passed emmisions today

The O.G.

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May 28, 2007

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witch city,mass

Jul 25, 2007

#1

• Jul 25, 2007

• #1

i was a little nervous but it passed,but anyone notice anything wrong?


reading limit
hc gpm 01.05 0.120
co gpm 000.00 020.00
nox gpm 01.25 02.50
co2gpm 404.00 n/a

 

HISSIN50

"How long does it take to get help in here?

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Jul 25, 2007

#2

• Jul 25, 2007

• #2

The HC thing might have been an error with the readout/syntax.

 

The O.G.

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May 28, 2007

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witch city,mass

Jul 25, 2007

#3

• Jul 25, 2007

• #3

HISSIN50 said:

The HC thing might have been an error with the readout/syntax.

Click to expand...

sorry meant to type hc 01.05 01.20

 

The O.G.

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May 28, 2007

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witch city,mass

Jul 25, 2007

#4

• Jul 25, 2007

• #4

csgoody said:

i was a little nervous but it passed,but anyone notice anything wrong?


reading limit
hc gpm 01.05 0.120
co gpm 000.00 020.00 i was told this is awfully lean:
nox gpm 01.25 02.50
co2gpm 404.00 n/a

Click to expand...

the car is running like poop
will be checking timing, fuel pressure,vacuum leaks,or any other leaks,
just registered this week,looking foward on another money pit

will get some pics up soon for flaming

 

cjones

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Jul 20, 2002

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Avondale, AZ

Jul 25, 2007

#5

• Jul 25, 2007

• #5

csgoody said:

reading limit
hc gpm 01.05 0.120
co gpm 000.00 020.00 i was told this is awfully lean:
nox gpm 01.25 02.50
co2gpm 404.00 n/a

the car is running like poop
will be checking timing, fuel pressure,vacuum leaks,or any other leaks,
just registered this week,looking foward on another money pit

will get some pics up soon for flaming

Click to expand...

in regards to the CO. what was the O2 reading?? looks like you may have a misfire because elevated HC, low CO.

 

The O.G.

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May 28, 2007

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witch city,mass

Jul 25, 2007

#6

• Jul 25, 2007

• #6

my paper work does not say 02 readings that i can see...


i was told an avergage should be around 010.00 of co

also hc hydrocarbon?
co ?
nox?
co2 ?

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Jul 25, 2007

#7

• Jul 25, 2007

• #7

csgoody said:

my paper work does not say 02 readings that i can see...


i was told an avergage should be around 010.00 of co

also hc hydrocarbon?
co ?
nox?
co2 ?

Click to expand...

HC = you're right.
CO = carbon monoxide
Nox is oxides of nitrogen
CO2 is carbon dioxide.

 

T

tderrick

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Oct 27, 2004

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Jul 25, 2007

#8

• Jul 25, 2007

• #8

If you still have all four cats, your running rich
for some reason... imo

 

go-stang5.0

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Glenview,Il

Jul 26, 2007

#9

• Jul 26, 2007

• #9

yea I agree about the rich part....

I was only allowed .90 on the HC's for my last emissions test and I had to try 3 times but I got it to pass.... with HEET in the gas, leaning it out(dropping fuel press. to 35# WOT on 24# injectors ) and retarding timing 6 deg. form stock. THis is on the motor in my sig. with an non emissions legal cam...and hi-flow cats. I got the HC's down to .63 after experimenting . But yea if I can get my HC's down that low on a stock motor running 4 cats you gotta be rich. Have you done a tune up lately? Check your timing too...with your CO so low your timing may be too advanced.

 

The O.G.

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May 28, 2007

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witch city,mass

Jul 26, 2007

#10

• Jul 26, 2007

• #10

it does have originall cats

i do have a trick flow top end ,65mm tb,cai,75pro m,24#,shorty headers,superturbos...


i do have fuel press reg. 39psi is stock?

funny they didnt say anything about the hcs beeing rich..

just that the co number being low or not even showing any thing at all is running lean..



all mods done by previous owner so i will have figure every thing out

 

The O.G.

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May 28, 2007

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witch city,mass

Jul 26, 2007

#11

• Jul 26, 2007

• #11

yes all original cats
not a stock motor ....tf top end,65mm,cai,pro m 75mm,24#,shorty headers,

funny they did not mention anything about the hcs being high
just the co number showing nothing at all is lean...

i will check plugs ,,what color for rich ,lean gap at ?

timing set at ten to start?

fuel pressure 39psi ?

o2 sensor could be junk also?

 

C

chuck943

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Oct 26, 2002

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north carolina

Jul 26, 2007

#12

• Jul 26, 2007

• #12

HC will go high if lean or rich,CO is the key here. CO is an unstable gas and has only one particle of oxygen and it wants to become CO2( thats why the stuff will kill u, it will absorb the oxygen out of your body). With no CO present means u have to much oxygen present-lean(but only border line cause HC is still in limits)

 

The O.G.

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May 28, 2007

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witch city,mass

Jul 26, 2007

#13

• Jul 26, 2007

• #13

not enough fuel then to go along with all that oxygen?


thanks for all replies

 

go-stang5.0

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Glenview,Il

Jul 27, 2007

#14

• Jul 27, 2007

• #14

yea what chuck says makes a good bit of sense...

 

1TallMF

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Apr 17, 2006

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Montreal

Jul 27, 2007

#15

• Jul 27, 2007

• #15

I agree.

I had a hard time getting mine to pass the NOx levels. I started-out at 10* base timing, the NOx levels were almost double the limit, while HC were right around zero. Brought the timing down to 6*, made a huge difference but still NOx was too high. Brought it down some more (2* base) and the car finall passed AT the NOx limit. I think it was running lean or something, but CO levels were at a nominal level. I bumped the timing back up to 12* base before ever leaving the shop afterwards.

 

C

chuck943

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Oct 26, 2002

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north carolina

Jul 27, 2007

#16

• Jul 27, 2007

• #16

1TallMF said:

I agree.

I had a hard time getting mine to pass the NOx levels. I started-out at 10* base timing, the NOx levels were almost double the limit, while HC were right around zero. Brought the timing down to 6*, made a huge difference but still NOx was too high. Brought it down some more (2* base) and the car finall passed AT the NOx limit. I think it was running lean or something, but CO levels were at a nominal level. I bumped the timing back up to 12* base before ever leaving the shop afterwards.

Click to expand...

NOx or better known as smog forms when combustion chamber temps reach around 1200 or so degrees F. The EGR is what is used in most vehicles to control this. The exhaust gasses put back into the combustion chamber by the EGR displaces some of the air fuel mixture thus making it not as hot lowering the temps. Anything like lowering timing to decrease the amount of burn time will lower these temps though.

 

cjones

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Avondale, AZ

Jul 27, 2007

#17

• Jul 27, 2007

• #17

NOx forms at 2500* F

in my earlier post i stated a probable misfire. remember a A/F too lean will cause a misfire. to bad the report doesn't show O2 levels because that is used for diagnosis.

 

C

chuck943

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Oct 26, 2002

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north carolina

Jul 27, 2007

#18

• Jul 27, 2007

• #18

cjones said:

NOx forms at 2500* F

in my earlier post i stated a probable misfire. remember a A/F too lean will cause a misfire. to bad the report doesn't show O2 levels because that is used for diagnosis.

Click to expand...

Yeah I couldn't remember exactly (got that CRS disease) for some reason 1200 to 1400 was sticking in my head but that is C not F.
I stand corrected LOL.

 

The O.G.

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witch city,mass

Jul 27, 2007

#19

• Jul 27, 2007

• #19

i guess emmisions can be a good thing too

 

HISSIN50

"How long does it take to get help in here?

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Jul 27, 2007

#20

• Jul 27, 2007

• #20

csgoody said:

i guess emmisions can be a good thing too

Click to expand...

CH4 emissions help after eating a big bean burrrrrritooooo.