i failed inspection the other day...
i am throwing a cel
intake air temp sensor...


my nox was like 2000
and my hcl was also to high

its a 92 cx..
but i swapped a b16a and i'm running a chipped p28

any one with any suggestions....
other than fixing the light and everything will be alright
i also have 4-1 headers and stock cat .. with a 5 zigen cat back

 

u tried retarding the timing?tuning the ecu to give lower fuel pressure? and change that sensor maybe that might work? and make sure the car is really nice and hot warmed up. put one of those big power fans in front of the car.
hopefully that helps you out good luck

 

Your hc's are high because the ecu is chipped. The Nox is probably because of advanced timing. You need to fix the temp sensor, and find a less agressive ecu. Is the header legal, or will they over look it? If there are any exhaust leaks that may cause high Nox too.

 

yeah, a faulty IAT will cause your car to be excessively lean causing a spike in HC and NOx. Or in some cases it can cause a spike in CO and a drop in NOx. either way borrow or unchip your ecu, and get the MIL (malfunction indicator light(proper term for CEL)) fixed.

 

jdm b16a all gens motor have hard time passing tell from experience good luck

japan has no emissions soo most off the cars don't run right from the start

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Oh Crap &raquo;</TD></TR><TR><TD CLASS="quote">yeah, a faulty IAT will cause your car to be excessively lean causing a spike in HC and NOx. Or in some cases it can cause a spike in CO and a drop in NOx. </TD></TR></TABLE>

No, if there a check engine light, it usually goes into a rich safe mode. A lean condition wouldnt cause high HC anyway. HC's are caused by unburned fuel, you dont get that from a lean condition.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostn420 &raquo;</TD></TR><TR><TD CLASS="quote">

No, if there a check engine light, it usually goes into a rich safe mode. A lean condition wouldnt cause high HC anyway. HC's are caused by unburned fuel, you dont get that from a lean condition.</TD></TR></TABLE>

number of things cause NOX, LEAN is one like brother up said your cooling system not working right, coolant temp sensor has a lot to do with that, your cylinder temp to high are just some causes off high nox.

99% off all JDM b16 have high nox problems its the motor most off the time

also carbon buildup cause high nox also

 

could your catalytic converter be shot considering your running a rich mixture and have alot of unburnt fuel. because exessive unburnt fuel will ruin the converter.
just another thought

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostn420 &raquo;</TD></TR><TR><TD CLASS="quote">

No, if there a check engine light, it usually goes into a rich safe mode. A lean condition wouldnt cause high HC anyway. HC's are caused by unburned fuel, you dont get that from a lean condition.</TD></TR></TABLE>

A lean condition will cause high HC, it's called a lean misfire. HC or Hydro Carbons is caused by, yes unburned fuel or misfire. CO is too much gas.

How CO and HC work. If you're running rich, you get high CO and high HC. If you're running really lean you get low CO and high HC. If you're running just right, you should have about .23% or lower CO, and about 60ppm of HC. runnign Lean also causes HIGH Nox cause your combustion chamber gets "hotter", when you're running a lil richer, it reduces NOx, but increases CO and HC a bit. IMO if you use the USDM B16 cam, you just MIGHT have a chance of passing. My 02.

What are the actual readings?