A clogged CAT is the convertor. Convertor is first in exhaust stream after O2 sensor and is bolted in place, you can remove bolts and visually check the CAT, look for melted material, or cracks. If you do this, you will most likely need new bolts and gaskets.
If CAT is bad, you need to find cause, which is usually a rich mixture caused by failed sensor. If your check engine light is on, short TE1 and E1 terminals of the diagnostic terminal, turn engine to "on" (do not start) and check engine light will flash codes, for example, flash. Pause. Flash, flash is code 12, each code will flash three times.
As I mentioned, you need a special tool set to check fuel pressure, you remove cold start valve fuel supply from rail, screw in special fitting, then use mechanical gauge to check fuel pressure.
Monday, April 20th, 2009 AT 7:48 AM