I have a 99 Gran Am with 3.4 litre engine. The lower intake manifold gasket leaks anti-freeze. I've put 2 new gaskets in it, the last one 15,000 klms ago. Now it leaks again. Is this a common problem on this car and is there a better fix than what I'm doing?
Yes it is common, generally the best thing you can do is buy the most expensive gaskets you can find, use "right stuff" rtv gasket material wherever you can (do not use on seals that come into contact with fuel, and as with all rtvs apply a thin bead and do not spread or smooth with your finger or anything else, just apply and press the part on, if it smears when re-installing remove it, clean it thoroughly and start over). Also be sure to check the manifold for warping or cracking, and have a machine shop resurface all areas that are sealed with a gasket.
Fig. Lower intake manifold tightening sequence-4.3L engines 248 views
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