Question about 1998 Nissan Quest
These 3.0 engines had an issue with the manifolds warping and shearing off the manifold studs particularily on the corners. To repair correctly you would need to replace the warped manifold with new and drill ad possibly tap out broken studs and replace all studs with new. The only problem I am having with your question is that usually the exhaust smell lessens when the engine gets hotter as the expansion causes some sealing. But anyways thi is most likely your issue.
Posted on Sep 16, 2008
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