Motor is a d15b7 block with d16z6 head
P28 ECU virgin?
DC Sports header

15mph
RPM 1944
%CO2 - 12.00
%O2 - 3.72
HC - 86
CO - 0.01
NO - 1913 [904 MAX]

25mph
RPM 2086
%CO2 - 12.36
%O2 - 2.70
HC - 50
CO - 0.00
NO - 2413 [843 MAX]

O2 seems to be high and NOx is failing me.

Car has new CAT, new Denso O2 sensor (another one on it's way), new fuel filter, sea foamed fuel and oil, 20k mi. old plugs / wires / cap / rotor - new ones on their way, Ignition timing B15. The current timing belt is the VX belt which has 103 teeth and I've heard the SI belt (on it's way) which has 104 teeth is better for this kind of "minime". I'm waiting for a few parts to arrive in the mail. In the meantime what have I missed? 1900 and 2400 are ridiculously high!

 

do you smell your cat everywhere you go?? your also running too rich if co2 is at 12%. whats ignition timing at.

 

can you legally pass smog with that setup?

 

That's what I was wondering too haha

I'm not able to check what it's at right now. But on the smog paper it stated "ignition timing b15" not sure if it's saying the timing at the time was 15 btdc

 

what ecu are you running the d15b7 or the d16z6

 

Head swaps are not legal in california < Taken from the green book they sell in the DMV for 5 dollars.

 

Well let's just jump right in...

O2 - Could be other exhaust leaks through out the exh system. But this needs to be fixed.
If you have a leak in the exh manifold/header the O2 sensor see's this extra O2 and will throw everything off. #1 Also this can greatly affect cat effiency.

You have no CO which is great so I feel the tune-up is not needed.

Timing - Make sure what you are suppose to be at first, Then set it. Retarded a degree or so to lower nox. Don't go over two degrees. This is only good for a hundred or so ppm's.

At 15 your a/f ratio is 17.76
at 25 your a/f ratio is 16.92

So you see you are running lean which is causing the nox.

If you all want to calculate your a/f ratios go to www.smogsite.com and on the left is calculators. click this and scroll down a bit.

 

P28 I believe to be unchipped/stock tune. Would it need to be chipped/tuned?

The vehicle is BAR'd as 92 civic 1.6l and it passed all visuals during the smog test.

It has A/M headers - DC sports. I'll be sure to check for and fix exhaust leaks first, then consider putting a stock exhaust mani on there if it'll help. What can I do to richen the mixture? Are the d16z6 fuel rails adjustable? The fuel injectors didn't look that bad, had buildup around but not directly in the nozzle area.

 

I wouldn't do anything til you fix the exhaust leaks. The stock manifold would be a good suggestion because of the O2 location.

 

Have not found any exhaust leaks. Could the O2 be bad?

a little OT, dude you are the owner of the CRX that disappeared in the Nina Reiser case? That's just INSANE!! I remember watching that Special on TV and how the CRX was involved. Thought it was pretty cool that it was a CRX haha.

 

Yes, it could be the o2 sensor. I have access to a scope to check mine. I would suggest you do the same first. I have had them go bad on me in just over 6 months.

No, My CRX was used by ABC in the 20/20 show as an example. They sent out a photographer and he took about an hour of footage for the show.

The real Paul Reiser's CRX was silver. It was an SI too. I wonder where it is at, it looked clean minus a couple of blood stains...and a seat!

 

hmm i failed my emission cus of NOx too so dont feel bad. Just got a b20b swap onto the crx. My reading for NOx was 2x the amount they allowed. I have no O2 sensor at the moment which i think is the primarily cause that caused me to fail my emission. My CO was at 0.00 on both 15 and 25 test. Somone told me that a CO of 0.00 indicates the O2 is not working or being lazy. Anyhow, keep me update if u find anything since i might need it.

 

CO, to me indicates ignition. Bad ignition will raise CO like if you retarded the timing alot or a weak spark of some kind. Also could indicate a stuck/plugged injector.

NOX is created by combustion temps above 2500 degrees. Compresssion and lean A/F contribute to Nox. Advanced timing and vacuum leaks are the most usual causes besides a bad O2 sensors. Of course a bad cat will raise all of the numbers.

Are they doing the 15, 25 tests in GA. I didn't know that.

 

Tensa_Zangetsu, dude why would you even bother smoging a car missing an O2 sensor?

I don't have access to a lab scope. When I get my hands on a used OEM exhaust manifold, I'm going to put on a new O2 sensor and hope for the best. Right now I'm trying to get the timing belt set right. For some reason, this z6 head did not come with the plastic back plate for the cam which is required to set TDC on the cam. Also the cam itself is not the correct one! it doesn't have the right TDC marking (7'o clock) on it but good thing it has the right number of teeth.

On that smog test, the tech looked at the ignition timing and it was within spec (b15) but I think the TDC may not have been aligned properly because of the above.

So my plan of action is to get the correct plastic back plate and cam, re-set TDC on the cam and crank, new timing belt etc., used OEM exhaust manifold with new denso o2, and resmog with fingers crossed.


OT, well that's cool that they used your car for the 20/20 special. I guess crxcommunity needs to get their facts straight and update that featured crx article. No murder weapon, no body, no car! and the guy STILL gets convicted of murder.

 

Good plan of action!!!

Well they have the car and the body, he confessed. The body was by his mama's house.

Crxcomm... took from what I gave them I was in a hurry when I gave them parts of the story. There is a post where I corrected them. I had typed it out the whole story a couple of times and had to do some smog's, when I came back the forum had logged me out and I lost the good written stories. Just got lazy typing it out three times. It did make for a good read still. Thank's Ollie.

 

Yea they do the 15 and 25 tests in GA. Well i think i have a bad ignition timing cus i used a timing light and think its off but not exactly 100% sure cus im not sure where the timing pointer is at on a b20b. And as u mention about bad ignition will raise CO, well my CO was at 0.00 and i thik my timing is bad as well. Sometimes when i start my car it would bogg a bit and then turns off by itself. Yes, I have cleaned my IACV and since the throttle body was from a 00 Crv it dosent have a FITV.

Sorry to ***** ur thread OP, but we are in the same shoe.

 

He plea bargained and part of the deal was to reveal where the body was. Pretty insane, his mom must have been creeped out!

Tensa, are you serious dude? You don't have a Helms?

http://www.spoonhonda.com/SearchResu...9&Redirected=Y

And I think 0.00 CO on the smog test is a good result, meaning your ignition timing is fine?

 

Before:

 

After:

 

What shall I do now to pass the 15mph?

 

Could just be that your timing is at 17btdc. If your spec is 15 stay to the low side and go 14btdc.

Also your O2 reading is a little high. I would like to see 0.3 at 15 and 0.0 at 25. You must still have a little exhaust leak or the cat is lazy.

When did you put the cat on? how far was it driven since then.

 

cat was put on at 250k. gas cap failed, got a new one. spec is 16btdc +-2 so I should set it at 14? Maybe the donut gasket is bad, I'll replace with a new one.

What about 1 step colder spark plugs? The NGK I have in the motor right now are the 15's and I have a new set of 16's along with new wires.

What octane should I use? I had 91 in the car but drove around til the tank was on E then put a few gallons of 87 in.

 

I would go with either 14 or 15btdc. I would also run 87. With these two it should lower the nox enough.

Plug's I have not messed with yet. I would stay with one step up or down from stock.

 

What about the HC? Will retarding the timing lower that also?

I'm going to set the timing then drive around hard for a while then fill some chevron 87 and get her to PASS.

THANKS!!

 

HC - timing does not effect it as much as long as you stay within the 2 degrees + or -

How I understand the octane thing is 91 octane burns hotter and is harder to ignite.
87 octane is easier to ignite and burns cooler.

I am still wondering why your O2 is still high. Ask the smogtech to (pre-condition) the cat.
Don't ask him to (superheat) the cat as this is a no no. I would suggest a minute or so at 2000rpm before the test.

Have you reset the ECU? You should after any timing adjustments.

Good Luck and keep them fingers crossed