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Will the PRE-cat cause my problem with High HC and NOX? I have changed the plugs and ordered the Sensors. Probably here Friday and will change Sunday. What does the EGR tube accomplish? It appears to be connected to the Pre-Cat. Will the Pre-cat cause other problems?

Since I don't have a Check Engine Light I am confused. Would all of the above, except for CAT, throw the CEL. Keep in mind the system functions correctly. I did find that the Spark Plugs, although functioning, were all carboned up. Primarily from city driving at slow speeds. I did change...

NO luck Not having any luck. Besides being hard of hearing, I must also be hard of seeing.

I went to the suggested site and appreciate the input and guidance. The site however has a lot of information but couldn't find a way to sign up and ask questions. I will try again later when I am not so frustrated. I am still left with the same problem and haven't got a significant answer...

Got this car for $500 and has 164K. It is a one owner car and I have all the manuals, past maintenance records and original window sticker. Car looks great and drives although Manual Shifter is loose as hell. Will be changing bushings next week I do have some issues with SMOG however. I...