Question about 1998 Nissan Quest

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Engine problem fumes coming from exhaust manifold after engine warms up.

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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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What is it when gas fumes comes through the vents


You probably have an exhaust leak up by the exhaust manifold or catalytic converter that is releasing fumes to the engine compartment which makes it's way into your "fresh air" intake for your climate control.

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What type of fumes are they exhaust or oil burning.
Exhaust ..Idle engine and put glove on hand put hand over the tail pipe and if engine stops in 20 seconds then the exhaust is good if it keeps running then its the exhaust is your problem..
2 if ex ok then its due to the breather pipe on the engine and it should go back into the inlet manifold to be reburnt but if its not fitted or rubber hose split or broken then thats what you can smell.
So check out under the bonnet and see if you can smell or see any smokey fumes or sucking noise.
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1 Answer

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