Question about 1995 Pontiac Bonneville

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Excessive Oil consumption, 1995 Bonneville Vin K 3.8

Replaced lower intake gaskets, while doing so I observed puddles of oil on top of lower intake manifold. While installing 2 bolts under plenum I added Permatex #2, new upper intake gaskets and new plenum. Vehicle Still uses a quart after 250 miles. PCV is suspect, since the engine is a 99 but I have re installed all the 95 components. PCV is in a compartment of the plastic plenum, but no external vacuum line is connected... wondering if there should be,, how does PCV vent without external Vacuum line?
thanks

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  • John Holt Sr Mar 12, 2009

    I will be looking at the tube inside under the plenum, I believe it is misdirected, or not connected to the pcv compartment..

    thanks emissionwiz!!

  • Anonymous May 07, 2009

    I have a 2000 bonneville 1qt 450 miles can anyone offer the answer

  • John Holt Sr Oct 01, 2009

    Sorry for such a long delay in responding, but for closures sake,, the 'O' ring on the PCV valve was petrified, so I changed the whole PCV and intalled a new 'O' ring and the problem of excessive oil consumption is solved. Its been a few months and the oil stays in the crankcase now.

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The PCV valve gets it's vacuum from the plenum itself. Some 3.8L have different types of connections on the top of the valve (electrical or mechanical), but none have a vacuum line on them.

If you replaced the lower intake gaskets, it is very likely they crushed around the intake bolts. This will cause oil to leak into the intake and pool in the recesses of the lower intake. You are also likely to be leaking anti-freeze.

This is a very common problem with OEM gaskets. After market gaskets made by Fel-Pro have metal rings in them specially to stop this problem. They are available at NAPA and other stores.

Posted on Jun 06, 2009

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  • Pontiac Master
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U need o repair the pcv vacuum source it is the cause of the oil consumption, which is excessive crankcase pressure.

Posted on Mar 12, 2009

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