First off I did search but no one has the direct problem I have.

I have a b18c (japan spec) motor that I am trying to get bar'd but now they pre smog them too so if you fail emissions you cant get your label.

Anyways This is the second time ive gone. First time I went I had everything good I had just purchased an ecu off a guy on here and he said it was stock but when i put it in my car ran like sh**. but I was like well i have never ran and stock ecu so maybe this is just kinda how it is. So i took it in and i failed emissions and @ this time I had DC headers (carb legal for b16) on their.

Second Time I went which was yesterday I swapped the ecu back to my hondata p28 and i just put it in the p72 case so it looked like a p72. ( i used this ecu because when i put the p72 in it ran like someone took a dump in the motor). I also changed back to the stock headers. So everything is stock except a skunk2 IM that is carb legal.

This time I failed even worse and it came up gross polluter on both high speed and low speed, but it runs 100x better with the p28 ecu. the tech who was trying to ref it told me to check the o2 sensor (which i will be doing shortly with my co workers snap-on scanner) and check the cat converter. He said maybe I had a 30$ o2 sensor and that the cat was old. The o2 sensor is a direct fit Denso sensor and the cat is a magnaflow highflow with a carb #. I have had both for just over 2 years and the have MAYBE 10k miles on them. I hardly drive this car. So that does not make sense to me

The only Things I am thinking it could be is that from the wire harness I have 1 green plug left that there is no where to plug it into. ( looks like the green plug that goes into the IACV) however when it is not plugged in (like it is currently), i open my data logger on hondata and there are no CEL or codes stored that Hondata is telling me are a problem. It runs like a champ and my CEL is not even on.

second I am using injectors that I purchased from a guy (I assumed they were gs-r injectors) and that is what I am using now. *However I do have the injectors that came with the motor.

Also I am using an LS fuel rail. (long story it was for fitment issues on the sk2 manifold)

FInally I am using the distributor that came off my US spec gs-r. I wanted to put the japan spec one on but when i looked at them the Japan spec one was a considerable amount bigger. So my buddy who worked at the ref said i would probably be better of using the US spec one.

I will upload the picture of my smog test but for now I will present numbers as they are saved in my phone and I am at school.

HC (ppm) 15mph max (89) Measured 156
25mph max (54) Measured 122

co (%) Max (0.37) 15mph Measured 0.43

NO (ppm) 15mph max (495) Measured 2368
15mph max (746) Measured 1858

Any help/guidance would be greatly appreciated. and if it matters this motor was purchased a few months ago Via (hmotors) and i have put EXACTLY 163 miles on it since ive had it.

EDIT:

This is when I first went

Here is the recent one

 

Put stock headers on there if you can, they retain exhaust heat better so the cat will stay in it's operating tempature range better. What cat are you using? I used a random tech cat on my gsr crx and in the process of a few months, it went from passing to a gross polluter. Aftermarket cats are ****. If you must get one, smog it asap after install! I ended up buying a OEM acura cat and my car ran 0's(that's right, ZERO'S) on most the smog test!(cali dyno smog) Also, run the stock ecu, if my my gsr w/ 11.3/11.5 to 1 compression, itr cams, ported head, and S2 manifold passed, there is NO reason yours shouldn't pass. Unless something else is fuc*ked up

 

If you just want a little cheating:


Dropped HC and NOx on an 88 Civic 30% or so. Car was stock, but was old, tired, and running poorly. Allowed the car to pass without any other modifications.

 

Sorry I forgot to mention I do have my stock headers on there. Only aftermarket thing on the exhaust is the magnaflow cat. But your saying its most likely bad? because aftermarket ones go back quickly ?

 

are you running an aftermarket cat?

 

How old/how many miles are on said aftermarket cat??

 

Also have you done a tune up recently?? ie: plugs, maybe wires, cap & rotor, pcv valve, oil change, air filter, and most importantly a valve adjustment.

 

I have a feeling the reason your failing is that is not a 50 state legal cat...most cats are 49 state legal and CA requires a "better" cat. go find someone who will let you borrow their OEM cat and take another crack at the sniffer with the stock ecu for that motor.

 

Yes it is a magnaflow hi flow cat

On the cat and o2 sensor is at most 10k

I have changed the plugs. pcv, oil change, air filter. NOT a valve adjustment.


I remember when i purchased it i was SURE to get a 50 state legal one. I believe I have the box and or the reciept. I will find out what one it is and link it on here for you guys to see.

 

I would do a valve adjustment...if not for emissions, then just to make sure nothings messed up

 

I called acura to get a price for the cat and it has been discontinued. LAME. So can i just use the one from a 94 ? dc chassis ? seeing as how my motor is from that year ?

 

I assume this is an obd1 vehicle? If so, I just purchased a new cat. from magnaflow. (#36134) Cost me $185 installed. I'm going back Monday to test again. Post up your smog sheet. I want to know what you failed on.

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/ca-bar-ref-failed-92-vx-95-b18c1-2857604/

 

I have now added both smog tests. the first one a few months ago and the most recent.


And the difference between them is that I changed back to the hondata ecu running the stock p72 basemap. Too I have the stock headers on in the second one.

 

you need to put it back to stock and make it run correctly stock. this includes stock cat and stock ecu (not a chipped or tuned ecu)

 

There lies the problem. I do not have the stock cat. and the only thing not stock on there is the skunk2 manifold (carb legal) and the hondata ecu which i tried to see if it would change my results