Why do I keep getting rejected for emission testing.

[Diavolo]

I've been trying to pass emissions for the last few months and every time I go, I get rejected. It isn't failing any tests, but some of the tests aren't ready. Catalytic Covnerter Eff, Heated Oxygen Sensor, and EGR Flow are all 'Not Ready'. Every thing else was fine and the there are no codes being thrown. I drove 35 miles (from the burbs to the city) and pulled into the emissions testing place right off the highway.

Anyone have any suggestions?

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[Fish]

Are those codes turned off in your PCM? I thought I was told that you can only have so many "not ready"s before that is a cause of failure as well.

 

[mr.gto]

I've been trying to pass emissions for the last few months and every time I go, I get rejected. It isn't failing any tests, but some of the tests aren't ready. Catalytic Covnerter Eff, Heated Oxygen Sensor, and EGR Flow are all 'Not Ready'. Every thing else was fine and the there are no codes being thrown. I drove 35 miles (from the burbs to the city) and pulled into the emissions testing place right off the highway.

Anyone have any suggestions?

codes and the readyness monitors take time to reset. They also have specific drive cycles and times that have to be completed. I know my cat readyness monitor wont throw a code for about 5 or 6 drive cycles depending on how far I drive. usually u have to be crusing on the highway or so for it to run. And it has to fail twice before it will set a code or pass once before it will say ready. Hope this helps

 

[Diavolo]

I keep getting SES P300 codes(multiple misfires) I reset them before I get to the emissions place. I haven't tracked down why I get them but I was under the impression that as long as it is cleared (My DTC's show none on the emissions report) that I would be fine. Is it because I keep reseting my light, that it is causing other systems to never "be ready"?

 

[Eagle]

Yep, it'll take your PCM 50-100mi. to get everything in "passed" status again.

 

[02BlueGT]

Is it because I keep reseting my light, that it is causing other systems to never "be ready"?

YES! anytime you clear codes, it resets the readiness monitors, thats how they make sure you don't just clear the codes and drive in.

 

[Diavolo]

YES! anytime you clear codes, it resets the readiness monitors, thats how they make sure you don't just clear the codes and drive in.

OOooooooooo. I figured it would only be applied to THAT specific code. I'm just going to remove the multiple misfire code for now and get my emissions done.

Is there anyway to tell system readiness using Powrtuner so I don't need to keep going to get emissions testing and getting rejected?

 

[epik_x]

Why not just find out whats causing the misfire and fix it?

 

[DanJ]

I'm fairly certain with the cam in his car, it needs to be tuned just right as too not throw that code. Most people just set it to non reporting but that can be a problem if your car actually does start to random misfire from something else. I did the same time last time i tested and cleared the P0420 code while sitting in the lanes waiting.

 

[TommyGloves]

If you know someone with LS1M it does emissions readiness scanning. I have one if you want to make a trip out to Palatine later in the week. (The PT does not do the monitors.)

Also, in the PT, make sure the codes you want to modify are set to 3-No Reporting in the DTC Fault Type section. Leave the settings in the DTC Fault Enabled section alone.

EDIT: Just rememebered that a Tech II or SnapOn scantool can also check the monitors.

 

[02BlueGT]

HPtuners also shows emissions status in the scanner

 

[Outlaw]

you can have the codes taken out with HP tuners... i'm not exactly sure what they do but that's what I did after my second air pump crapped out and I didnt want to spend the money to have it fixed... again...

 

[Diavolo]

I am going to fix the misfires ASAP. My plates have expired but I can't get new tags until I pass emissions so I need to pass tomorrow before my temp tags expire. I replaced the plugs recently, I will check the wires tomorrow.

 

[bikrboy128]

the s1x cam will throw the misfire code. delete it in PT along with any other codes you have and drive. if you want you can swing by and we can check the readiness monitors before you take the test.

 

[Diavolo]

So I just looked through my BIN and I have no codes disabled at all. I've passed emissions 3 or 4 times with out having a cat converter installed. hmmmm

 

[Diavolo]

Rejected again

 

[Fish]

If you have no codes disabled at all, that could be why you are getting your multiple misfires since you are cammed.

What is the sheet saying?

 

[cacicgtp7]

Rejected again

Are you sure you'll be able to delete my P0141 code lol, sounds like some bad luck over there

 

[Diavolo]

No DTC codes are being thrown. Catalytic Converter Eff, EGR Flow, and Heated Oxygen Sensor are Not Ready. I drove my car 20 min before I got there. I did disable the multiple misfire code a few days ago and I drove up and down the highway some. I've driven around the city a little too. I wonder since driving around the city means mostly stop and go only up to 30 mph, that I am not completing any "driving cycles".

If you have no codes disabled at all, that could be why you are getting your multiple misfires since you are cammed.

What is the sheet saying?

 

[Diavolo]

Are you sure you'll be able to delete my P0141 code lol, sounds like some bad luck over there

I can

 

[Alacran]

Oh my goodness. The drive cycle for each one is listed on the web. IIRC the drive cycle for the Cat and O2 is generally cold startup, warm up, and then drive on the highway at constant speed. Then for the EGR you let of the pedal and let the car caost for a while until speed is down by half or 30mph depenfing on how fst you are going. Either way you have to get on the highway.

 

[SilentShado]

Yep, it'll take your PCM 50-100mi. to get everything in "passed" status again.

Negative, two years in a row I have passed emmisions resetting my computer pulling the cable, drive it for one day then go to emissions. I then get it tested it passes and within a day the CEL comes back on. 1st time was EGR flow, and just recently I had misfire on one cylinder. I passed and on the way home bam CEL turns on with you guessed it misfire.

 

[Eagle]

READINESS MONITORS
An essential part of the OBD II system are the "readiness monitors". These are self-tests the OBD II system runs to make sure everything is functioning normally. When a test runs and pases without any faults, the OBD II system runs the next monitor and the next until all have completed. This may take some time because some monitors require specific driving conditions before they will run. Also, if a fault is found during any test, it may prevent subsequent monitors from completing.

The misfire detection, fuel system and continuous system monitors are active and ready all the time, but the non-continuous monitors require a certain series of operating conditions before they will set - and you cannot do a plug-in OBD II test unless all of the monitors are ready.

To set the converter monitor, for example, the vehicle may have to be driven a certain distance at a variety of different speeds. The requirements for the various monitors can vary considerably from one vehicle manufacturer to another, so there is no "universal" drive cycle that will guarantee all the monitors will be set and ready.

As a general rule, doing some stop-and-go driving around town at speeds up to about 30 mph followed by five to seven minutes of 55 mph plus highway speed driving will usually set most or all of the monitors (the converter and EVAP system readiness monitors are the hardest ones to set). So if you are checking the OBD II system and find a particular monitor is not ready, it may be necessary to test drive the vehicle to set all the monitors.

The Environmental Protection Agency (EPA) realized this shortcoming in current generation

OBD II systems. So, when it created the rules for states that want to implement OBD II testing in place of tailpipe dyno testing, it allows up to two readiness flags to not be set prior to taking an OBD II test on 1996 to 2000 vehicles, and one readiness flag not to be set on 2001 and newer vehicles.

Another good bit of info:
http://www.cleanairforce.com/docs/readiness.pdf

You got lucky basically

 

[Kbrown]

Yep, it'll take your PCM 50-100mi. to get everything in "passed" status again.

not so true, if you find your cars drive cycle and run that about 3 times in a row they will flip,

I had the same problem with my GTP and that had to be done before it would flip over....

here is GM's cycle just so you have it: http://www.obdii.com/drivecycle.html

i did this about 3 times and they flipped.

 

[Eagle]

It was more of an estimate guys. Unless you follow the drive cycle instructions to the T, it's likely you'll be driving a decent distance before all the readiness codes go green.