Mechanics

WHEN REPLACING INTAKE GASKET THERE IS PLASTIC RING?

1998 Pontiac Firebird • 90,000 miles

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
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Rickh69u
December 6, 2011.




The orings keep fuel and vacuum from leaking.

Saturntech9
Dec 6, 2011.
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
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Tiny
Rickh69u
Dec 17, 2011.
So did you get the injectors all fixed up?Looks Like that Nylon ring keeps the oring from moving out of place.

Saturntech9
Dec 17, 2011.

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