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Another cat question
Posted by Harold [Email] (more from Harold) on Sat, 23 Aug 2008 10:01:38
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I’m ready to do my 210k service on my 91 NA. About 2 years ago (just prior to the 2006 test) did some significant work to replace a burned exhaust valve. I had my injectors cleaned at that time. Still have the original O2 sensor (supposed to be life time on 91). Ignition system seems to be in good shape, timing is EZK so not adjustable and is within spec at idle, good compression, no oil usage, no vacuum leaks, car runs better than ever, getting 28 – 30 mpg commuting. Looking at my emission data, I have been pretty lucky over the last two tests (CO max is 118 and NO max is 799 at 15 mph). I would really like to avoid a failure and have to deal with the State. So I as planning to replace the cat this fall. Would that minimize my risks or, based on the data below, am I wasting money?
15 mph
CO2 O2 HC CO NO
12/21/98 15.4 0.3 112 0.31 883
12/14/00 15.0 0.1 46 0.07 241
11/14/02 14.0 1.1 114 0.59 903
12/07/04 14.6 0.98 117 0.29 755
11/22/06 14.0 0.5 72 0.41 799
25 mph
CO2 O2 HC CO NO
12/21/98 15.3 0.1 69 0.28 315
12/14/00 15.0 0.1 34 0.05 242
11/14/02 14.5 0.7 17 0.14 222
12/07/04 14.6 0.92 32 0.17 473
11/22/06 14.3 0.2 23 0.17 435
posted by 68.121.17...
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