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 Would you risk it? 
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Joined: Tue Aug 17, 2010 2:00 pm
Posts: 52
Location: Goodlettsville, TN
Part of TN: Middle
Post Would you risk it?
Since my truck passed the emissions test without a single emission device connected would you remove them from your truck or just leave it as is? I would really like to clean up the engine compartment and maybe bump up the performance a tad. The stock LT9/350M motor only has 160 HP and 260 lb ft of torque. With dual smog pumps and the AIR/EGR system the engine is really hard to get at. Looks like changing spark plugs and wires will be a major pain. Just wondering what you all would do.


Thu Sep 23, 2010 10:54 am
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Joined: Tue Jan 08, 2008 8:47 am
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Location: Sevierville, TN
Status: Drinking LS Kool Ade
Part of TN: East
Post Re: Would you risk it?
Is the inspection a county thing? How strict are they? How about registering it in a different county?

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Thu Sep 23, 2010 11:17 am
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Joined: Fri Oct 26, 2007 9:40 am
Posts: 6054
Location: Maynardville, TN
Status: Board Dad
Part of TN: East
Post Re: Would you risk it?
Sounds like all they are concerned with is what's coming out of the tail pipe. Take it off, put it in a box for the just in case down the road.

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Names David but you can call me Woody

74 K5 to be a 2WD, Just a driver
71 C-30 in pieces


Thu Sep 23, 2010 11:47 am
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Joined: Tue Aug 17, 2010 2:00 pm
Posts: 52
Location: Goodlettsville, TN
Part of TN: Middle
Post Re: Would you risk it?
Sumner County was a tailpipe only test. Funny thing - they claimed to see my catalytic converters when the truck never came with any. I would save everything of course and take lots of pictures. Just want to make it easier to work on and maybe find a couple of extra ponies.


Thu Sep 23, 2010 11:53 am
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Joined: Fri Oct 26, 2007 9:40 am
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Location: Maynardville, TN
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Part of TN: East
Post Re: Would you risk it?
If they do a idle only tail pipe sniff, you'll never have to worry about it.

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Names David but you can call me Woody

74 K5 to be a 2WD, Just a driver
71 C-30 in pieces


Thu Sep 23, 2010 12:12 pm
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Joined: Mon Jun 02, 2008 10:19 pm
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Location: Nashville, TN
Part of TN: Middle
Post Re: Would you risk it?
Pretty sure it's only a tailpipe test anywhere in middle TN that actually does testing. I never had any of that stuff on mine and never had a problem. Mine had no smog equipment, headers, duals, a weiand 4 barrel intake and performer 600 carb. Just make sure it's tuned up decent and you'll be fine.

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Thu Sep 23, 2010 9:18 pm
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Joined: Mon Feb 04, 2008 6:15 am
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Location: White House, TN
Status: Restoring a 68 SWB
Part of TN: Middle
Post Re: Would you risk it?
I live in Sumner too, but register all my vehicles in Robertson County for that exact reason. From what I understand, if your vehicle wasn't equipped with an obd? plug/dash warning lights then all they do is the tailpipe sniff. Where the problems come in is if you do have the plug and the lights. They pretty much won't pass your vehicle if any warning lights are on or if you computer is throwing a code, plus you still have to pass the tailpipe test.

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Thu Sep 23, 2010 10:01 pm
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Joined: Fri Oct 26, 2007 3:45 pm
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Location: White House, TN
Part of TN: Middle
Post Re: Would you risk it?
Dump it, Bob

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Fri Sep 24, 2010 7:54 am
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Joined: Tue Aug 17, 2010 2:00 pm
Posts: 52
Location: Goodlettsville, TN
Part of TN: Middle
Post Re: Would you risk it?
No ODB plug. Truck has the 350M motor and M vin code which means it is a 8600 GVWR HD Emissions vechicle so it runs on leaded fuel. No O2 sensor - no Cats. Just a bunch of pumps, pipes and hoses. Looks like I get to have a little fun taking stuff off. Thanks.


Fri Sep 24, 2010 9:34 am
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Joined: Tue Aug 17, 2010 2:00 pm
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Location: Goodlettsville, TN
Part of TN: Middle
Post Re: Would you risk it?
Should I leave the EGR valve connected? I have heard that you get better milage with it connected. But you know how that is. :cool:


Tue Nov 09, 2010 1:21 pm
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Joined: Fri Oct 26, 2007 9:40 am
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Location: Maynardville, TN
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Part of TN: East
Post Re: Would you risk it?
If you don't have any problem with pre-detonation, I would leave it un-hooked. Early EGR controls lacked a lot and can cause some hesitation off idle and lean run at lower speed.

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Names David but you can call me Woody

74 K5 to be a 2WD, Just a driver
71 C-30 in pieces


Tue Nov 09, 2010 3:03 pm
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Joined: Tue Aug 17, 2010 2:00 pm
Posts: 52
Location: Goodlettsville, TN
Part of TN: Middle
Post Re: Would you risk it?
Can I just block the hose on it now just to see what happens? Truck runs well with no hesitation. Seems flat on top though. Stock 85 350M/LT9 motor so my expectations are set pretty low anyway. Maybe I will throw in a EGR block off plate in my next Summit order and see if she likes it.


Fri Nov 12, 2010 10:19 am
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