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I installed the new header pipe w new gaskets at both ends. I gently vacuum cleaned front open end of Cat. There were some crumbles of furnace cement pipepatch. Mesh grid of Cat was intact, unclogged, fairly clean. Reassembled all, reset OBD codes, ran engine for 30 mins. "Service" and "Check Engine" lights stay off. OBD reads 1-1-1.
I take car to same E inspection station for retest. Inspector tells me he told the other guy that car needs a Cat to pass and if it fails I have to pay $27 again.. I told him I replaced holey, leaking exh hdr w a new one - shouldn't be running lean any more - yes, retest.
New results:
HC 0.22 gpm passes; CO 0.64 gpm passes; NOx 4.52 gpm (down from 5.02) but still failing - NOx test limit is 2.00 gpm
Inspector says get a Cat. I drive 3 miles home, shut off engine, then run OBD test. Results: 2-3-1, 1-1-3, 2-3-1. "compensating for over rich or over lean fuel mixture at cruise speed". Thanks to advice rcvd here I'm disregardig the
1-1-3 code.
Counter man at Mt Kisco Truck & Auto Parts says he had similar problems, only too high NOx and only fixed when he finally sprang for and installed a new Cat.
I ordered CAT from FCP and a sew other things for $150+ to get free UPS shipping. Should have here Wed or Th. I ordered intake manifold gasket but they don't have nuts for the studs. Volvo parts? Get studs too? I want to be prepared.
Any opinions and advice for me to persue in the meantime? Thanks.
Steve
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