exhaust manifold leak?
I just replaced the cat below the exhaust manifold. we couldnt pull it out from underneath the truck coz not only that screws (holding the exhst manifold and cat) are so tight but their positioning was so difficult reach using our available tools. So what we did was pull it out from under the hood, but in order to do that we also had to take out the exhst manifold. Everything went smoothly. We are able to install the new cat. We even put on a new exhst manifold gasket before putting it back. But when I started the engine, the noise came out as if theres a leak coming from the exhaust manilfold. I didnt notice any crack or something that may cause the leak. Should we have applied a gasket maker or some kind of sealant in addition to the new exhst manifold gasket? Any input will be appreciated. Thanks.
Nissan Frontier 01 SE 4 cyl, 2.4 lit 97.5K miles