fail smog

[s14koukirules]

i have a 1995 240sx ka24de and today again i fail smog, things i did, i changed the catalytic converter, replaced all vacuum hoses from the egr system , and i replaced the egr and canister solenoid valve, but i still failed i did a little better in the numbers any clues what else it can be? THANKS

[spooled240]

probably has something to do with the state you live in


lol but do you have the numbers for the HC's/NOX? that would help

[recoy]

I feel you man... I did EXACTLY the same thing as you did. Just tried again for the second time yesterday, only difference is mines a 91. However, the smog tech told me that due to the fact I have almost 300k on my engine there might be some build up. Also he said that my (legal) intake and exhuast + lots of miles may make your air/fuel ratio off which will destroy your cat converter (mines only 2 years old). I'm not sure how much truth there is in what he said and you already changed yours, so that pretty much leads you to option 2 - Shady Smog, it's not worth the headache.

[singlecamslam]

This might or might not help

http://zilvia.net/f/tech-talk/372184-trouble-passimg-smog-your-ka-look-here.html

[hessianben]

had trouble with this a while back.
some things a retired smog tech told me:

1. top off your gas tank

2. get that shit super hot before you get there
-do some high rpm highway miles right before, and don't shut it off

3. when all else fails, you can run 'denatured' alcohol which will sniff much cleaner
-read up on this first though to find out how much to use (it can also damage rubber seals in your fuel system, so it should be used for as short a period of time as possible)

[singlecamslam]

Running any type of alcohol will lower HC emissions and raise NO emissions, the only real way to pass is to fix it.

[s13 @ fullboost]

yea my advice is on a 1/4 gas go buy some octane booster and pour the whole thing in your tank drive the piss out of it for a little bit then go straight to smog should pass

your hc and nox should drop significantly

[s14koukirules]

probably has something to do with the state you live in


lol but do you have the numbers for the HC's/NOX? that would help here are my numbers, this is when i had new catalytic, new egr solenoid, new egr system vacuum hoses, cleaned egr valve and egr tube HC(PPM)

15MPH-MAX: 61-AVE: 34-MEAS: 9

25MPH-MAX:37-AVE: 21-MEAS:7

NO(PPM)

15MPH-MAX:493-AVE: 170-MEAS:1891

25MPH-MAX:516-AVE: 158-MEAS:840

[STEEZxIT]

Try that Seafoam stuff.

I used it on my dad's mercedes 300CE (carb)

And it did pretty well.

[secondtonone317]

I was just going to suggest seafoam as well, try that out.

[s14koukirules]

how do u do the seafoam on my car and where can i buy it?

[secondtonone317]

suck it in with the brak booster vac line, let it sit for 15 mins, start car up

[STEEZxIT]

autozone..

its self explanatory on the label, but you can watch vids on youtube or read up on google.

You're suppose to divide 1 can into 3 segments. 1/3 in your tank. 1/3 in vacuum hose (brake booster= best entrance) and 1/3 in the oil filler.

If you can get a hold of a spray can's cap.. thats what i use to divide em into 3. Its pretty on point with measurement.

[s14koukirules]

i will try that, but what are chances i will pass smog if i use the seafoam?

[s14koukirules]

This might or might not help

http://zilvia.net/f/tech-talk/372184-trouble-passimg-smog-your-ka-look-here.htmlwhere did u buy that pipe cleaner? i' m going to try what u did

[s14koukirules]

i forgot to mention when i got my cat replaced the one that my car had on was hallow, no honeycomb whats up with that?

[rollout240]

^^^ it means somebody didn't care about nox and wanted to let the engine breath a little better.

[BoostSlideWayz]

I never have good luck on smog emissions.... but i know some places will rip you off.. i had taken my car to a local smog place and he was trying to tell me he needs to replace a few things on the egr and then i took it to an even more strick place and they said i passed fine. so they are not my main place for smog.

Try another place to see if they get similiar numbers.. also, if you have aftermarket exhaust.. a silencer does make a diff... i once failed then put a silencer in and came back 2 weeks later and passed.

[STEEZxIT]

^^^ silencer has nothing to do with smog.

Maybe where you live.

But i went to go get my smog in all my cars WITH an aftermarket exhaust. Sometimes a full catback. Tech said as long as everything is in place and have a good cat, There really no sensor after the catalytic.

[s14koukirules]

I never have good luck on smog emissions.... but i know some places will rip you off.. i had taken my car to a local smog place and he was trying to tell me he needs to replace a few things on the egr and then i took it to an even more strick place and they said i passed fine. so they are not my main place for smog.

Try another place to see if they get similiar numbers.. also, if you have aftermarket exhaust.. a silencer does make a diff... i once failed then put a silencer in and came back 2 weeks later and passed.i don't think he's ripping me off because i been taking like all my family and friends there and i haven't had a problem, so i kind of know him. theres a place next to his shop where they repair rx7 and i seen s14 too and he told to go there, so they can check my car, on monday i will have my car checked.

[s14koukirules]

This might or might not help

http://zilvia.net/f/tech-talk/372184-trouble-passimg-smog-your-ka-look-here.htmlso after u cleaned that hole with the pipe claner u passed smog?

[singlecamslam]

Your numbers are really high, i would do what that write up says as well as taking the egr and cleaning it. Since you have an s14 you dont have the stupid vacum shit in the back of the car like the s13's. Something is up with your egr, see if its working properly first, than go from there.
Edit: If nothing at all helps, than you might have carbon build up on the actual piston, but i bet your intake manifold is super clogged. Try taking those plugs off and see what it looks like, if its clean than you have other troubles.
Trust me when i feel your pain, had 10+ s chassis, none of them passed on the first try.

[S13Disco]

EGR issue... NOx is super..clean the intake ports and make sure the egr is working prpperly

[1on1]

from a friend who recommended me to do seafoam. Make sure you use your old plugs (or buy new ones) when you do it.

[Rigo91]

was ur idle messed up as well?? by that i mean did the needle jump up and down??

[upsdude]

change your oil too one of the smog techs told me that once-worth a try along with the seafoam...and driving your car around for like 30minutes to get the exhaust system nice and hot. and to think you get to do this shit every 2 years! isn't it fun!? fucking california :(

[Bambi]

You could try this after seafoaming.
Amazon.com: CRC 05063 Guaranteed To Pass Emissions Test Formula - 12 Fl Oz.: Automotive (http://www.amazon.com/CRC-05063-Guaranteed-Emissions-Formula/dp/B000CIPUR8)

It's worked for some people I know.

[s14koukirules]

Your numbers are really high, i would do what that write up says as well as taking the egr and cleaning it. Since you have an s14 you dont have the stupid vacum shit in the back of the car like the s13's. Something is up with your egr, see if its working properly first, than go from there.
Edit: If nothing at all helps, than you might have carbon build up on the actual piston, but i bet your intake manifold is super clogged. Try taking those plugs off and see what it looks like, if its clean than you have other troubles.
Trust me when i feel your pain, had 10+ s chassis, none of them passed on the first try.i already checked my egr valve and its working fine, i m going to try to do the write up, i also think is the intake manifold, because i already change all egr system vacuum hoses plus the solenoid, will see what happens.

[s14koukirules]

was ur idle messed up as well?? by that i mean did the needle jump up and down??
no its fine

[dued]

I went to Home Depot & found a brush that could be used for the intake manifold cleaning. It's called a dryer vent brush.

[sickstatus]

You could try this after seafoaming.
Amazon.com: CRC 05063 Guaranteed To Pass Emissions Test Formula - 12 Fl Oz.: Automotive (http://www.amazon.com/CRC-05063-Guaranteed-Emissions-Formula/dp/B000CIPUR8)

It's worked for some people I know.

When I didn't pass smog, I tipped the guy $40 for his efforts and so he oh so kindly gave my car another go while I went to the liquor store and my car suddenly passed the second time. It was great. ;)


I used this couple days ago, put it in my gas drove a full tank and put 91. Changed my timing to 18 degrees and I passed smog. I'll post results later.

[joshchewuhh]

seafoam through egr/fuel and mix e85 with your 91 octane fuel, heat the cat up, put 50 psi in rear tires. Worked for me when i had high nox and failed

[ddf2006]

for my car i ran 91 gas, and retarded my timing. passed with my egr going bad.

[joshchewuhh]

for my car i ran 91 gas, and retarded my timing. passed with my egr going bad.


how? they check ur timing

[s14koukirules]

I went to Home Depot & found a brush that could be used for the intake manifold cleaning. It's called a dryer vent brush. thanks for the info i ll go to home depot tomorrow,THANKS

[sincity_sil80]

seafoam through egr/fuel and mix e85 with your 91 octane fuel, heat the cat up, put 50 psi in rear tires. Worked for me when i had high nox and failed

how does increasing your tire pressure help you pass smog?

or were you being sarcastic?

[S14DB]

i forgot to mention when i got my cat replaced the one that my car had on was hallow, no honeycomb whats up with that?

You have a KA S14 I assume. The cat is in your downpipe. That fake cat in the S13 locations is for the Japanese models(some CA models had a 2nd cat but it is rare).

You have your 4-1 manifold then a big J shaped pipe. The cat is in the J under the heat shield.

[ShimiBoi]

hey, i work for the smog ref at el camino. if your nox is high it could either be because your cat is bad, or because your engine is running too lean/hot (egr not working properly or vacuum leak), or a lot of carbon deposits causing higher than normal compression. try retarding your timing +/-3deg which is max. try seafoam to clean out carbon deposits. and try cleaning out your egr, making sure that the diaphragm is still good and not torn. since you changed your vacuum lines, make sure that none of them are leaking. pm me if you have any more questions. hope this helps, gluck!

[s14koukirules]

You have a KA S14 I assume. The cat is in your downpipe. That fake cat in the S13 locations is for the Japanese models(some CA models had a 2nd cat but it is rare).

You have your 4-1 manifold then a big J shaped pipe. The cat is in the J under the heat shield.yes i have a s14 ka, do u think i didn't pass smog because i didn't replace the cat u say that is in the downpipe, i just replaced the hollow one? was it useless that i replaced the hollow with a real cat?

[S14DB]

yes i have a s14 ka, do u think i didn't pass smog because i didn't replace the cat u say that is in the downpipe, i just replaced the hollow one? was it useless that i replaced the hollow with a real cat?

It is not useless, it's not hurting anything leaving it in. It's probably a 2-stage which is how most cars with 2 cats are setup. If the stock 3-stage is gone the add on isn't going to fix it. You could be poisoning the new cat if the 3-stage is contaminated and no just dead.

What where your numbers before the new cat?

With those super low HC and high NOx I would say you are running lean. Before you change the primary cat($$$) I would check:

Vacuum leaks. Hook up a gauge and see how much vac you are pulling at idle. Check the intake tube after the maf too.
Engine Timing. Use a Timing light to check that the base timing is correct.
Coolant Temperature Sensor. The 2 pin one for the ECU not the 1 prong for the cluster.
O2 sensor. If this is still the stock one it should be replaced anyways. Increase your MPG too.
Leaks in the exhaust system. Look for leaks around the head to manifold and manifold to cat.
MAF. Unlikely or the car would be running like shit all the time. Should be 1.3~1.7v at idle and 1.7~2.1v @2500rpm

If all these check out then I would get a new primary cat.

#4 is your primary. #5 is the empty secondary that you replaced.
http://www.dealerdirectparts.com/v/vspfiles/photos/3795260.gif

[essforteen]

100% guarantee pass!

1 gal E85 per 3/4 tank of 91
Seafoam in Fuel and Brake booster vac line
heat up Cat drive alot!
High PSI tires = less load drag

The final part is what fixes high NO

Split your fuel pressure regulator vacume line with the egr valve
this has the Egr always open to richen up your car thus reducing NO
then the E85 will lean out your car

High NO is caused by running supper hot which is caused by running leenish
thats what the egr is puts more combusted fumes there to cool down the ignition in the cylinder

Im no pro but that works

[singlecamslam]

100% guarantee pass!

1 gal E85 per 3/4 tank of 91
Seafoam in Fuel and Brake booster vac line
heat up Cat drive alot!
High PSI tires = less load drag

The final part is what fixes high NO

Split your fuel pressure regulator vacume line with the egr valve
this has the Egr always open to richen up your car thus reducing NO
then the E85 will lean out your car

High NO is caused by running supper hot which is caused by running leenish
thats what the egr is puts more combusted fumes there to cool down the ignition in the cylinder

Im no pro but that works


That last part will cause you to fail visual. All smogs i went to checked vacuum lines and especially look at the EGR. But might work if they dont, actually that sounds like a very good idea. So you basically use the vacuum from FPR instead of the other solenoid right? I'm gonna try that next time instead of getting dirty.

[essforteen]

Obviously you hide it! Read the vacuum diagram its just bypassing BPT valve

Ive done it and car was taken to a really anal smog tech and passed!