Calling all emissions guru's!!!
#1
Calling all emissions guru's!!!
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.
#5
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.
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.
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#9
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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!).
#10
Eats, Sleeps, Dreams Rotary
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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).
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?
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).
#12
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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?
#16
Eats, Sleeps, Dreams Rotary
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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.
#18
Eats, Sleeps, Dreams Rotary
iTrader: (14)
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.)
If they check out, you may have faulty injectors. (Or you may just have a very aggressive port.)
#19
Rotary Enthusiast
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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?
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?
Last edited by AHarada; 07-29-08 at 02:03 PM.
#22
Eats, Sleeps, Dreams Rotary
i have heard you can pass with no emissions if you use a good amount of alcohol.
#24
the one and only
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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
#25
Eats, Sleeps, Dreams Rotary
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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.