Originally Posted by rrich
EGR - Exhaust Gas Recirculation. The 4.0 does not have an EGR Valve per se - the cam is ground such that it leaves a tad of exhaust gas in the cylinder, controlling NOx.
I'll bet she not telling, or didn't notice it backfired. The backfire blew the Evap vacuum hose off. Look closely under the master cylinder and at the intake manifold - look for a hose that fell off.
Simply put it back on. It'll run better and the CEL will eventually go out.
I got that it has not EGR, someone already posted it.
No CEL, went off on its own, and after 95 starts no CEL anymore. The EVAP codes are ghosts, confirmed by a stealership. The fiance knows what a backfire is, it never did unless there was a silent one...
According to the stealership, "the misfire was just a random fluke that can happen to any vehicle, and we probably will never know the real cause."
We've also got "low oil pressure in the cylinders. its suppose to have a minimum of 13psi, but we've only got 8psi."
I'll be starting a thread about that shortly...
Thanks for all the help guys!