Postby McMac » Mon Feb 29, 2016 2:43 pm
My service advisor (who was a wrench turner for a bunch of years before moving out front) at the dealership I use, heard a slight hissing coming from my engine bay when I was last in for an oil change. I couldn't hear it. Turns out 1 of the exhaust manifolds was cracked and therefore leaking. He said the catalytic converter on these V8's is bolted right to the block (something like that) and generate a bunch of heat. It was under emission warranty (8yr 80k) and they fixed it no charge to me. He said he's seen this a bit in the Titan's, but never in a V8 Pathfinder. He also said there is no way to test for it and it won't show up in diagnostics. They test by just sticking their head in both front wheel-wells with the engine running and listen.