I have a 1995 honda civic dx with a gsr swap, i've taken it to emissons and it failed. it failed because it was too rich in HC and CO, what can I do to fix this problem ? should I throw in a different ecu? or fix the exhuast?


Modified by ricerboi860 at 10:39 PM 8/30/2007

 

bump

 

o2 sensor was my problem

 

was it at 15 mph or 25?

 

i have no idea, but my state law for HC is 167 and mine was 380, the CO limit is 0.89 and mine was 12.51

 

also with it didnt have an o2 sensor when i got the swap done, so the vtec wasnt working so my friend put in a o2 sensor for me and the car is running fine, so i dont know if it is the o2 sensor or not, maybe if i put in a different ECU?

 

need little more info like,wat ecu u running? do you even have a cat? did u warm up the cat? is there a cel(check engine light)?

 

u results are way high. hope you dont gotta retire it? do you?

 

the ecu i'm using obd2 for a 96 gsr, the motor is a 96, i heard putting in a p72 would make it run better and it should pass? the check engine light is on but the guy from emissions dyno it

 

p72 is for a gsr ecu, what did you think it was for? or what ecu are you currently using, a chipped ecu w/ a gsr basemap?

 

have you ever tried to pull the cel code ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by da9blk1 &raquo;</TD></TR><TR><TD CLASS="quote">o2 sensor was my problem</TD></TR></TABLE>

Mine too.

 

check o2...... sounds to me like the cat is missing or went bad #'s are waaaay high

 

my stock EF civic is having the same issue as you, double-digit CO numbers (mine are around 10-11%, it is supposed to be 1.20%) and slightly high HC (mine is 300-400ppm and it should be 220ppm). I have a new O2 sensor and I am throwing codes for a MAP sensor and O2 sensor (but the MAP is causing the O2 sensor code I believe - my car is running so rich because its reading too much air, that the ECU thinks the O2 sensor is "wrong").

Heres my thread: https://honda-tech.com/zerothread/2074464 maybe you can get some ideas and we can solve this ****! I am going to replace the MAP sensor soon and see if it runs better (exhaust smells like gas now). I'll let u know.