Engine Cycle Suggestions - Emissions Rejected

[gaiakai]

I tried numerous drive cycles w/o success. I was running out of time so was looking at all options. I tried a product called "Cataclean". I wasn't expecting it to work but after pouring it in with a 1/4 tank of gas left and a short drive, my CAT monitor set itself to OK. Took the car in and it passed smog w/o issue. So relieved.

My car has 79k so I was confident i wasn't having an issue with actual catalytic converter.

I know this is a necro (sorry) but I wanted to thank you for this. After multiple drive cycles at 3am my stubborn CAT monitor only set to 'ready' after the cataclean. I was about to pay $200 for a smog repair shop to go through the drive cycle themselves on their own dyno to make it ready. $200 is a lot of chicken nuggets, so again, thank you! 141k stock M3 for reference.

[Tbonem3]

I also believe EGT was removed or ignored by smog computers several years ago.

[martin.oconnor]

Evap is not needed to pass in CA, just fyi.

https://www.bar.ca.gov/Industry/OBD_...ence#readiness

Ah - I thought it was all of them in CA. Good to know. (Now just need to sort the secondary air, which has not reset despite multiple cold starts. I've had some related pending codes in the recent past so might need a new secondary air pump.)

[heinzboehmer]

In CA, all modules have to be in the ready state to pass.

Evap is not needed to pass in CA, just fyi.

https://www.bar.ca.gov/Industry/OBD_Test_Reference#readiness

[martin.oconnor]

SAP will only go ready on a cold start. EVAP had to be less than 3/4 tank to go ready.

I wes able to pass in MD without EVAP going ready.

Yup - my tank was 100% full so the preconditions for that test were not met.

In CA, all modules have to be in the ready state to pass.

[eacmen]

I used this approach a few days ago and it succeeded in getting my catalyst and heated-catalyst tests into readiness.

(Driving at 55mph in the slow lane was a revelation. There appears to be a large class of people who actually do it full time.)

Still having issues with evaporation and secondary air tests, but that is another story.

SAP will only go ready on a cold start. EVAP had to be less than 3/4 tank to go ready.

I wes able to pass in MD without EVAP going ready.

[martin.oconnor]

I used this. It worked. Done and drove right to the emissions stations and success. Choose the right "not crowded" road that you don't have to brake, speed up to merge or otherwise fall outside the limits.

....

I used this approach a few days ago and it succeeded in getting my catalyst and heated-catalyst tests into readiness.

(Driving at 55mph in the slow lane was a revelation. There appears to be a large class of people who actually do it full time.)

Still having issues with evaporation and secondary air tests, but that is another story.

[marksae]

What does catalyst have to do with pre cat o2s?

From what I've read, the ECU compares the reading differences between the pre-cat and post-cat o2 sensors to determine the cat efficiency.

[Tbonem3]

What does catalyst have to do with pre cat o2s?

[marksae]

I was able to get my car to pass the catalyst readiness monitor with euro headers. I changed out my front o2 sensors. I cruised on the freeway using cruise control at 60 mph for about 10 minutes. I had the OBD2 reader plugged in and just checked it while I was driving.

[heinzboehmer]

Trying to get my drive cycle done, but have been having issues. Checked the monitors status with torque and obd fusion and both show that none of my monitor are available.



I have a DME that was originally a non-HP that I converted into an HP. I tried with a completely stock 2501 binary and with one that I modified to remove the 151 DTC. Same results with both. I've probably druven the car 150 mi since the last flash.

Anyone know what could be could be going on?

[Nate047]

Had to go through this myself recently. I had to drive 55 on the freeway and even at 2am I felt like I was gonna die the whole time lol. Do what Estoril posted, and regarding the O2 sensors, see if you can get passed without changing them. If you do the cycle correct and the cat monitors are still not ready, swap those O2 sensors out.

[Estoril]

Based on my morning experience at the Emissions Station - I'm going to get the chance to give this a go again. I got a "Not Ready" on my track car. It hasn't been driven at all in the past 3 weeks. Not sure how long not driven but no codes triggers this.

[sdmcoupe]

I tried numerous drive cycles w/o success. I was running out of time so was looking at all options. I tried a product called "Cataclean". I wasn't expecting it to work but after pouring it in with a 1/4 tank of gas left and a short drive, my CAT monitor set itself to OK. Took the car in and it passed smog w/o issue. So relieved.

My car has 79k so I was confident i wasn't having an issue with actual catalytic converter.

[eacmen]

So… My lithium battery died overnight after i left the key in by accident. Lost all my monitors.

Very frustrating!