Failed Cali smog yesterday.......Got a new cat and it helped a lot but my HC levels are still way over. Max limit is 88 and my car was 209. Just wanted to ask what other forum members do to keep the HC levels down. Car is a 93' R1 with intake, DP and exhaust.

 

2 gallons denatured alchohol to 5 gallons gas.....

 

You should easily pass with those mods. I have seen a streetported and polished 93 pass and it had EVER bolt on possible. It had a bonez cat. The car was almost a zero emission car. Change your plugs, filter etc.

If that doesn't work go to Rick's Rotary in Pleasanton. He will straighten out you problem.

 

Make sure your cat is fully warmed up. Set idle to about 950 for the test.

 

Try changing the oil, spark plugs, and a new air filter. There is a huge thread on passing California smog in the West section. https://www.rx7club.com/showthread.php?t=454152

-s-

 

Thanks for the replies......I went through that entire thread all 17 pages yesterday when I got home.

 

just wondering is it possible to run a no boost map on a pfc to help with the smog issues

 

add more fuel. I had to add fuel to help the cat process HCm lower NO and too low of CO.

 

Failed again.........This time with new plugs, oil and filter change and new o2 sensor. Also ran the car with denatured alcohol( not sure if I ran enough). Everything seems to have helped a little as my HC levels dropped from 209 to 160. This time around I even passed the 25mph but failed on the 15mph.

 

what was the co and nox?

 

CO levels at 15mph were .05 (max is .52)and NO was 0 (max is 704). Looking over the test results again I just passed the HC levels at 25mph. Max level is 53 and mine was at 53.

 

Did the tech put the car in 2nd gear during the high speed test? That will kick in the air pump which will lower your emission.

Go to a station that has done many RX7's. Ask your rotary shop for recommendation.

 

Your car is too lean, try making it richer.
CO number 0.05 shows a slight lean condition.

My car pass with about 17% more extra fuel on 2000rpm range, 5% more in 3000rpm and 1000rpm range.

Reza
New plug,

 

I was thinking that the car was running to rich. From what I have found the HC levels read unburned fuel. That is the only reading that I'm failing. As for running the car in second gear the tech was tried about 6 times in a couple of different gears and these were the best results that we got.

 

So, do you have an air pump? How about PFC??
How old is the new cat that you bought?? Is it new new or used new?
If you fail again, borrow someone's pfc and see if you could pass it with that.

Oh, in general, like someone suggested, add some EtOH and make sure your car is well heated. Good luck`

 

What happened on mine is that the modification on cars, plus alcohol made it run leans and misfires in those low ~2000rpm. You can't hear or feel the misfire, but the number shows.
So what I did is made it rich, and fill up tank to dilute the alcohol further.
This works for me shown by about 14 smog papers.

Mod are, K&N intake, downpipe, hf metal cat Dynatech, N1 Dual, Greddy SMIC. Even when put on stock ECU, it is running to lean.

Reza

 

Yes, the air pump is still on the car. Still running the stock ECU. Brand new universal cat was installed on Monday after failing my first smog test and this last test was on Friday. I did run denatured alcohol in the tank after the my first attemp on Friday.

 

So are you saying that running the alcohol was bad idea? Bad in the meaning that it leaned out the car too much at low RPM's?

 

I am saying that is what I have to do to my car. I kept on making it rich until at one point, it is too rich, and the CO is over the Max. The adjustment done on the Commander on the PIM adjustment.

It can be clearly seen on this chart below, hows the HC, CO, NO, O2, CO2 relates to each other as the car goes lean or rich. I used that graph to put my car in the middle. For some reason, the AFR on my wideband has to be around 13.2 at 2000rpm for the car to be near pass.

Again this is on my car with no emission parts other than airpump and catalytic.
So your mileage may vary...

 

Thanks for the reply.....But in my case I'm still on the stock ecu so I can't really make any adjustments on the AFM. Do you know if the air pump helps with HC levels?

 

Hello everybody. Yes I failed my Smog test this morning. My result were HC 144 and CO% 0.93 for 15mph. And for 25mph were HC 79 and CO% 1.00. Can anybody help me out? Thanks.

 

I'm similar to that. However, I have a PFC, as well. I came within one or two points of failing some of the measurements.

 

You have to have a properly functioning air control vavle in order to pass smog. The air control valve directs air from the air pump to the engine or the cat or both. If your cat does not get any air injection, it would be pretty hard to pass CA smog. Read up on how to check on the air control valve from the fsm.