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Old 09-08-2015, 07:45 AM   #1 (permalink)
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Middle Tennessee Emissions Testing

Kudos to those of you who are regular posters around here, because of you I have never had to ask any specific questions. Simply searching the forum has given me more than enough information to complete whatever project I have been working on.

Presently I am considering engine options for my 1987 Chevy pickup and need to know what to expect when I roll through emissions testing in the middle Tennessee area, specifically Rutherford County. Like many I have never had to worry about testing until now. I called and the mechanic made it sound like they would be crawling under the truck counting 02 sensors and checking part numbers on EVAP canisters to make sure the engine had all of the proper smog equipment.

My question is what has everyone experienced? What documentation did you bring along if any? I am not trying to get out of installing the proper equipment, I am trying to make everything go as smooth as possible when I arrive.

Thanks,
Anthony
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Old 09-15-2015, 08:20 AM   #2 (permalink)
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Last weekend I ran into a guy who owns an older truck similar to mine that he uses as a daily driver and asked the questions I posted above. He told me that he was obviously no expert but that I should have no problems getting though as long as I could pass the emissions test. He said his truck was originally a TBI 350 but he was able to pass with a TPI 350 with a 4 barrel carburetor and intake swapped on. He said he has none of the emissions stuff that originally came on the truck. No egr, smog pump, etc. and had no problems getting past. He did say they had to lean out the carb a little bit to make it pass the test and he has the catalytic converter installed as well.

What I have read is the emissions guys do not do a visual inspection on anything other than to look for catalytic converter(s) and make sure the gas cap is good. I do not think the guys care if the vehicle originally came with one or two cats. They just look to see if there is a cat installed on all of the muffler pipes. It sounds more like a check the box type of thing. Yes they are there no they are not period. If it is an OBDII vehicle then they do the computer test. If it is not an OBDII vehicle they do the sniffer test.

I thought I would follow up just in case someone came looking in the future.
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Old 09-15-2015, 01:06 PM   #3 (permalink)
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Had no idea Tennessee was still a smog state. Or at least areas from what I gather. How far do they go back on cars that need smog'd checked?
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Old 09-15-2015, 01:33 PM   #4 (permalink)
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Only certain counties have emissions checks, basically the counties in and around Memphis, Nashville, and Chattanooga I believe. I live in Rutherford county. They check everything back to 1975.
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