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      10-13-2017, 10:08 PM   #1
monterey
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smog test

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today i went in for a smog and it said the cat wasn't ready. i read that i must drive it for 15 mins between 20 to 30 and 15 mins between 40 to 60. any rpm over 3k or 60 mph erases the data and must start over. is this true?
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      10-13-2017, 10:16 PM   #2
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It needs to be driven up to operating temperature potentially a few times. Best thing is to have a scanner that reads obd rediness and just drive it a few times and check the status. There is no set amount of miles etc until the car passed the cat test.
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      10-13-2017, 10:17 PM   #3
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Quote:
Originally Posted by monterey View Post
today i went in for a smog and it said the cat wasn't ready. i read that i must drive it for 15 mins between 20 to 30 and 15 mins between 40 to 60. any rpm over 3k or 60 mph erases the data and must start over. is this true?
This is for GM, and each manufacturer is slightly different, but you get the idea:
http://www.obdii.com/drivecycle.html


Basically, you need to vary speed and duration for a while. Driving at WOT or very aggressively will not set readiness.
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      10-13-2017, 10:51 PM   #4
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which scanner will i need?
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      10-13-2017, 11:30 PM   #5
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Quote:
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which scanner will i need?
Order a Schwaben scanner from ECS tuning. The things you can do with that scanner to avoid a shop are astonishing!!!
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      10-14-2017, 12:00 AM   #6
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Quote:
Originally Posted by monterey View Post
today i went in for a smog and it said the cat wasn't ready. i read that i must drive it for 15 mins between 20 to 30 and 15 mins between 40 to 60. any rpm over 3k or 60 mph erases the data and must start over. is this true?
I had that issue before, on my '05 M3. It was frustrating trying to get the code to clear (based on what the smog mechanic had told me...) until I had the specific info on how to do so and followed it to the letter.

You are pretty close regarding the details, at least for the latter part (I didn't have any need to do what you described re: 20-30mph for 15 mins). Once you've gotten the car warmed up, get on the freeway at a time when you are sure not to hit any traffic because you need to keep a pretty steady speed and avoid getting into the throttle. Cruise in the slow lane, limit yourself to around 57mph. The magic number is 60mph -- if you touch 60, the test will reset and you're back to square one. Keep in mind the speed the ECU reads may not be 100% accurate to your speedo, that's why I recommend a max mph that's a few mph short. Stay light on the throttle, and don't change gears. On the E46 M3 it takes roughly 10-12 minutes for the code to clear, YMMV.

Be prepared to throw your emegency blinkers on to get tailgaters off your tail

You absolutely should have an OBD2 scanner to be able to monitor when the Catalyst Ready state has been triggered. You do not need anything special in this regard -- you can order a Bluetooth dongle off Amazon for about $25 that will pair with your smartphone and then you can use a free OBD-reading app to monitor your smog readiness flags in real-time. Every car enthusiast should have one of these, they are handy for more than just smog. They typically work across all cars you own, and can read (and clear, if needed) any error codes a car generates as well as reading a variety of sensor values.

Good luck!
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      10-14-2017, 12:05 AM   #7
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Are you on a stock xpipe? Tuned? If so, talk to him/her.

If it's an option, just have them put it on the sniffer and avoid the pia of trying to complete the drive cycle for readiness.
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      10-14-2017, 12:31 AM   #8
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Quote:
Originally Posted by M43S7RO View Post
Are you on a stock xpipe? Tuned? If so, talk to him/her.

If it's an option, just have them put it on the sniffer and avoid the pia of trying to complete the drive cycle for readiness.
They eliminated the sniffer test in CA for OBD2 (1996 and newer) cars. The smog test here is a visual inspection plus an OBD2-based test where you essentially can't have error codes, or smog-related monitoring tests that aren't in a Ready state.
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      10-14-2017, 11:12 AM   #9
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i have the Carly blutooth will this tell me if its ready? This guy wanted to flunk me so bad he kept searching and searching but my car is bone stock lol.
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      10-14-2017, 11:42 AM   #10
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Quote:
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i have the Carly blutooth will this tell me if its ready? This guy wanted to flunk me so bad he kept searching and searching but my car is bone stock lol.
It's in "OBD Functions" if I remember correctly.
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      10-14-2017, 02:51 PM   #11
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I had to do my smog this past August, and had to do the drive cycle to pass.

Do exactly this! http://europeantransmissions.com/Bul...0Procedure.pdf and you will be ok.
Attempt it late at night on the freeway. The cold air speeds the process as well as less traffic to do the cycle.
I was able to complete it during the first hour.
Once you do? Make sure to have the engine running for over 30mins before going in again for the smog! (the engine has to be hot so that the readings are more accurate.)

Like what the others say. Get a scanner!
I?m using the ?Xtool? which is what my SA uses. But there are others that are way better and do allot more.
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      10-14-2017, 03:21 PM   #12
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      10-14-2017, 08:36 PM   #13
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holy moly i tried going under 60 mph its nearly impossible on the freeway. i wasted the whole day trying and got no luck.
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      10-14-2017, 08:54 PM   #14
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Quote:
Originally Posted by monterey View Post
holy moly i tried going under 60 mph its nearly impossible on the freeway. i wasted the whole day trying and got no luck.
Do you know which readiness monitor is not ready? You might not need the freeway portion.
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      10-14-2017, 10:51 PM   #15
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does anyone know what the nox thing is on carly?
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      10-14-2017, 10:52 PM   #16
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Quote:
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i have the Carly blutooth will this tell me if its ready? This guy wanted to flunk me so bad he kept searching and searching but my car is bone stock lol.
Yes it will, OBDII section. I used it to be sure I would pass.
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      10-14-2017, 11:30 PM   #17
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once it all clears can i turn the car off or will it start all over again?
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