1999 Ford F-150 Q&A
1999 Ford F-150 Question: What gasket would more likely need replacement if it is causing loudness?
more than likely it's an exhaust manifold gasket, the reason it gets quieter when warm is because heat expands the metal and closes the gap. Normaly they sound like a ticking. The exhaust manifold can be cracked also, or the bolts loose. good luck - illtrytohelp