Emssions testing question

[jstreet0204]

After the 35 miles the code should be cleared. Maybe less miles. I drove around for like 2 hours to clear the codes when it was smog day.

To be clear on this, "System Not Ready" code is cleared after the eec has completed the OBDII tests, which is also when the codes will show up if the rear o2's don't detect the cats. So you can't pass by simply disconnecting the battery.

 

[Roger_4.6_96]

To be clear on this, "System Not Ready" code is cleared after the eec has completed the OBDII tests, which is also when the codes will show up if the rear o2's don't detect the cats. So you can't pass by simply disconnecting the battery.

Ya if you say so.

 

[jstreet0204]

Ya if you say so.

Some states will allow the the P1000 code if no more than 2 tests have not been run. If you passed by disconecting the battery, you got lucky and that particular test hadn't run. Once the p1000 code has cleared all test have run. Feel free to look it up in the service manual.

 

[Roger_4.6_96]

Are you not reading what i wrote ? I said once you clear the codes you have to drive the car for 35 miles. once you do that the p1000 code is gone. Its not lucky cause i done it the past 3 years. I even passed smog with no cats or egr without mils or a chip.

 

[jstreet0204]

Are you not reading what i wrote ? I said once you clear the codes you have to drive the car for 35 miles. once you do that the p1000 code is gone. Its not lucky cause i done it the past 3 years. I even passed smog with no cats or egr without mils or a chip.

I read it and I'm saying you are wrong. It has nothing to do with 35 miles.
http://www.obdii.com/drivecycleford.html

You may have gotten lucky and passed where you are, but anyone that chooses to believe the info you are giving out risk not only it costing them the cost of having to retake the inspection, but also risk the fact that they are more likely to do a visual inspection which may cause them to have to put a legal midpipe back on, or possibly face the federal fine that can be impossed for removing the cats in the first place.

Just by a set of Mil eliminators and be done with it.

 

[KXT]

^ I concur, you did just get lucky.

The real question at this point is when a chip/tuner removes the test for the rear o2 does it set a P1000 code?

 

[Mike97gt]

Well, again, it depends how the scanner turns off the check engine light. If it fakes the computer to think that the sensor is reading properly, then yes it will pass. But i would bet that it only dissables the sensor and puts it in a "not ready to read" mode. This will turn off the check engine light, but it will not pass.
Like if you disconnect your battery to clear that code...it goes away for a while because the system is not ready to read, it is still gathering information, but as soon as you drive it long enough, the light comes right back. I THINK MIL elliminators and scanners just put the sensor in a "not ready to read" mode permanently so the light goes away and doesnt annoy you, but doesnt fix the problem. But, i dont know exactly how they do it, i just know how the testing works. Maybe someone should give the company who makes them a call and asks them how they work.

This whole topic has me greatly interested because i didnt take that chance, when I inspected my car i took my H-pipe w/MILs out and put back my stock one. now im almost wishing i had tried it just to see. I dont know how the MIL elliminators or programers that do the same thing work, so i cant answer that question, im just clearing up how the test works, so if anyone knows they can fill in my blank spots and we will hopefully get an answer.

the mil eliminators fool the pcm into thinking the car has 2 properly working rear 02 sensors reading normal readings. so you will pass.

 

[Mike97gt]

^ I concur, you did just get lucky.

The real question at this point is when a chip/tuner removes the test for the rear o2 does it set a P1000 code?

no it does not set the p1000 code.. turning off the rear 02 sensors removes the cat monitors compleatly from the obd2 testing.

 

[Mike97gt]

Ya if you say so.

j street is right.. you can not pass by disconecting the battery.. if your car has a active fault the OBD2 self testing the PCM does too turn off the p1000 will pick up any faults as they happen.. this is why the manufactuers trust the OBD2 on-board diagnositcs too emmisions test cars instead of a dyno..

this is not up too debate if you want i will post it right out of ford OBD2 diagnostics manual for your model year car. they designed the system. .and i have been working with it for years and i am 100 percent sure that a car with a active fault ( like no cats with working rear monitors ) the PCM will not clear the p1000 untill all the on board tests have passed. and in this example the car would not pass the cat monitor tests.

 

[Mike97gt]

No clearing your codes by removing the battery will not pass because the reason the codes are gone is because you erased them, but the tests are still running in the computer, and when it gets to that sensor, the check engine light will come back on, until then that test will show up as "not ready to read"

But like jstreet pointed out, the scanners erase that test from the computer all together, so that the test on that sensor no longer exists. There is no sensor to get a reading now because the test is gone and the will be no code. A completely different way than MILs, but works none the less.

try this, unplug an oxygen sensor or an EGR line and take a drive....the Check engine light will come on. you can disconnect the battery and it will go away, butif you dont fix it, it will come back again in a few miles. And until id does come back, the computer reads "system not ready to read" so it will always know when something is wrong, unless you make it think its right (MILs) or just erase that check alltogether with a tuner, but it wont pass by dissconnecting the battery.

this is correct

They can shut it off. But you can shut it off to by disconnecting the battery. once the codes are cleared you need to drive around for 35 miles. It will pass smog as long as the codes havent popped up in those 35 miles.

this too is CORRECT if your lucky enough that the problem causing the check engine light too come on does not happen in the time it takes too pass all monitors. . then you need too be lucky enough too make it too the testing station before the problem comes back..

 

[AirWolf87]

Are you not reading what i wrote ? I said once you clear the codes you have to drive the car for 35 miles. once you do that the p1000 code is gone. Its not lucky cause i done it the past 3 years. I even passed smog with no cats or egr without mils or a chip.

you are COMPLETELY WRONG. After driving the car for 35 miles, the code will come right back.

this too is CORRECT if your lucky enough that the problem causing the check engine light too come on does not happen in the time it takes too pass all monitors. . then you need too be lucky enough too make it too the testing station before the problem comes back..

If you get inspected in those 35 miles before the light comes back, the sensor will read "system not ready to read" and you will be required to drive the car until the sensor comes back online (at the end of those 35 miles) but the code will come back ad you will fail.

 

[jstreet0204]

no it does not set the p1000 code.. turning off the rear 02 sensors removes the cat monitors compleatly from the obd2 testing.

Ahh the answer to the million dollar question. Thanks Mike!

 

[Roger_4.6_96]

Even if you had obd2 code puller. You cant just clear the codes and get a smog. You will still fail.

Disconnect the battery or clear with programmer you will still fail smog if you tryed right away.

 

[Mike97gt]

Ahh the answer to the million dollar question. Thanks Mike!

no problem.. this works the same for cars with EGR removed.. by turning it off with a programmer you remove the test from the OBD2 cycle. so with a removed EGR the only way you can fail if you have it turned off is if they dyno the car. then you will have high NOX and fail.

 

[Mike97gt]

you are COMPLETELY WRONG. After driving the car for 35 miles, the code will come right back.

If you get inspected in those 35 miles before the light comes back, the sensor will read "system not ready to read" and you will be required to drive the car until the sensor comes back online (at the end of those 35 miles) but the code will come back ad you will fail.

i know that air wolf.. i don't think i made myself clear.

what i was saying is. that he is somewhat right. IF now IF is big here. IF the problem is interminint and it don't act up during a full obd2 drive cycle then the p1000 will be gone.

BUT if it acts up between the time the code was cleared and the obd testing is not done yet then the code will reset.

if you try and test it before the monitors are done then you will fail for the p1000

now what i mean is the only way what roger said could work is if the computer don't pick up the fault right away and it passes the obd2 tests.. and not only does it have too pass all tests but the problem can't reoccur before you make it toot he testing station.

 

[AirWolf87]

ok i see what you are saying now. but like you said, thats a pretty big IF. For what its worth, get MIL elliminators and be done with it.

........and can someone make this thread a sticky??? I know everyone with OBD inspections has thought about this.

 

[flexiclese]

NY inspection

correct me if i'm wrong but the southern NY counties (eg. Westchester and Putnam as well as NYC) and jersey do dyno sniffers in the tail pipe don't they? So even if you correct the computer code you'll still fail based on tail pipe emissions won't you? I've been gettin Inspections in Westchester county for many years and they've always given me my emmisions levels read out when gettin inspected, although I have never actually watched a vehicle go through an ispection.

 

[97GTSTANG]

Does anyone know when the OBD II emissions testing will start in Va? Currently they use the dyno and sniffer

 

[01MineralgreyGT]

use the mil eliminator it should do the trick I work for dmv and have seen a car pass with them on.

 

[Mike97gt]

ok i see what you are saying now. but like you said, thats a pretty big IF. For what its worth, get MIL elliminators and be done with it.

........and can someone make this thread a sticky??? I know everyone with OBD inspections has thought about this.

yeah i agree with you.. get the mil elims and be done with it. he must have a fault that is real intermintint that is setting off the light in his car.