Date registered: Dec 2005
Vehicle: W211 E320 Bluetec R129 SL500 - $1300 car ........ Ford F350 6l
Location: CA Bay Area
Mentioned: 9 Post(s)
Quoted: 1168 Post(s)
cats usually burn out, not wear out.
So yes, IMHO they could be the result, not the initial problem.
You should find "carburetor shop" who could run the engine test for optimal performance, or you can start DIY by putting new plugs, MAF and O2 sensors.
Doing those things you will get your money back on fuel savings, so no reason to hold on them if they are due.
Last edited by Kajtek1; 11-18-2011 at 11:59 AM.