So I failed emissions... - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

KarateBoy · 11-21-2005, 12:26 PM

My readings were 1.04 for HC and 9.2 for CO

The legal limit for HC is 0.80 and 15.0.

I passed the CO limit by a decent margin but I'm obviously not burning enough fuel.

I ran the test on mid-grade so 93 V-power alone probably won't get me down the extra 0.24 points.

I've been reading that running injector cleaner helps a lot. Does it matter if I pour it in before I tank up or not? I think not as it would all mix together anyway.

I think its also important to not that over the last 2 weeks or so my idle has been getting rougher.

I was standing in line with my car on and not only would the idle flucuate from 500-750 rpm but the car would shake a little? Could it be knocking?

Thanks in advanced

n240sx · 11-21-2005, 02:51 PM

i dont know if you looked at this already, but this may help http://www.zilvia.net/f/showthread.php?t=92585

monkey7 · 11-21-2005, 03:47 PM

You can do it with
Seafoam!

aznpoopy · 11-21-2005, 05:24 PM

get some throttle body cleaner and run it through the engine.

or seafoam, same difference.

warm up the car with a good long drive before you go and try again.

edit: it's not knocking, it's probably your IACV. it, along with your entire intake tract, is gunked up with 10+ years worth of dust from the air. clean your filter too if you haven't.

TheTimanator · 11-21-2005, 06:15 PM

hahaha

out of curiosity i went and got my car tested. I recently got a new exhaust and cat so I thought i'd give it a shot.

Legal limit CO is 1.2 and i got a 8.50

aznpoopy · 11-21-2005, 06:21 PM

wow

you must be running rich as hell.

wootwoot · 11-21-2005, 06:34 PM

adjust your idle!

Var · 11-21-2005, 06:54 PM

Quote:

Originally Posted by KarateBoy

My readings were 1.04 for HC and 9.2 for CO

The legal limit for HC is 0.80 and 15.0.

I passed the CO limit by a decent margin but I'm obviously not burning enough fuel.

I ran the test on mid-grade so 93 V-power alone probably won't get me down the extra 0.24 points.

I've been reading that running injector cleaner helps a lot. Does it matter if I pour it in before I tank up or not? I think not as it would all mix together anyway.

I think its also important to not that over the last 2 weeks or so my idle has been getting rougher.

I was standing in line with my car on and not only would the idle flucuate from 500-750 rpm but the car would shake a little? Could it be knocking?

Thanks in advanced

Change

oil
02 sensor
spark plugs

advance timing

if that doesn't work change your cat.

Run your car hard before the test..that helps warm up the cat..and dont turn it off. Dont let the technician turn it off either.

*crioten* · 11-21-2005, 07:11 PM

if your emissions are way off, its most likely the o2 sensor

pretty much what 420 said lol

11-21-2005, 12:26 PM	#1
KarateBoy Join Date: Aug 2005 Location: Chicago Posts: 34 Trader Rating: (0) Feedback Score: 0 reviews	So I failed emissions... My readings were 1.04 for HC and 9.2 for CO The legal limit for HC is 0.80 and 15.0. I passed the CO limit by a decent margin but I'm obviously not burning enough fuel. I ran the test on mid-grade so 93 V-power alone probably won't get me down the extra 0.24 points. I've been reading that running injector cleaner helps a lot. Does it matter if I pour it in before I tank up or not? I think not as it would all mix together anyway. I think its also important to not that over the last 2 weeks or so my idle has been getting rougher. I was standing in line with my car on and not only would the idle flucuate from 500-750 rpm but the car would shake a little? Could it be knocking? Thanks in advanced

11-21-2005, 06:15 PM	#5
TheTimanator Post Whore! Join Date: Apr 2002 Location: Nashville Age: 41 Posts: 2,535 Trader Rating: (1) Rides Gallery: TheTimanator Feedback Score: 1 reviews	hahaha out of curiosity i went and got my car tested. I recently got a new exhaust and cat so I thought i'd give it a shot. Legal limit CO is 1.2 and i got a 8.50 __________________ 89 S13 hatch/////98 Subaru 2.5RS

11-21-2005, 06:34 PM	#7
wootwoot Post Whore! Join Date: Jan 2004 Location: sarasota florida biatch Age: 39 Posts: 3,850 Trader Rating: (0) Feedback Score: 0 reviews	adjust your idle! __________________ I'm from Florida so I'm probably a bit more strange than you

11-21-2005, 02:51 PM	#2
n240sx Zilvia Member Join Date: Apr 2003 Location: Huntsville, AL Age: 39 Posts: 195 Trader Rating: (15) Feedback Score: 15 reviews	i dont know if you looked at this already, but this may help http://www.zilvia.net/f/showthread.php?t=92585

11-21-2005, 03:47 PM	#3
monkey7 Zilvia Member Join Date: Feb 2004 Location: bay area Posts: 286 Trader Rating: (0) Feedback Score: 0 reviews	You can do it with Seafoam!

11-21-2005, 05:24 PM	#4
aznpoopy Post Whore! Join Date: Mar 2003 Location: New Jersey Age: 44 Posts: 5,013 Trader Rating: (1) Feedback Score: 1 reviews	get some throttle body cleaner and run it through the engine. or seafoam, same difference. warm up the car with a good long drive before you go and try again. edit: it's not knocking, it's probably your IACV. it, along with your entire intake tract, is gunked up with 10+ years worth of dust from the air. clean your filter too if you haven't.

11-21-2005, 06:21 PM	#6
aznpoopy Post Whore! Join Date: Mar 2003 Location: New Jersey Age: 44 Posts: 5,013 Trader Rating: (1) Feedback Score: 1 reviews	wow you must be running rich as hell.