Ok The new battery is installed and I’m going to register it using ISTA. It’s a 95 amp hour battery, I had a 95 hour battery in there already. But the original OEM battery was 90. I don’t think it matters that much to register as a 90. If I have to program it I’ll have to take it to the dealer or get ISTA P which is like 80 GB.

We’ll see how it goes

Sadly the new battery didn’t correct the issue. At least I have a new battery though so for the sake of preventative maintenance that’s done.

At this rate I should just replace my valve Tronic motor for the heck of it lol

Did you get the battery registered to the car?

I wasn't overly hopeful on the battery and wouldn't have recommended it except you said your batt was 5+ years old. That's about the usable life span of a battery in a modern BMW from my experience.

@ 250k I guess the valve tronic could be getting sluggish, but with the codes you have it wouldn't be my first salvo in the parts cannon.

It’s all good man you gave me the inspiration I needed to replace it anyway. It was going to go bad at some point who knows maybe even this winter.

After the full system reset, and resetting all of the modules, that O2 sensor code came back as pending. There’s definitely something going on there I need to go look at the O2 sensor tomorrow. I read that a bad O2 sensor could cause shuttering and shaking during acceleration. I hope that’s what’s up!

Hey, thanks for the comment! Yeah, I used ISTA to register the battery. Took about two minutes to get it done!

Can you read out the current LTFTs and STFTs? What out about lambda outputs?

Hi thanks for the reply! Can you tell me what LTFT and STFT is please? I can do that this morning!

Thanks!

Long and short term fuel trim and also ignition adaptation values.

I'm not sure if this is exactly what you're looking for but I took pictures of ISTA before and after a 15 minute drive. This is from overnight cold to running temperature where the shudder starts. So far I still do not have a CEL but that O2 sensor code is pending. I could buy a brand new Bosch O2 sensor for $150 if that is an issue.

If there's a different data set you're looking for I'll grab it just tell me where to find it and I'll get it on here ASAP!


O2 and Adaptations Before
https://xoutpost.com/attachment.php?...1&d=1638985175
https://xoutpost.com/attachment.php?...1&d=1638985175


O2 and Adaptations After
https://xoutpost.com/attachment.php?...1&d=1638985175
https://xoutpost.com/attachment.php?...1&d=1638985175


Engine Values Before
https://xoutpost.com/attachment.php?...1&d=1638985304


Engine Values After
https://xoutpost.com/attachment.php?...1&d=1638985304


Smooth Running Operation Before
https://xoutpost.com/attachment.php?...1&d=1638985304


Smooth Running Operation After
https://xoutpost.com/attachment.php?...1&d=1638985304


Vanos Before
https://xoutpost.com/attachment.php?...1&d=1638985304


Vanos After
https://xoutpost.com/attachment.php?...1&d=1638985304


Eccentric Operation Before
https://xoutpost.com/attachment.php?...1&d=1638985304


Eccentric Operation After
https://xoutpost.com/attachment.php?...1&d=1638985304