dec 17, 2011 at 1:12 AM
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