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Old 04-26-2004, 07:54 PM   #1
obyone
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Default There's hope for you monkeys yet. (Emissions related)

Backround info: I live in Chicago IL....that is all. No really, Illinois just enacted a new law where 96 and newer cars don't even run the dyno anymore. They just hook them up to the OBD II scanner and download all the info. Seems simple right? Well it's not so simple if your car is running a CEL from your aftermarket parts.

I've modded my RS, almost crazy style, and was surprised I passed Illinois emissions. I'm surprised because my mom's stock Honda failed miserably. If emission testing were a class in grade school, my mom's car would be the retarded kid.

Anywho, I'm running: Cobb Intake, TWE Stage II Cams, TWE valve springs, Exedy 12.9lbs flywheel, MRT Header back exhaust with a high flow cat, and Stromung axle back.

I took off my MRT exhaust, replaced it with the stock exhaust (Stromung can still on the car) and I passed emissions with flying colors. I was shocked...I was shocked and delighted as my RS failing the test would be the last thing I needed.

So moral of the story is, buy parts that don't throw CEL's on your car or a part you can easily return to stock if you get called for emission testing.
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Old 04-27-2004, 11:30 AM   #2
m750
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I passed emmissions in MA w/ the mrt headers installed. I just cleared my code prior to going into the shop.
AO
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Old 04-27-2004, 04:13 PM   #3
obyone
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Quote:
Originally posted by m750
I passed emmissions in MA w/ the mrt headers installed. I just cleared my code prior to going into the shop.
AO
My code comes back within a half hour of driving. I didn't want to risk it, but wanted to let you know TWE cams and Cobb intake doesn't mean you're going to fail.
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Old 04-27-2004, 11:27 PM   #4
m750
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Mine will come back within a day ish, typically a little while on the hw. Where'd you get the cams? How much were they, and have they been worth it? Do you have any engine management? have you been dyno'd?
AO
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Old 04-28-2004, 06:33 AM   #5
Mulder
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Default

If your state does testing via OBDII scan you can't just clear any CEL's immediately prior to going for inspection. Clearing codes or resetting the ECU by disconnecting the battery will also reset the OBDII readiness tests to a "not complete" state, which will cause you to fail the inspection.
Some of the CEL fixes will also keep the readiness tests from completing.
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Old 04-28-2004, 03:01 PM   #6
Farfrumwork
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I sold me Legacy GT, but I had it through emissions just before.

The front range here (Denver-Boulder, CO) has some of the tightest requirements of the country, but my MRT/Brullen/CAI/Pulley'd 2.5 *just* made it in the NO category.

I was happy that it was still clean, 98kmi and 15kmi with the header/cat. I don't want to pollute to go fast, it's just not necessary.... to be moderately fast anyhow

also, my DOHC only through 2 CEL's (420 code, Cat inefficiency) in the 15k of using the header - and that was when my wife drove it to school (50mi, open road) I told her she needed to get on it more!! which she did

-chad
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Old 04-28-2004, 03:29 PM   #7
Cooljo2.5rs
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Default Back fire

my 01 impreza 2.5 keeps on back firing each time I up shift and press the gas petal...it happens aroung 2-3000 rpm shifts, sometimes the check engine light comes on (happened already 4 times this past 2 months) when this occurs. My car farts bad..Any solutions?
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Old 04-28-2004, 05:11 PM   #8
obyone
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Default

Quote:
Originally posted by Mulder
If your state does testing via OBDII scan you can't just clear any CEL's immediately prior to going for inspection. Clearing codes or resetting the ECU by disconnecting the battery will also reset the OBDII readiness tests to a "not complete" state, which will cause you to fail the inspection.
Some of the CEL fixes will also keep the readiness tests from completing.
Yup...That's why I put the stock exhaust back on because the MRT always gave me a P0420 Cat Efficiency code. With the stock exhaust, and the codes cleared, I passed with flying colors.

Oh yeah, Cooljo2.5rs.....Double posting is not cool. It's even less cool since you have your own thread on that exact same subject.
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Old 04-28-2004, 07:06 PM   #9
Julian
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Default Re: Back fire

Quote:
Originally posted by Cooljo2.5rs
my 01 impreza 2.5 keeps on back firing each time I up shift and press the gas petal...it happens aroung 2-3000 rpm shifts, sometimes the check engine light comes on (happened already 4 times this past 2 months) when this occurs. My car farts bad..Any solutions?
Say hello to cat damage.
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Old 04-28-2004, 07:54 PM   #10
obyone
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Default

Quote:
Originally posted by Julian
Say hello to cat damage.
Unburnt fuel going to the hot cat = melted core, but it also equals more power (due to less restriction) but a failed emissions test.
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