passed emmisions today

[The O.G.]

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]

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

 

[The O.G.]

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

sorry meant to type hc 01.05 01.20

 

[The O.G.]

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

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]

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

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.]

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]

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 ?

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

 

[tderrick]

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

 

[go-stang5.0]

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.]

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.]

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?

 

[chuck943]

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.]

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


thanks for all replies

 

[go-stang5.0]

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

 

[1TallMF]

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.

 

[chuck943]

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.

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]

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.

 

[chuck943]

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.

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.]

i guess emmisions can be a good thing too

 

[HISSIN50]

i guess emmisions can be a good thing too

CH4 emissions help after eating a big bean burrrrrritooooo.