Well, this is the second time in about 2 years that my cat has messed up. The damn "honeycomb" in the cat just melts off and clogs my exhaust. I use aftermarket free flow cats too. What cat do you guys use with your B16's? Have you guys had any problems with yours? Maybe my B16 gets too hot for a cat?

 

maybe all that nox killed your cat

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bossman032 &raquo;</TD></TR><TR><TD CLASS="quote">maybe all that nox killed your cat </TD></TR></TABLE>

But my JDM 1st gen B16a is an ULEV.

 

i know it may seem like 'taking the easy way out' but you could always just replace it with a test pipe...then when smog comes around just bolt the cat back up...will a clogged cat pass emissions?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by X-Static &raquo;</TD></TR><TR><TD CLASS="quote">i know it may seem like 'taking the easy way out' but you could always just replace it with a test pipe...then when smog comes around just bolt the cat back up...will a clogged cat pass emissions?</TD></TR></TABLE>

Yeah, my friend (the mechanic) was suggesting that, I think I may have to go that route.

 

did ur car ever pass smog with that cat??

high nox, hc will kill the cat eventually

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bossman032 &raquo;</TD></TR><TR><TD CLASS="quote">did ur car ever pass smog with that cat??

high nox, hc will kill the cat eventually </TD></TR></TABLE>

Oh yeah it passed, with some extra incentives.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EL Vap133 &raquo;</TD></TR><TR><TD CLASS="quote">

Oh yeah it passed, with some extra incentives. </TD></TR></TABLE>

well looks like your motor is killing your cat if it took incentives to pass

jdm motors run hell clean lol

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bossman032 &raquo;</TD></TR><TR><TD CLASS="quote">

well looks like your motor is killing your cat if it took incentives to pass

jdm motors run hell clean lol </TD></TR></TABLE>

Well that I didn't know, but I guess I do now huh?

 

Anyone else have this problem?

 

Yes. Have you replaced your O2 sensor(s)?

This change let me pass emissions without "extra incentives", and also helped increase gas mileage (about 3-4 mpg).


Also, what condition is your distributor in?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by milk &raquo;</TD></TR><TR><TD CLASS="quote">Yes. Have you replaced your O2 sensor(s)?

This change let me pass emissions without "extra incentives", and also helped increase gas mileage (about 3-4 mpg).


Also, what condition is your distributor in?
</TD></TR></TABLE>

Haven't replaced them yet, but I haven't been throwing any codes to replace them. Dist is fine, no problems yet. Cap and rotor are new too.

 

i got a b16 but i have never had that problem. just get a test pipe, then if or when you got to go threw emissions, just throw the old cat back on

 

Yeah, I think I may have to do that.

 

My o2s were very bad and did not throw codes.. Changing them brought the nox from 550 down to 170... I had to check the resistance on the 02s for Cross counting.. Mine were just stuck at a flat number. Im noticing a huge improvement in gas mileage... Im getting like 40 in stock b16 w/ thermal exhaust

Im also noticing less black soot in the tail pipe... The o2s were very black when removed

I wish I would of changed 02s at the beginning of my swap. Im in the same boat, I have to do the cat to pass now. My guy will pass visual but wants it to be clean running

good luck..I went with the walkers off oxygensensors.com..I think it was $68 for two shipped

 

Only 2 things kill your cat... running lean or running rich.

Running lean is worse.
Running rich is typical of the JDM ECU's.

NoX, Co... blah blah blah... those are just readings the SMOG people get.... they aren't the conditions of the motor. It's the lean or rich condition that gives you those readings.

Anyway, if you want it absolutely right then you should look into getting your car tuned with a custom chip for your car. You could do this with a homemade wideband and a homebrew ECU tuner like turboedit or uberdata (program depends if you are OBD-0 or OBD-1). Burn your own roms and get your wideband readings corrected to an optimum stoitchiometric level and you should be good to go.

 

my stock cat took a dump on me after 150k, now i have a carsound cat i swap out with the testpipe everytime emmisions come around

 

Look at the maintenance schedule for replacing the O2 sensors - it's very short for what a PITA they are to change, IMO.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Monty &raquo;</TD></TR><TR><TD CLASS="quote">My o2s were very bad and did not throw codes...I wish I would of changed 02s at the beginning of my swap. Im in the same boat, I have to do the cat to pass now. My guy will pass visual but wants it to be clean running

good luck..I went with the walkers off oxygensensors.com..I think it was $68 for two shipped</TD></TR></TABLE>

I also <u>did not</u> throw any codes before deciding to replace both my O2 sensors.

 

Alright guys, I'm gonna replace them suckers. Thanks a million.