It's a Walker O2, same sensor as front I think

Funny, I am still having insane AFR issues even with all new O2's...and I am also running Cobb's new tunes. Ever since I did the firmware update, my AFR's are all over the place!

I tested vacuum, same problems. Replaced O2's, same problems. My idle AFR's are too lean and my car runs like hell and I don't understand. There's something wrong with the new Cobb stuff I think.

 

wow, no!

Are you running 382 wtq on stock rods?

 

I just started getting similar problems yesterday. Dealer attempted to reflash for service campaign SC-13-004 without my permission. They couldn't do it though, they got error messages, due to my AMS tune already being on there. I have reflashed since to try and override any problems the dealer may have caused. I'm not sure it's the tune now.

Idle bounces from 600 to 1,300 when I put the clutch in and coast. It looks like the AFRs go rich until it hits 1,300 then fuel cuts out and AFRs go to 18+ until the rpms drop to 600, rinse and repeat. Sometimes the idle will hang around 1,100 or 1,000 as well.

At WOT AFR's go to 12, whereas they used to hit 11.6. My car is also overboosting. Tuned for 24.5psi but it's hitting 27+ now. As far as I know this only started happening AFTER I got the car back from the dealer.

I'm going to try and redownload and flash to the AMS tune again tonight. I checked the fpr hose and it's fine. I already replaced the relay with the blue one. I still have no idea what is causing the issue. I hope it's not the O2. It is the front O2 that measures for closed loop operation correct? I have a stock downpipe so I have never touched the front O2.

 

Well my tuner retuned the car. It is running alot better, but I am worried it will start running bad again as that has been its previous behavior. I would get the car back from the tuners, they would reset the trims, the car would run great and a month later start running sluggish.

But right now, the car runs pretty smooth. It isn't jerky when I switch gears. It hasn't been leaning out at a stop. The AFR's have been solid (except during idle bounce). But we'll see how it is in a month.

But the idle bounce is still there. And it happens as frequent as ever. So I am still lost. It's protuned but done using the cobb ap

Ya, 382 tq on E85. Is that bad?

My AFR's do the same when the idle starts bouncing. It looks like this:

 

I'm having the same issue right now. Leans out to 17 and --- when cold but is then fine afterwards. It wasn't until I changed my injectors that it started acting up. Tom from tscomp is in the middle of tuning it right now and suggested that my O2 sensor could be going out or I have a clogged FIC 1050 injector.

I'm going to swap sensors and I'll post back with update. Also stock rods are good up to 400wtq.

 

Please let me know the results. What is the part number for the front O2 sensor?

 

yeah 382 wtq is pretty hardcore on stock rods, most top out at 370

are you guys all running Cobb AP's? I gave up on it after I got my 2013. Every new firmware upgrade was some new disaster, tunes quit working, I mean it was a massive nightmare. I was impossible for it to tune right, and yeah, it seemed like it would "lose" the tune over time. Whatever they are doing, it's wrong, and ultimately I could not afford to deal with the headache anymore.

 

You are open source now? Did your problems go away?

I am protuned with the Cobb AP and am starting to think that is the issue. But what doesn't make sense is why are other local guys tuned by the same shop via the AP and not having any of these issues?

 

My tuner has said that the AP can cause some weird issues with X's, but it is hard to imagine it would be causing all your problems. Too strange. I hope you get it figured out soon!

 

Here is an updated video to my idle bounce issue (amongst others). I recorded my rpm's on my 20 minute drive to work. In those 20 minutes, I had idle bounce occur during 19 different occasions and for a total of 51 bounces. Pretty much every time I cut power to the car via putting in the clutch or switching to neutral.

Idle bounce occurs at the following times: 1:02, 4:13, 4:37, 5:35, 5:59, 6:02, 6:43, 7:51, 11:32, 12:10, 14:43, 15:29, 15:54, 16:52, 17:39, 18:20, 19:08, 20:18, and 20:40.

 

Any update on this one?

 

Yep

It was my protune. I finally said F it and decided to get retuned from a different tuner. Part of this decision was because my original tuner decided to cease communication and ignore me. But anyways, the new tune fixed all of my issues. And I had a lot of issues. I am still impressed with how smooth my new tune is. And none of these issues have arisen since I was retuned:


Hard to see but the car would run richer than 10.0 during WOT: https://www.youtube.com/watch?v=NgyyAnJOE6s


This is a long boring video, but it shows this ridiculous idle bounces that I would always get everytime I let off the gas and put in the clutch: https://www.youtube.com/watch?v=IW6sEm4T6nY


More idle bounce (short videos):

https://www.youtube.com/watch?v=O1Gp4LTAVkw
https://www.youtube.com/watch?v=w-Anvg_5-to


It would idle bounce and then hang in high rpms:
https://www.youtube.com/watch?v=dDpSWXxRfhU


AFR's would do this during idle bounce:
https://www.youtube.com/watch?v=9m-OpxPRxSs


Was running dangerously lean during WOT:
https://www.youtube.com/watch?v=Fqmm3s4anE8


Car would lean out when coming to a stop:
https://www.youtube.com/watch?v=VMr6sDWqNAU


This is the day after I was first tuned. Cruising at 40mph: https://www.youtube.com/watch?v=KAV78QqltAM


AFR's would move pretty drastically during idle:
https://www.youtube.com/watch?v=4MlAVym5bNk


^^And that was just some of the issues I was having with that tune

 

Call me crazy, but have you tried changing the MAF?

 

As I said, the fix to my issues (and there was more than what I show in the videos) was the tune.

But prior to getting retuned, I:
-Checked the FPR hose
-Changed the fuel pump relay
-Had the injectors flow tested
-Had the fuel pump flow tested
-Checked for exhaust leaks
-Performed a boost leak
-Checked the fuel pressure
-Bought and changed out a new Maf sensor
-Switched fuels from E85 to 93

I'm sure there were a few more tests I am forgetting at this time. I did all of these tests because that tuner swore up and down that it was not the tune that was causing the issues. And my dumb self listened to him.

 

Roger that, good to hear you got it sorted.