Re: Exhaust/ EGR problem?
i had the same problem. Sounds like you have a bad oxygen (02) sensor. Since your check engine light is coming on, i suggest you immediately go do one of two things:
1) go buy a ford code reader, which will diagnose the problem for you. You hook it up to the engine's computer and it retrives a code which you look up the definition for in the provided manual. ($45)
2) have the codes read at a mechanic or your local ford dealership.
in case you are unfamiliar as to what the 02 sensor does here it is in a nutshell:
the 02 sensor simply senses oxygen. it is a part of the speed density setup in your vehicle. it helps adjust the air/fuel mixture as close to the proper ratio as possible. if it senses too much oxygen, the computer senses that the a/f mixture is lean. if it senses too litle, it lets the computer know the a/f is rich. then the computer adjusts the mixture accordingly.
If it is your 02 sensor, and the problem has been around for awhile now GO CHANGE IT IMMEDIATELY because running a too lean or too rich a/f mixture in your engine is NO GOOD for the engine. ...especially a lean mixture.
keep me posted