Have a troubling exhaust leak I can't seem to figure out...
Some history.. I have a 96 XJ that I replaced the typical cracked exhaust manifold on a while back.. at the time it seemed to still have a small leak that I couldn't find, well it doesn't get driven much so Ignored it.
Well fast forward to now; getting crap mpg, and the cat went. so after replacing the cat I decided to replace the manifold gasket again in hopes of finding/solving the leak. new felpro gasket, copper RTV, and cleaned and checked all surfaces excessively.
Also replaced the down-pipe donut, and checked for warping, new cracks etc.. no dice, still have leak somewhere.
Only seems noticeable when cold or when the engine is revved/under load..wtf am I missing? Should also mention there were no obvious signs of a leak on the old gasket either...the only thing i can figure is maybe the doorman manifold I put on there is leak prone...
TLDR version: replaced exhaust manifold gasket twice, still leaks.. wtf
Some history.. I have a 96 XJ that I replaced the typical cracked exhaust manifold on a while back.. at the time it seemed to still have a small leak that I couldn't find, well it doesn't get driven much so Ignored it.
Well fast forward to now; getting crap mpg, and the cat went. so after replacing the cat I decided to replace the manifold gasket again in hopes of finding/solving the leak. new felpro gasket, copper RTV, and cleaned and checked all surfaces excessively.
Also replaced the down-pipe donut, and checked for warping, new cracks etc.. no dice, still have leak somewhere.
Only seems noticeable when cold or when the engine is revved/under load..wtf am I missing? Should also mention there were no obvious signs of a leak on the old gasket either...the only thing i can figure is maybe the doorman manifold I put on there is leak prone...
TLDR version: replaced exhaust manifold gasket twice, still leaks.. wtf