barely passed sniffer smog test help/input needed picture inside
03-26-14, 12:22 AM
#1
barely passed sniffer smog test help/input needed picture inside
Today I took my s4 rx7 for a smog test and barely passed,unfortunately I have to retest Being the shop found my evap lines going to the canister were reversed and failed me just for that. Now I have to retest but being that I am so close I'm worried I may not pass the HC part of the test. Any input of what can improve my HC results will be greatly appreciated. Here's my setup
S4 rx7
JDM s4 turbo motor
Aftermarket universal o2 sensor
Haven't touched timing but upon checking it appears to be 3 marks off for leading and 1 mark off for trailing
Port air diaphragm forced completely open ( I still get a light amount of airflow through the split air pipe)
Stock cat
Brake booster has a leak I can hear
S4 rx7
JDM s4 turbo motor
Aftermarket universal o2 sensor
Haven't touched timing but upon checking it appears to be 3 marks off for leading and 1 mark off for trailing
Port air diaphragm forced completely open ( I still get a light amount of airflow through the split air pipe)
Stock cat
Brake booster has a leak I can hear
03-26-14, 10:41 AM
#4
MECP Certified Installer
03-26-14, 11:52 AM
#7
a new cat would help, but this is california and the only legal cat is the one you have or a new one which costs as much as your car is worth.
timing also affects emissions quite a bit, though it's not listed on many rotary emissions diagnostic threads. i'm not sure what you mean by the timing being off by a few ticks, there is only 2 ticks on the factory pulleys(1 for lead and one for trailing). if you have an aftermarket pulley set then you'd have to ask the manufacturer what each mark represents. retarding timing will usually lower HC levels, so if your timing is advanced then you should adjust it back temporarily.
to clean out a converter i usually do a water injection treatment on the engine, which helps burn off carbon deposits from oil and normal usage.
timing also affects emissions quite a bit, though it's not listed on many rotary emissions diagnostic threads. i'm not sure what you mean by the timing being off by a few ticks, there is only 2 ticks on the factory pulleys(1 for lead and one for trailing). if you have an aftermarket pulley set then you'd have to ask the manufacturer what each mark represents. retarding timing will usually lower HC levels, so if your timing is advanced then you should adjust it back temporarily.
to clean out a converter i usually do a water injection treatment on the engine, which helps burn off carbon deposits from oil and normal usage.
Last edited by RotaryEvolution; 03-26-14 at 11:55 AM.
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03-26-14, 12:25 PM
#9
MECP Certified Installer
03-26-14, 12:38 PM
#10
the core on most factory cats is also plated with platinum, platinum is the best oxidizer and most efficient but also the most costly to produce.
universal cats use lesser quality precious metals as an oxidizer, hence they are less efficient. adding more cats offsets the issue in most cases but it also hurts performance, and still does not address the issue that california implemented with the OEM cat law.
universal cats use lesser quality precious metals as an oxidizer, hence they are less efficient. adding more cats offsets the issue in most cases but it also hurts performance, and still does not address the issue that california implemented with the OEM cat law.
Last edited by RotaryEvolution; 03-26-14 at 12:40 PM.
03-26-14, 02:32 PM
#11
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Magnaflow has CARB approved cat.
I didn't think they cost that much.
I didn't think they cost that much.
03-26-14, 08:01 PM
#12
Just came back from the same smog shop. I did the oil change and to my surprise no change to my 15 mph and 25 mph sniffer test, exact numbers all across. So it passed for now i'll take it but I will continue to troubleshoot and hopefully net better results in 2 years.
03-27-14, 09:39 AM
#16
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magnaflow cat
Magnaflow has CARB approved cat.
I didn't think they cost that much.
Amazon.com: MagnaFlow 338677 Large Stainless Steel CA Legal Direct Fit Catalytic Converter: Automotive
Amazon.com: MagnaFlow 338688 Large Stainless Steel CA Legal Direct Fit Catalytic Converter: Automotive
I didn't think they cost that much.
Amazon.com: MagnaFlow 338677 Large Stainless Steel CA Legal Direct Fit Catalytic Converter: Automotive
Amazon.com: MagnaFlow 338688 Large Stainless Steel CA Legal Direct Fit Catalytic Converter: Automotive
03-27-14, 12:43 PM
#18
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I just received the second link cat from Magnaflow and the inlet and outlet pipe are too small. I think the stock exhaust size is three inch but the inlet and outlet on the cat are about an inch too small. I may try and order the first link one but It looks like you won't be able to use the heat shields.
