Engine/Transmission (1994 - 1998) Exhaust fumes

[TitanIV]

I have a 1998 12V, auto trans. 4x4, Quad cab. The problem is when the truck is idling while stopped, I can smell exhaust fumes if the heat, defrost,vent, or A/C is on, however If max A/C is selected I cannot smell the fumes presumably because the fan is re-circulating interior air in that mode. Additionally, once the truck is moving the smell of exhaust fumes goes away. I have looked at the turbo joints, flanges, and exhaust manifold and haven’t found any signs of cracks or leakage. So I was hoping that perhaps somebody else may have run into this and figured out the problem. Thanks in advance for any assistance!

 

[hsmith]

Are you saying you have this problem with the windows closed? If so it has to be a small exhaust leak, probably at the manifold to head area. Look closely at the flanges, especially the lower areas that are not so easy to see.

 

[TitanIV]

Yes, the problem is with the windows closed. I will look more at the underside areas.