Emissions Test

7000rpmisheaven · 03-15-2002, 10:11 AM

Here are the standards i have to meet-
HC 1.8
CO 30
NOx 2.8

Can any one tell me how difficult it will be for me to meet these. I took the egr plate off and the smog pump too. I am running an O/R H-pipe now but I've got a brand new H-pipe that has 4 cats on it. I will definatley be installing it for testing. Also the car is in a good state of tune. New wires, plugs, filters, ect. My question is whether i will meet these standards without the other smog equipment or will i need to put them back on for the test?

PKRWUD · 03-15-2002, 10:36 AM

Your numbers don't make sense. HC is measured in Parts Per Million (ppm), and the national standard for '79 and newer vehicles is 50 ppm max. CO is measured as a percentage, and for '79 and later vehicles, it can't exceed .5%. I can't help you with the NOx, but if you get your CO and HC within limits, you shouldn't have any trouble. Recheck the numbers you have to be under to pass, and post them.

Actually, with a hot engine and exhaust, and an H pipe with new pre-cats and cats, you might be okay. The cats would work much better with the smog pump installed, though. I'm going under the assumption that you don't have any equipment standards, and only have to pass a sniffer test.

Take care,
-Chris

7000rpmisheaven · 03-15-2002, 10:52 AM

Sorry for the confusion. I'm in Maryland. The chart I looked at said (gpm) And the numbers i gave were the ones written. If this still doesn't make sense i will look into it further. The rule is that it is supposed to pass viual inspection but the last time i went they didn't check. And the first retest is free anyways. So If I go and they tell me to put the egr plate it I'll put it in and go back.

PKRWUD · 03-15-2002, 11:34 AM

I'll tell you what you should do. Install the H pipe, and the smog pump if you can. The EGR would help you if you have to do a "cruise" test (usually 1800-2000 rpm), but if you don't want to install it, don't. Set the timing to 10 BTDC, and open the gap on the spark plugs to .055". Make sure you have a 192 degree t-stat installed. Go have it tested. Take the long way (drive for at least 30 minutes), and make sure you get the engine as hot as you can just prior to the test. If it fails the visual, have the tech write down exactly why it failed. If it fails the sniffer test, they will give you the paperwork with the results, as well as the maximum numbers for each category. It should be done on a 4 gas analyzer that will list the readings for HC, CO, CO2 and O2. You may not have any maximums or minimums for the CO2 and O2, but their numbers will help in determining what needs to be done to pass. Bring that paperwork home with you and post the numbers here, or email them to me at:

pkrwuds@pacbell.net

If you do the things I've suggested, you will probably pass anyway, but if you don't, make sure to get the paperwork that tells your results, and what they were supposed to be.

Take care,
-Chris

7000rpmisheaven · 03-15-2002, 12:06 PM

I will do the things you suggested. Thansk for the help.

Chevyguy · 03-15-2002, 03:45 PM

Have you run your car on the test yet??

In Mass we have a similar test Our limits are different though

HC 2.0 GPM ( grams per mile) I got 2.77
CO 30.0 GPM I got 25.64
NOX 3.0 GPM I got 2.76

We get a CO2 reading I got a graph with no average, peak reading of 6.339 GPM and approx 5 GPM avg.

My car is a stock 90 125K miles with all equip working, but original O2 sensors ( duh) and h pipe.

I just picked up a pair of long wire bosh sensors and new plugs to try again this weekend.

Based on my results, you need to have everything hooked up, and the computer running correctly to have a shot!

7000rpmisheaven · 03-15-2002, 03:50 PM

no computer here, I'm carbed.

PKRWUD · 03-15-2002, 04:46 PM

Grams Per Mile. Boy that screws up everything. When did that start? My advice is the same, and I still want the results if it fails.

Take care,
-Chris

Jeb_Bush_2000 · 03-15-2002, 06:16 PM

Welcome to The People's Socialist Republic of Massachusetts.

03-15-2002, 10:11 AM	#1
7000rpmisheaven Registered Member Join Date: Nov 2001 Location: germantown MD Posts: 283	Emissions Test Here are the standards i have to meet- HC 1.8 CO 30 NOx 2.8 Can any one tell me how difficult it will be for me to meet these. I took the egr plate off and the smog pump too. I am running an O/R H-pipe now but I've got a brand new H-pipe that has 4 cats on it. I will definatley be installing it for testing. Also the car is in a good state of tune. New wires, plugs, filters, ect. My question is whether i will meet these standards without the other smog equipment or will i need to put them back on for the test? __________________ 85 GT 4bbl roller cam 2 ch. Flowmasters, O/R H-pipe Performer intake and carb milodon water pump, FMS 9mm wires, aluminum driveshaft, king cobra clutch

03-15-2002, 10:36 AM	#2
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Your numbers don't make sense. HC is measured in Parts Per Million (ppm), and the national standard for '79 and newer vehicles is 50 ppm max. CO is measured as a percentage, and for '79 and later vehicles, it can't exceed .5%. I can't help you with the NOx, but if you get your CO and HC within limits, you shouldn't have any trouble. Recheck the numbers you have to be under to pass, and post them. Actually, with a hot engine and exhaust, and an H pipe with new pre-cats and cats, you might be okay. The cats would work much better with the smog pump installed, though. I'm going under the assumption that you don't have any equipment standards, and only have to pass a sniffer test. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

03-15-2002, 10:52 AM	#3
7000rpmisheaven Registered Member Join Date: Nov 2001 Location: germantown MD Posts: 283	Sorry for the confusion. I'm in Maryland. The chart I looked at said (gpm) And the numbers i gave were the ones written. If this still doesn't make sense i will look into it further. The rule is that it is supposed to pass viual inspection but the last time i went they didn't check. And the first retest is free anyways. So If I go and they tell me to put the egr plate it I'll put it in and go back. __________________ 85 GT 4bbl roller cam 2 ch. Flowmasters, O/R H-pipe Performer intake and carb milodon water pump, FMS 9mm wires, aluminum driveshaft, king cobra clutch

03-15-2002, 11:34 AM	#4
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	I'll tell you what you should do. Install the H pipe, and the smog pump if you can. The EGR would help you if you have to do a "cruise" test (usually 1800-2000 rpm), but if you don't want to install it, don't. Set the timing to 10 BTDC, and open the gap on the spark plugs to .055". Make sure you have a 192 degree t-stat installed. Go have it tested. Take the long way (drive for at least 30 minutes), and make sure you get the engine as hot as you can just prior to the test. If it fails the visual, have the tech write down exactly why it failed. If it fails the sniffer test, they will give you the paperwork with the results, as well as the maximum numbers for each category. It should be done on a 4 gas analyzer that will list the readings for HC, CO, CO2 and O2. You may not have any maximums or minimums for the CO2 and O2, but their numbers will help in determining what needs to be done to pass. Bring that paperwork home with you and post the numbers here, or email them to me at: pkrwuds@pacbell.net If you do the things I've suggested, you will probably pass anyway, but if you don't, make sure to get the paperwork that tells your results, and what they were supposed to be. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

03-15-2002, 12:06 PM	#5
7000rpmisheaven Registered Member Join Date: Nov 2001 Location: germantown MD Posts: 283	I will do the things you suggested. Thansk for the help. __________________ 85 GT 4bbl roller cam 2 ch. Flowmasters, O/R H-pipe Performer intake and carb milodon water pump, FMS 9mm wires, aluminum driveshaft, king cobra clutch

03-15-2002, 03:45 PM	#6
Chevyguy Backyard Mechanic/Chemist Join Date: Feb 2001 Location: Acton MA USA Posts: 435	Have you run your car on the test yet?? In Mass we have a similar test Our limits are different though HC 2.0 GPM ( grams per mile) I got 2.77 CO 30.0 GPM I got 25.64 NOX 3.0 GPM I got 2.76 We get a CO2 reading I got a graph with no average, peak reading of 6.339 GPM and approx 5 GPM avg. My car is a stock 90 125K miles with all equip working, but original O2 sensors ( duh) and h pipe. I just picked up a pair of long wire bosh sensors and new plugs to try again this weekend. Based on my results, you need to have everything hooked up, and the computer running correctly to have a shot! __________________ 2001 Crown Vic Maurader Airbox/MAF, DR chip Edel IAS shocks Single exhaust :wtf: 93 P-71 Vic interceptor Backup car now 90 5.0 LX Notch SOLD 74 Chevy Laguna type S-3 454 under construction Currently apart undergoing bodywork.

03-15-2002, 03:50 PM	#7
7000rpmisheaven Registered Member Join Date: Nov 2001 Location: germantown MD Posts: 283	no computer here, I'm carbed. __________________ 85 GT 4bbl roller cam 2 ch. Flowmasters, O/R H-pipe Performer intake and carb milodon water pump, FMS 9mm wires, aluminum driveshaft, king cobra clutch

03-15-2002, 04:46 PM	#8
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Grams Per Mile. Boy that screws up everything. When did that start? My advice is the same, and I still want the results if it fails. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

03-15-2002, 06:16 PM	#9
Jeb_Bush_2000 Registered Member Join Date: Jul 2001 Location: Taxachusetts Posts: 374	Welcome to The People's Socialist Republic of Massachusetts.

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