Failed smog at the ref...can anyone help

95 B18B (everything stock) in my 94 civic with recent oil change, new belts

the B pipe and muffler are OE civic

engine has about 200k but the cat has about 62K

failed due to high NOx

 

interested ..... to those automatic pass bottle things work?

 

high nox is commonly an egr problem. Your passage in the head may be plugged with carbon or the valve may be stuck closed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blkb18 &raquo;</TD></TR><TR><TD CLASS="quote">high nox is commonly an egr problem. Your passage in the head may be plugged with carbon or the valve may be stuck closed.</TD></TR></TABLE>

Since when do Integra's have an EGR valve?

 

have never seen a egr cause to faill the emission test. try adding some 44k from the honda or acura dealers. it cost about 25 bucks or so. sound like yur car is not burning the left over fuel in the system.also might check yur spark plugs to see if there good or not.

 

How about your catalytic converter(s)? How old are they (it)?

And...when is someone going to show me an Integra's EGR valve???? I have yet to see one...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ScreaminTeg &raquo;</TD></TR><TR><TD CLASS="quote">How about your catalytic converter(s)? How old are they (it)?

And...when is someone going to show me an Integra's EGR valve???? I have yet to see one...</TD></TR></TABLE>

My Integra has an EGR valve. (check sig)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kusyurdaddy &raquo;</TD></TR><TR><TD CLASS="quote">have never seen a egr cause to faill the emission test. try adding some 44k from the honda or acura dealers. it cost about 25 bucks or so. sound like yur car is not burning the left over fuel in the system.also might check yur spark plugs to see if there good or not.</TD></TR></TABLE>

Doubtful.

Unburned fuel would be high amounts of HC.


NOx is caused by high combustion temperatures (2500*F+ to be exact). How old is the motor? Could it possibly have so much carbon built up in it where it raised the compression ratio? Is your timing advanced?

 

Retard your timing all the way and you should pass.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ozzyman &raquo;</TD></TR><TR><TD CLASS="quote">Retard your timing all the way and you should pass. </TD></TR></TABLE>

cant pass with retarded timing also. after it passes the sniffer test, it gets shot at by the timing gun.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ozzyman &raquo;</TD></TR><TR><TD CLASS="quote">Retard your timing all the way and you should pass. </TD></TR></TABLE>

considering its a circle, retarding the timing all the way really means nothing, you could technically keep rotating the shaft untill you are back to standard timing, and if you did just a 180 degree turn your car wouldnt run... but i know you meant 5 degrees

 

i used heet antifreeze water crap crap

it lowered mine by -100

 

The cat has about 60k on it so it should be good. Before I installed this cat I also had high HC and CO. Now with this cat the only thing still high is the NOx. My engine does not have an EGR. The engine has about 200k on it so I plan to take the head and intake manifold off and clean it out…hopefully cleaning out the carbon build up will help.

Any other advise???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DSZ882 &raquo;</TD></TR><TR><TD CLASS="quote">The cat has about 60k on it so it should be good. Before I installed this cat I also had high HC and CO. Now with this cat the only thing still high is the NOx. My engine does not have an EGR. The engine has about 200k on it so I plan to take the head and intake manifold off and clean it out…hopefully cleaning out the carbon build up will help.

Any other advise???</TD></TR></TABLE>

A modern catalytic, will break down the NOx to get the O2 needed to finish the HC combustion. Olders cats didn't have that, and thats why they needed a "smog pump" to add air to the exhaust. Possibly you have an older style cat?

My Spitfire always tests no HC, but a ton of NOx, and its because I removed the EGR. Retarding the timing as much as possible (within the range of passing) and adding more fuel (running slightly rich) should help with passing. If that doesn't work, go get a can of the "Guaranteed to Pass" stuff and try it. Using it didn't reduce my NOx that much though. You can also try using "Iso HEET" which is isopropyl alcohol and burns cooler than gas.

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

Unburned fuel would be high amounts of HC.


NOx is caused by high combustion temperatures (2500*F+ to be exact). How old is the motor? Could it possibly have so much carbon built up in it where it raised the compression ratio? Is your timing advanced?</TD></TR></TABLE>

This is correct. Its high temp combustion tha causes NOx, which then causes acid rain.

 

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

cant pass with retarded timing also. after it passes the sniffer test, it gets shot at by the timing gun.</TD></TR></TABLE>

Ouch, I forgot Cali was that strict.

Make sure you actually have a 3-way cat and not a 2-way. The 3-way burns the HC, CO and NOx. 2-way is only HC and CO.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SlamminS85 &raquo;</TD></TR><TR><TD CLASS="quote">

considering its a circle, retarding the timing all the way really means nothing, you could technically keep rotating the shaft untill you are back to standard timing, and if you did just a 180 degree turn your car wouldnt run... but i know you meant 5 degrees</TD></TR></TABLE>

You cant turn your distributor 360 degrees... you cant even turn it 180 degrees. If you retard your timing all the way it will help with passing, but since it was mentioned above that they check timing that wont work.

 

Change your 02 sensor........it should bring your NOX's down.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ozzyman &raquo;</TD></TR><TR><TD CLASS="quote">You cant turn your distributor 360 degrees... you cant even turn it 180 degrees. If you retard your timing all the way it will help with passing, but since it was mentioned above that they check timing that wont work. </TD></TR></TABLE>

1. sure you can, put the cam in the wrong way
2. the dizzy spins a 360 when you crank from TDC 360 to TDC again... so yeah it does spin, but im just being stupid... and you CANT retard it that much because it obviously wont run

 

get your timing set to 16 degrees, but it can be + or - 2 degrees for state ref

I would also try seafoam to eliminate the carbon build up before taking the motor apart

 

dont take your motor apart.

Seafoam

Just make sure your in the middle of nowhere

 

I used one and a half bottle of seafoam before going to the ref.

well i am going to try engine decarbonization to see if that helps

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SlamminS85 &raquo;</TD></TR><TR><TD CLASS="quote">

1. sure you can, put the cam in the wrong way
2. the dizzy spins a 360 when you crank from TDC 360 to TDC again... so yeah it does spin, but im just being stupid... and you CANT retard it that much because it obviously wont run
</TD></TR></TABLE>

What do you mean put the cam in the wrong way? The cam has nothing to do with rotating your distributor. Let me see you <U>loosen</U> the 3 12mm bolts on the distributor housing and turn it 360 degrees.