failed emissions

isaac93civ · 09-28-2009, 11:49 PM

Hey guys...

I got a 94 Integra LS B18B1 and i just can't get it to pass emissions. keeps failing on Hydrocarbons and NOx. brand new Cat and o2 sensor... any help please would be great. Thanks!

hlittau · 09-30-2009, 11:43 PM

This is not Honda-specific, but my own general experience with HC is one of basic tune-up issues like ignition system maintainance, plugs wires, rotor, cap etc. My experience with Nox issues is more related to EGR valve clogged or sticking or the EGR passage in the intake manifold clogged.
My B18 head has an internal passage from from the exhaust port to the EGR valve mounted directly on the backside of the head near the distributor. That passage was majorly clogged in my case. On some cars (not really experienced with Honda) you can check this my applying control vacuum directly to the EGR valve at idle and the engine should stumble badly and all but die when you do. If it doesn't your passage my be clogged. A new cat solved mostly CO for me.

SteelCityRacer · 10-29-2009, 11:04 AM

try replacing the pcv valve and play with the timing.... i went to a small garage that wasnt too busy... and i got my car to pass with no cat just playing with the timing dude was cool he wasnt busy so he let me tinker with it till it passed

hlittau · 10-29-2009, 11:43 AM

Was your timing on spec when it passed or did it have to be off spec to pass emmisions?

Here they make you pass with timing spot-on.

SteelCityRacer · 10-30-2009, 02:41 PM

no my timing wasnt set at base when we started.. i have p30 pistons which makes my motor 11;1 compression and i have my timing advanced as far as possible before knock.. i dont know the exact number... but yeah they only do the tail pipe sniffer here for pre obd2 car

09-28-2009, 11:49 PM	#1
isaac93civ New Member Join Date: May 2009 Location: Elmvale, ON Posts: 16	failed emissions Hey guys... I got a 94 Integra LS B18B1 and i just can't get it to pass emissions. keeps failing on Hydrocarbons and NOx. brand new Cat and o2 sensor... any help please would be great. Thanks!

10-29-2009, 11:04 AM	#3
SteelCityRacer Bronze Member Join Date: Apr 2005 Location: Pittsburgh, Pa Posts: 311	try replacing the pcv valve and play with the timing.... i went to a small garage that wasnt too busy... and i got my car to pass with no cat just playing with the timing dude was cool he wasnt busy so he let me tinker with it till it passed __________________ 93' civic si b16 sir2... sold 93' civic cx.... got hit by semi..have a 94 teg now just rebuilt ls with p30 pistons and got a sir2 lsd trans... and more.....

10-29-2009, 11:43 AM	#4
hlittau New Member Join Date: Sep 2009 Posts: 14	Was your timing on spec when it passed or did it have to be off spec to pass emmisions? Here they make you pass with timing spot-on. __________________ 1991 DB1 Project Car 1988 JR (Isuzu Impulse) Daily driver Order subject to change without notice

10-30-2009, 02:41 PM	#5
SteelCityRacer Bronze Member Join Date: Apr 2005 Location: Pittsburgh, Pa Posts: 311	no my timing wasnt set at base when we started.. i have p30 pistons which makes my motor 11;1 compression and i have my timing advanced as far as possible before knock.. i dont know the exact number... but yeah they only do the tail pipe sniffer here for pre obd2 car __________________ 93' civic si b16 sir2... sold 93' civic cx.... got hit by semi..have a 94 teg now just rebuilt ls with p30 pistons and got a sir2 lsd trans... and more.....

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09-30-2009, 11:43 PM	#2
hlittau New Member Join Date: Sep 2009 Posts: 14	This is not Honda-specific, but my own general experience with HC is one of basic tune-up issues like ignition system maintainance, plugs wires, rotor, cap etc. My experience with Nox issues is more related to EGR valve clogged or sticking or the EGR passage in the intake manifold clogged. My B18 head has an internal passage from from the exhaust port to the EGR valve mounted directly on the backside of the head near the distributor. That passage was majorly clogged in my case. On some cars (not really experienced with Honda) you can check this my applying control vacuum directly to the EGR valve at idle and the engine should stumble badly and all but die when you do. If it doesn't your passage my be clogged. A new cat solved mostly CO for me.

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