Alright so i put my car on a 5 gas analyzer and my readings were sky high for HC's and CO's. my hydrocarbons were all the way up to 3100 at idle. HC's should be under 150 as a general rule of thumb. The CO's were all the way up to 4.98. Plugs are good, wires are good, and the trailing and leading are correct. What could possibly be making my car spit out that much raw fuel? We put my buddies FD on the same exact machine and he was running 79 on his HC's and 0 on the CO's. We can eliminate a faulty machine. I have no clue why it is this high, ANY input is helpful.

 

Stock car or power FC , Cat or not , was it missing or smooth .

 

I agree. We can not help you if you dont give us more info! Help us help you. Give us the full list of details.

 

Those are numbers that you would typically get without any cats.

How recent is your oxygen sensor? Is your IAT sensor working?

 

No PFC, aftermarket exhaust and a high flow Cat no pre-cat . The oxygen sensor has about 25k on it just like the engine... that was replaced obviously with the engine. And the IAT... i dont know if its working or not i have no monitoring devices, but i guess i could backprobe it with my DMM. Does anyone know voltage specs on the IAT? and no it was not missing, nothing more than any other rotary ive ever owned.

93
3 inch exhaust
High Flow Cat
Streetport
Pettit intake

No PFC
Stock ECU
Stock injectors

I woulda thought leaking injectors... but that should only be at start up that i would have those numbers. and it does it even after 20 minutes at idle.
This car is a penguin killer right now, i can smell the raw fuel pumping out of that exhaust, it makes my eyes and nose burn.

 

The problem with the IAT sensor is that they do not fail all at once and may test ok. Mine would work fine, stop working for 10 minutes during a run, and then start working again.

Can you borrow a PFC?

 

are your airpump and ACV on the car and functional?

 

all emissions are ripped off. And i think i could borrow a PFC from a friend, but does it change all his settings if it is unplugged and put into my car?

 

I would think your buddy's car has emissions control on it.You have no chance of making 70 ppm HC and 0% CO with your car as is (unless the engine has been stopped for 24 hrs and the exhaust system ventilated with clean air!).

 

Not sure why you did not mention that first.

If he has a Datalogit he can save his map.

However, you are not going to pass emissions without an airpump (thought I don't think the numbers should be as bad as you are getting at the moment without something else being wrong too).

 

oh i passed emissions... But i cheated a little... i may have had a VERY hot downpipe when they ran the test. Im not worried about passing the emissions... im just worried about how much fuel is being wasted.

 

due to the way the rotor and exhaust port are laid out, there are some unburned hydrocarbons that get pushed out the exhaust port on every stroke. its why the rx8 uses side port exhaust and meets ulev standards

with a stock ecu, no air pump and no cat, 3100ppm of HC is normal.

if it passed smog without the emissions controls, why did they put em on there in the first place?

 

The temperature required breakdown the exhaust pollutants in the absence of additional oxygen would vapourise your downpipe

 

i think i know what your saying, maybe word it different. But yea i got my downpipe real hot so i could pass emissions.

so far ive got a lot of questions about my car, but nothing that really helps out a lot... anyone have any idea what could cause this?

 

How do you expect to pass without emissions equipment? You might also not be able to pass depending on the size/style of the port. Also, if the engine builder did not use a rear rotor housing in the correct place you will also most likely not pass.

 

You got lots of questions about your car because you didn't supply enough information initially - like the fact that you deleted emissions and have a street port. As the previous poster mentioned, if the street port is big enough you may have lots of unburned hydrocarbons, which in combination with the lack of an airpump may explain your numbers. I would replace the O2 sensor and properly test the IAT sensor and if that does not work get the injectors cleaned.

 

like i said im not worried about passing emissions, i already passed.. all im worried about is how much raw fuel is coming out... its the gas mileage im losing, and shouldnt be.

 

The stock ECU delivers fuel based on the inputs it receives from several sensors. Boost and rpm and the primary inputs but the water and air temperature sensors, and the oxygen sensor also play a role. If any of those sensors are faulty then the fuel delivery will be inaccurate. All of these sensors can be tested with a PFC.

If they check out, you may have faulty injectors. (Or you may just have a very aggressive port.)

 

Without an airpump, your car will run stupidly rich. I had a wideband hooked up to my car, and with stock ECU and no airpump, my car was idling at 11:1AFR. You might as well run a straight midpipe also, your cat probably is dead from running so rich, and wouldn't do anything anyways without the airpump.

Edit: Looking at the FSM, it makes sense. Seems like the ACV is designed to provide air from the airpump to the cat under certain conditions, vent under certain conditions, and the rest of the time the pressure provided by the airpump goes into the lower intake manifold. So the ECU will provide fuel to compensate for the air from the airpump. And without the airpump, your car will run very rich.

Do you have any engine codes?

 

No,no ,no the ACVair goes into the EXHAUST PORTS not the intake

 

ill have to check the sensors i can get to with backprobing, as i dont have access to a PFC

 

i have heard you can pass with no emissions if you use a good amount of alcohol.

 

i passed with no emissions on the car, no alcohol... just taking it to the emissions testing center... and a hot day, and a hot Downpipe.

 

its hard to believe that all you guys still care about emissions on these cars, brand new they ran the thin line dividing legal and not legal for emissions, I used to worry about it and wasted far to much money and time, just keep your car running good and feel free to bolt on some reliable easy power, and dont forget to save some $ for the special smog guys.....if you know what I mean

 

This is false. As mentioned several times in this thread, a properly running FD with a stock cat and functioning air pump will pass emissions by a wide margin. Here is mine with an intake, downpipe, exhaust and HKS twin power:

Test________CO2%__O2%______HC(PPM)________CO%_____ ____NO(PPM)______
______RPM_MEAS__MEAS__MAX_AVE_MEAS__MAX__AVE__MEAS _MAX__AVE__MEAS
15mph_1768_14.30__0.80_|_88__21___22__|_0.52__0.06__0.01_|_704__150__167
25mph_2922_14.40__0.50_|_53__13____6__|_0.50__0.05__0.24_|_738__136___87

With a stock cat, people generally fail the sniffer part of the emission test because there is something wrong with their car.