Emission test
Thread Starter
Drifting
Joined: Jan 2008
Posts: 1,283
Likes: 13
From: Akron Ohio
Emission test
What a joke, so they just plug it in to check for service engine light. I asked them if I installed a cam and did some work to it would it still pass emission test. The guy said as long as it doesnt throw a code. I guess this really isnt an "emission" test huh?
Burning Brakes
Joined: Jun 2007
Posts: 1,043
Likes: 3
From: Roselle IL
Ya, just did mine today in Illinois, same thing, the guy noticed I had a cam, but didnt say anything about not passing.
Plugged in the OBDII reader and that was it, passed
Good thing it passed as a new law went into effect in 08 - if your car does not pass, you can't renew your plates
Plugged in the OBDII reader and that was it, passed
Good thing it passed as a new law went into effect in 08 - if your car does not pass, you can't renew your plates
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
Not true here-the IM monitors have to pass too, not just the MIL lamp. That's why just reseting the Check Engine before the test will guarantee a FAILURE.
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
Before we got it shut-down in practically the whole of Ohio; they had switched to a OBD test only... and stopped using the rollers.
The first thing their ODB test unit did is pull the checksum and compare it to a list of valid ones. This tells whether the cars original PCM programing has been altered or not. Then once that checks ok; it goes on to pull any codes. This is all automatically done.
The druggies working at the E-Check facility haven't a clue as to what's actually being tested, all they know is whether the car passed or failed.
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
If I remember correctly; a simple dyno tune won't change the checksum. All a "simple" dyno tune does is change the WOT fuel tables which are not a part of the emissions system checksum.
but deleting O2's or anything to do with emissions can change it; thus causing you to fail the very first thing checked during the OBDII plug-in.
but deleting O2's or anything to do with emissions can change it; thus causing you to fail the very first thing checked during the OBDII plug-in.
Melting Slicks
Joined: Feb 2006
Posts: 3,191
Likes: 43
From: Scottsdale Az
If I remember correctly; a simple dyno tune won't change the checksum. All a "simple" dyno tune does is change the WOT fuel tables which are not a part of the emissions system checksum.
but deleting O2's or anything to do with emissions can change it; thus causing you to fail the very first thing checked during the OBDII plug-in.
but deleting O2's or anything to do with emissions can change it; thus causing you to fail the very first thing checked during the OBDII plug-in.
Burning Brakes
Joined: Jun 2007
Posts: 1,043
Likes: 3
From: Roselle IL
They plug my car in and it passed easily. I haven't had cats or O2s on it for 3 years now. Not only that, it also smelled like fuel and has that big cam idle along with a nice blower whine. Still passed the OBDII test though. Just find a tuner that knows what they're doing I guess.
I'm cat-less also, and no O2 sensors in the rear - just simulators.
I was kind of nervous about the smell too, as a cat-less car does have a "heavy" fuel smell.
My Speed shop did not put the cats in when I got the long tubes installed so it was not by choice, I would have put them in, if they had asked. I just assumed they would have put them on.
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Le Mans Master
Joined: Nov 2005
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Race Director
Joined: Jan 2006
Posts: 10,554
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From: Not on either liberal coast.
...so what's the complaint? 
If I ever have to go through emissions again, that would be faster than waiting in line for an hour. And I'd much rather have them plug into the port than have one of mutt emissions station employees do a simulated test drive on rollers at a specific speed, plus check the gas cap, plus check the undercarriage with a mirror, plus check under the hood...quit complaining.
If I ever have to go through emissions again, that would be faster than waiting in line for an hour. And I'd much rather have them plug into the port than have one of mutt emissions station employees do a simulated test drive on rollers at a specific speed, plus check the gas cap, plus check the undercarriage with a mirror, plus check under the hood...quit complaining.
