MHD Ecu unlock, software only!

[solidsleeper]

Originally Posted by bassrebel

Correct me if I'm wrong (and I probably am!) but, wouldn't that just affect the way it charges the battery? Would it also affect how it distributes the electricity through the car?

I just changed the ah of the battery from 80ah AGM to 80ah. Anything else I need to do?

If you wanted to be extra OCD and cautious, I'd take the battery to autozone/pep boys/oreillys to test the battery health. If you want to skip getting the battery tested, maybe just go on a moderate drive for 30-40 minutes and then start to apply more and more throttle until you build up to WOT and hopefully misfire free as you incrementally apply more throttle. I'm no electrical or ECU/DME guru, so don't know how AGM vs non-AGM would affect the cars electrical distribution, but I've just read on the BMW forums not having the correct battery coding could result in some wacky electrical issues and specifically misfire issues as well. And the coils are operated by electricity and sends an electrical ignition to your plugs so if you're not getting the proper voltage under high load at WOT, maybe it could be your issue. If this doesn't solve your issues, I'd have to say you have to try swapping the cylinder 4/5 coils with 1/2 cylinders to see if it's a coil issue, and also check the 4/5 cylinder spark plugs to see if those have abnormal wear like wheela suggested, and also get the battery tested if you skipped that part.

[bassrebel]

Originally Posted by solidsleeper

If you wanted to be extra OCD and cautious, I'd take the battery to autozone/pep boys/oreillys to test the battery health. If you want to skip getting the battery tested, maybe just go on a moderate drive for 30-40 minutes and then start to apply more and more throttle until you build up to WOT and hopefully misfire free as you incrementally apply more throttle. I'm no electrical or ECU/DME guru, so don't know how AGM vs non-AGM would affect the cars electrical distribution, but I've just read on the BMW forums not having the correct battery coding could result in some wacky electrical issues and specifically misfire issues as well. And the coils are operated by electricity and sends an electrical ignition to your plugs so if you're not getting the proper voltage under high load at WOT, maybe it could be your issue. If this doesn't solve your issues, I'd have to say you have to try swapping the cylinder 4/5 coils with 1/2 cylinders to see if it's a coil issue, and also check the 4/5 cylinder spark plugs to see if those have abnormal wear like wheela suggested, and also get the battery tested if you skipped that part.

I'm gonna take her to a nice drive to NYC today (about 200 miles round trip). Hopefully things will get better! 😜

[darkrom]

Originally Posted by solidsleeper

From what I see on both Bimmerlink and Protools apps, I believe this is true. I also reached out to MHD about it and they were not sure and didn't express any confidence about if this was true or not.

What are you seeing to believe this. I have BimmerLink and just checked and my battery was still coded to 70ah and I swap between e30 and 93 fairly often.

Side note it showed my battery at 88% charge, is that normal? I just got it this winter after my factory one smoked and leaked in my trunk 🤮

[solidsleeper]

Originally Posted by darkrom

What are you seeing to believe this. I have BimmerLink and just checked and my battery was still coded to 70ah and I swap between e30 and 93 fairly often.

Side note it showed my battery at 88% charge, is that normal? I just got it this winter after my factory one smoked and leaked in my trunk ��

I haven't really played around with BimmerLink's battery function in a while, but are you saying there is a way to check the current battery rating coding in Bimmerlink? I was going off the assumption that the battery registration coding gets reset when you flash MHD because after flashing an MHD tune the mileage record of the last battery registration would disappear (of course I could be wrong, but MHD wasn't able to confirm and maybe if you had INPA/ISTA you'd be able to check the rating).

Whenever I check my battery % charge in Bimmerlink, it usually shows somewhere between 70-80% and I changed my battery with an aftermarket Interstate AGM w/ same 80Ah rating as the original battery (replaced battery 2020 January).

Edit: checked BimmerLink and it does show the battery Ah/AGM rating. so I guess I'm wrong about the coding being reset based on what darkrom experienced

[solidsleeper]

screenshot of BimmerLink app showing my battery type

[darkrom]

It could be a long flash vs short flash possibly. I'm just happy it stayed 70 amp or I'd have been over charging it.

[bassrebel]

Something interesting I just saw on this log...

Is says oxygen sensor incomplete... could that point to a possible O2 sensor fault?

[bassrebel]

More updates... on BimmerLink I can see which cylinder is misfiring... looks like 4 is the culprit (36) and 5 (6)... if I have some time today I'll swap them with 1&2 and see what's up

[bassrebel]

Originally Posted by bassrebel

More updates... on BimmerLink I can see which cylinder is misfiring... looks like 4 is the culprit (36) and 5 (6)... if I have some time today I'll swap them with 1&2 and see what's up

https://datazap.me/u/bassrebel/log-1...=0-1-2-3-4-5-6

[wheela]

Originally Posted by bassrebel

More updates... on BimmerLink I can see which cylinder is misfiring... looks like 4 is the culprit (36) and 5 (6)... if I have some time today I'll swap them with 1&2 and see what's up

Curious if you got to try this yet? I just saw over on e90 post a guy was having misfires on 1 and switched coils between 1 and 2. He noticed the coil felt looser on 1, and after switching coils the misfires went away (presumably a loose coil connection). But he also had a code for short spark duration.

[bassrebel]

Originally Posted by wheela

Curious if you got to try this yet? I just saw over on e90 post a guy was having misfires on 1 and switched coils between 1 and 2. He noticed the coil felt looser on 1, and after switching coils the misfires went away (presumably a loose coil connection). But he also had a code for short spark duration.

I haven't felt a need to use the truck yet so I haven't done it lol I did switch the tune to stage 2 91oct and nothing changed... maybe I'll do it this afternoon

[bassrebel]

So I changed coil 4 with coil 1 and I'm still getting the same stuttering in cyl 4&5. Do I have to reset adaptations?

[solidsleeper]

Originally Posted by bassrebel

So I changed coil 4 with coil 1 and I'm still getting the same stuttering in cyl 4&5. Do I have to reset adaptations?

So I'm assuming you had a shop replace your spark plugs for you? Did they also replace your coils or did you do the coils yourself? Since it wasn't too long ago since the shop replaced them, I feel like most reputable independent shops would take a look/warranty the parts for free if you're having issues so soon.

Praying for you my man lol. If you're still gonna try to solve it yourself, I would also check coil 5 and swap that with coil 2.

Also while you're there, I would check spark plugs 4 & 5 since you're already there. I understand you might not have the plug socket/extension/tools though... and kinda sucks to get to cylinder 5 as well.

[bassrebel]

Originally Posted by solidsleeper

So I'm assuming you had a shop replace your spark plugs for you? Did they also replace your coils or did you do the coils yourself? Since it wasn't too long ago since the shop replaced them, I feel like most reputable independent shops would take a look/warranty the parts for free if you're having issues so soon.

Praying for you my man lol. If you're still gonna try to solve it yourself, I would also check coil 5 and swap that with coil 2.

Also while you're there, I would check spark plugs 4 & 5 since you're already there. I understand you might not have the plug socket/extension/tools though... and kinda sucks to get to cylinder 5 as well.

My shop is an hr away from me... I just bought the thin wall spark plug socket and tomorrow will be changing the spark plugs to see if it makes any difference

[bassrebel]

Originally Posted by bassrebel

My shop is an hr away from me... I just bought the thin wall spark plug socket and tomorrow will be changing the spark plugs to see if it makes any difference

There is light at the end of the tunnel!!! In this resurrection Sunday my truck gave resurrection signs!!! I switched the plugs from 4&5 to 1&2 and the misfires followed the plugs sooo there's the culprit! 2 Brand new spark plugs failed! I'll stop by the auto store tomorrow and pick up 2 new ones and we should be done!!

[solidsleeper]

Originally Posted by bassrebel

There is light at the end of the tunnel!!! In this resurrection Sunday my truck gave resurrection signs!!! I switched the plugs from 4&5 to 1&2 and the misfires followed the plugs sooo there's the culprit! 2 Brand new spark plugs failed! I'll stop by the auto store tomorrow and pick up 2 new ones and we should be done!!

THERE IS A GOD!!! Happy Easter Sunday to you bassrebel

[wheela]

Originally Posted by bassrebel

There is light at the end of the tunnel!!! In this resurrection Sunday my truck gave resurrection signs!!! I switched the plugs from 4&5 to 1&2 and the misfires followed the plugs sooo there's the culprit! 2 Brand new spark plugs failed! I'll stop by the auto store tomorrow and pick up 2 new ones and we should be done!!

Sweet nectar!!! Glad you got it sorted!

[wheela]

It will be interesting to see if you can see anything wrong with those 2 bad plugs once you pull them out.

[bassrebel]

Originally Posted by wheela

It will be interesting to see if you can see anything wrong with those 2 bad plugs once you pull them out.

No more hesitation! All is well now! =]

Thank you and @solidsleeper for all the help!

Here's a pic of the spark plugs... these were put on in December

[Bolhaboy]

Anybody else with MHD run into 2BC0 Fuel-air mixture too lean codes, looking for some fix ideas

[bassrebel]

Originally Posted by Bolhaboy

Anybody else with MHD run into 2BC0 Fuel-air mixture too lean codes, looking for some fix ideas

Would you share with us more info?

What mods do you have? What stage are you running it? Is it causing any errors?

[Bolhaboy]

Originally Posted by bassrebel

Would you share with us more info?

What mods do you have? What stage are you running it? Is it causing any errors?

VRSF FMIC, VRSF Chargepipe, AFE Drop in Intake, XHP Stage 2, MHD 1+, H&R/ Bilstein combo. Nothing too crazy as far as mods go, I also did plugs recently but not coils and took it to my shop but they said they couldn't diagnose it as I cleared the code they had nothing to go off of. I ordered the Fuel-It stage 1 LPFP upgrade, new oxygen sensor, and new high pressure fuel sensor just to be precautionary.