Today I ran a smog test on my car with the PFC. I have a '94 US model with 37,000 miles. Mod's are (M2)Intake, DP and (RB)duel Exhaust - air pump is connected. Idle is 725 and 800 with electric load , boost 11 psi. Here they stick the tester in the exhaust and run the car at 2500 rpm's. To pass you need 1.03 Lambda - I got 1.30.

I did a search in this Forum and could not find anyone who has passed with Mod's similar to mine. I have found some people have disconnected the catch (purge) tank so it will not dump fuel, but this was with a stock ECU. I think this will be the first thing I try. Others have added alcohol (not sure on a safe amount?) . I believe it was Chuck (cewrx7r1) who suggested disconnecting the secondary throttle linkage - using only one port and lower boost, remove fuel.

All of the searches I found are dated sometime back. Now that more people have used the PFC - has anyone passed emissions recently? What did you do? I have only had my PFC connected for a few weeks and have alot to learn. If I can't pass with the PFC I will drop the stock ECU back in before my States test in June. Hope someone can help with suggestion....Thanks

 

With the same basic mods as you I just failed with a PFC and the evap purge tank exit hose capped.

I'm going to KD next to get a proper tune and then try again.

 

I passed UK emissions about two months ago.

They only did idle test, looking for residual HC, which was only 12ppm.

I have stock motor (50K miles), downpipe, hi flow cat, cat back, K&N filter, Power FC and commander.

Not sure how I would have done at 2500 rpm, but I passed that last year with stock ECU and the same setup.

What gets tested seems to vary from station to station and year to year! Thankfully we don't have rolling road tests yet :-)

Richard

 

You should have asked them if you could tune the engine while they are running the test.

According to your comments, they only checked the O2 content of the exhaust. That is so very easy to fix. Go into the PIM RPM map and take out fuel.

 

That is very strange that you didn't pass. I've tested my on a rolling dyno twice and it's even cleaner than the OEM computer. I did replace all plugs, changed oil, emptied the vapor tank and made sure my car was hot ... This is the number one factor in failing any car.

 

Thanks everyone for the quick reply's and information from your emission tests. I appreciate it.

I am going to try tomarrow after work. Last time I just stopped in while they were closing, but they were nice enough to give me a quick reading. First I will try closing off the purge tank and while running the test remove some fuel - as chuck suggested. I leave thursday for the States (high school class reunion) and then have a week before the States emission test.

Chuck or anyone else who can help. I went to page 24 in the manual. Since my test is run at 2500 rpm. Would it be best to take fuel out at 2000 rpm's. I have never done this, as you can tell. Then start at 100% and work down to 99.6 and so on, while using emission tester. I am alittle mad at myself for NOT reading up and NOT testing sooner before I leave for the States. Again, I hope someone can respond or I will wait until I return in June when I have more time to better understand the PFC. Thanks

 

I would take 5% out of the 2k and 3k slots.
Try it on the road and look at you O2 voltage before and after to see how much difference it made.
Play with the percentage more if needed. Make sure that
the O2 idle and timing idle control functions are turned on under the ETC function menu.

 

Thanks Chuck - I follow you until the timing idle part?.
Looking at the ETC page 35-36 ...are you talking about the idel-ig cntrl (pg. 36) under function select ? I will look at the commander during lunch break tomarrow - it's getting late over here. I need

 

That's it. That function varies the timing to increase idle speed stablility. You might try it both off and on when being tested to determine which one gives the cleanest
emissions result.

 

anyway to pass with a mp insytalled?

 

My lambda dropped,but not by much -all of the test below were run at 2500 rpms.

#1 - with 5% or 95.6% taken out at 2k and 3k slots, O2 idle and timing idle turned on and purge tank plugged - Lambda was 1.28 - dropped .02

#2 - with 10% or 90.6% taken out at 2k and 3k slots, O2 / timing turned on and purge tank plugged - Lambda was 1.26. Exhaust started to pop and backfire.

#3 - with 7% taken out at 2k and 3k slots, O2 / timing on and purge tank reconnected - Lambda was 1.32

#4 - is # 2 at idle

CO HC CO2 O2 Lambda COvrai
#1 - 0.017 11ppm 13.25 3.53 1.28 0.02
#2 - 0.016 35ppm 12.5 4.25 1.26 0.02
#3 - 0.014 9ppm?? 11.9 5.44 1.32 ------
#4 - 0.635 199ppm 13.11 3.04 1.158 0.98

I did a short drive before each test. I had to write down the numbers while running the car, because his printer was not working. My friend has a customer so he couldn't help. I forgot to check the O2 volts while driving #1 - #2 , but remember at #3 it was jumping from 0.13v up to 0.84v and down to 0.35v this made no sence to me.

I didn't read your post until after the test,so I did not try turning the functions off. Chuck are any of these numbers i #1,2 and 3 making any sence. I showed it to my friend and he thinks the O2 sensor might be bad on the car? or maybe I'm just not doing it all right?
I ran out of time and had to head home, because I need to get ready for my trip. I didn't think it was to smart to take more fuel out until I spoke with you and did some more searches from other post. I hope when I get to the States my old classmates can cheer me up

Thanks chuck for hanging in with me!

 

It could be the O2 sensor, air pump, ACV system, or even the cat.

Too many posibilities.

 

OC94RX7, There are countless FD's here in the U.S. modified to a much greater degree than yours and in most cases we have rolling dyno testing whhich is much tougher than the sniff test. These cars pass. Fouled plugs are often overlooked, the catch tank should be blown out which you did. Find someone that can give some input as to how you lean your A/F ratio at part throttle. If all else fails, there have been single turbo cars with straight thru exhausts that have passed using a mixture of emthanol or ethanol I can't remember which. Do a search on the forum for recent posts on this.

 

If you're in California or any of the picky smog states, you can't pass with the PFC, but not because of emissions. It's because the "check engine" light doesn't come on when you turn on the ignition. That's an automatic fail.

I guess in the more relaxed emissions states they don't check that or it isn't required....?

 

I passed smog here in Houston.

1994 Automatic w/PFC
Hi-Flow Cat
Apex N1 Dual
DP
Pettit Intake
Greddy SMIC
Greddy BOV
2" Radiator

I actually passed with numbers much better than the average!!!

 

Well I just went here in CA. The tuner has no problems w/ visual, we were trying to tune PFC together . But I am not too familar w/ it and neither is he. Well, I did not pass, but I know I need to change my plugs after seeing how rich I am running. So besdies to pass the test, I want to remove fuel so I can try to acheive bettr power. Would the PIm volt be where to start? Do you adjust all the readings for a particular rpm(1.0 v, 1.5v, etc)?
We played with the fuel/ignition timing correction by adjusting the inj adj down to about .85 and -10% for both leading and trailing. My CO dropped like a rock 7.00% down to .10% and my HCC from 1900 down to 800, yet not good enough and I did not want to adjust too much. But at 2500 rpms, It just shot back to the reg values. I know this is only a test setting, but what does that tell me to change on my reg ign maps?

So, I believe I can pass the sniffer and the visual is already past, I wish there was a good PFC tuner in Bay Area, anyone esp w/ datalogit.

MY mods: PFC, pettit intake, DP, high flow cat, apexi duals, 1200 cc secondaries, Hks ignition amp, CWR IC.

Yes, I probably could locate someone and pay it off, but I want to tune this thing better anyways.

Thanks,
Steve

 

Got back from my trip last week and today took the car in for the emissions test. Kind of funny. The only change I made was adding 10% ethanal, new plugs and oil to my #2 setup from above.
Rev'd it up to 2500 and a minute after noticed some light smoke coming from the exhaust area. I thinking ****! it never smokes! a second guy goes over and I get out of the car. I burned a huge hole thru the ventilation hose attached to the sniffer. The lamda was just slightly high but he passed me. They will definitly remember me in 2 years.
I plan to check the 02, air pump, Cat, etc.. the plugs and tailpipe were clean.
Again....thanks everyone for your reply's.
Oliver

 

I've been waiting to answer this thread.

I passed North Carolina emissions today.

It CAN be done with a ported motor a catco cat and some finesse with the PFC.

Anyone who needs help passing in NC, go see Clean and Fast in Raleigh and they can set you up.

No alcohol, no special cleaning or prepping, just the right map with the air pump and Cat.

Next challenge is to get a GT35/40 to pass...

-Kevin

 

Surprisingly, I passed in NC last month with the sniffer. I didn't have the FMIC, intake, or radiator, but I don't think that would affect it. The results were:
Test Actual Std
HC(ppm) 0043 220
CO(%) 0.00 1.20
CO2(%) 15.2 (no standard)
This engine has about 40k miles on it. I didn't change anything on the PFC for the test, just using base mod maps with about 3% of fuel added via PIM to 2000 and 3000, and changes to the boost and acceleration enrichment numbers.

Good luck!

 

Those are pretty amazing numbers. The Bonez must have a LOT of platinum in it.

Seems impossible (to me) that you were able to use a stock map and pass at idle.

I thought I would be the first to post popping a motor at 750 rpms.

 

Yeah, I was absolutely shocked that it was so clean. I think it might have been because I had a few mods that aren't accounted for in the base mod map such as streetporting. I figured that'd make it dirtier though....

I would have thought maybe there was something wrong with their probe, but I went to another place before them and they did a test reading which was also extremely low.

 

The most like street port add more air = leaner = cleaner

Damn, I'm glad I live in Alabama and dont have to worry about all that mess.....for now anyways, I'm sure one of these days it will change.

STEPHEN