2003 Chevy Cavalier low power

140,000 MILES • 4 CYL • FWD • AUTOMATIC
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JIMMY SNOW
  • MEMBER
  • 1 POST
My car has been running fine, just put a new fuel pump on and filter, we drove the car one night ,ran fine, next day would barely start , ran rough and had no power, diagnostic says sys. too rich bank one,catalist efficient below thresh hold bank one evap emission leak, i heard that the 02 sensor might be bad but someone told me it wouldnt make it run bad
Feb 7, 2009 at 9:11 PM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
Sounds more like the convertor is clogged. Depending on the severity of the clog, it would run rough or not at all.

Have a backpresure test performed on the CAT, or if it is bolted on, unbolt and look at it. If material is melted/cracked then the convertor would need to be replaced.
Feb 8, 2009 at 1:20 AM
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