[sovende96]

Originally Posted by vereak82

My serpentine belt just let go on the highway and tore up my front crank seal also after wrapping around the crank pulley... Oil everywhere son of ahhhh!

Same thing happened here a few weeks ago... The crank seal is a b**ch to fix. Much harder than just replacing the belt. My old seal was torn to shreds... Good luck!

[psmitty95]

Originally Posted by E90Company

I told him it's either bad front O2's or damaged ringland/cracked pistons. Told him to get a compression test too. He hasn't listened and was dead set on it being carbon buildup when I told him it wasn't. I was right

It being carbon buildup wasn't my idea and I was definitely not dead set on it being that... Also I tried getting a compression test but shop didn't have enough time. Next time it's there it will be tested. Really doubt its something internal though because I think in that case the car would be fucked on stock mapping and map 2. Car felt perfectly fine on stock mapping last week. If it's o2's it's definitely not front o2's... Only codes i've gotten are for rear o2's and while at Autocouture they were reading the o2's and only 1 was acting strange as I said earlier and that was one of the rears.

Originally Posted by ZTZ1010

+1. could be e85 related, no? like a lean spike that damaged a piston? maybe get a compression test

I hope not. Compression test is the plan next time it's in the shop

Originally Posted by joec500

I would try straight 93 to remove that variable.

I once i'm on empty. I'm sure it will still hesitate probably just not throw codes like it is on map 2

Originally Posted by vereak82

My serpentine belt just let go on the highway and tore up my front crank seal also after wrapping around the crank pulley... Oil everywhere son of ahhhh!

Damn that sucks

[Lifted07Duramax]

So have you tried removing the tuner completely and seen if it still happens?

[psmitty95]

Originally Posted by Lifted07Duramax

So have you tried removing the tuner completely and seen if it still happens?

Yea I had it with JB4 out last week and no misfires as far as I could tell. I expected that though, stock boost is not much at all so I didn't expect the car to misfire

[E90Company]

Originally Posted by psmitty95

It being carbon buildup wasn't my idea and I was definitely not dead set on it being that... Also I tried getting a compression test but shop didn't have enough time. Next time it's there it will be tested. Really doubt its something internal though because I think in that case the car would be fucked on stock mapping and map 2. Car felt perfectly fine on stock mapping last week. If it's o2's it's definitely not front o2's... Only codes i've gotten are for rear o2's and while at Autocouture they were reading the o2's and only 1 was acting strange as I said earlier and that was one of the rears.

That's the code you posted a few pages back in regards to the O2 sensors. This is the PRE-CAT Lambda O2, along with "trimm control" meaning your DME is altering your AFR. Remember fueling on the N54 is closed loop.

What makes you think it's a post-cat code? It isn't. And don't doubt something internally is wrong, it's very possible looking at your log you posted with AFR's lean spiking in the 16-17 ranges at WOT. Get a compression test as soon as you can to rule it out at the minimum.

[psmitty95]

Originally Posted by E90Company

That's the code you posted a few pages back in regards to the O2 sensors. This is the PRE-CAT Lambda O2, along with "trimm control" meaning your DME is altering AFR ratios, to account for something out of the norm. Remember fueling on the N54 is closed loop.

What makes you think it's a post-cat code? It isn't. And don't doubt something internally is wrong, it's very possible looking at your log you posted with AFR's lean spiking in the 16-17 ranges at WOT. get a compression test as soon as you can to rule it out.

I thought it was post-cat since the code says "Behind Catalytic Converter"

[E90Company]

Originally Posted by psmitty95

I thought it was post-cat since the code says "Behind Catalytic Converter"

"Behind Catalytic Converter" is your lambda(AFR) front O2 sensor. If it said "After Catalytic Converter" that would be your rear O2's. It doesn't even make sense reading it to yourself, if "after" were your lambda O2's.

[psmitty95]

Originally Posted by E90Company

"Behind Catalytic Converter" is your lambda(AFR) front O2 sensor. If it said "After Catalytic Converter" that would be your rear O2's. It doesn't even make sense reading it to yourself, if "after" were your lambda O2's.

Are you sure? After googling the code some guy had a bunch of cat codes and one read "Lambda probe in front of catalytic converter" then he had the codes I have "behind catalytic converter". Terry also said it was codes for my rears...

Here's the link:

http://www.1addicts.com/forums/showthread.php?t=236969

[E90Company]

Originally Posted by psmitty95

Are you sure? After googling the code some guy had a bunch of cat codes and one read "Lambda probe in front of catalytic converter" then he had the codes I have "behind catalytic converter". Terry also said it was codes for my rears...

Here's the link:

http://www.1addicts.com/forums/showthread.php?t=236969

You originally said your codes were from having catless downpipes. How could this be the case when the code is only in one bank? "Downpipe codes" are 29F4 and 29F5 respective to the banks.

To adress the above, read that thread. It states exactly what I just told you.

[psmitty95]

Originally Posted by E90Company

You originally said your codes were from having catless downpipes. How could this be the case when the code is only in one bank? "Downpipe codes" are 29F4 and 29F5 respective to the banks.

To adress the above, read that thread. It states exactly what I just told you.

29F4 and 29F5 are the codes I got in the first picture and why I said they were from having catless downpipes. As stated in the OP I assumed the trimm control and system check was normal too until Terry mentioned it. I read that thread and it didn't state anything other than what the codes are which I know. Terry told me they were post cat codes which would make sense. Why would BMW have codes that say "Behind Catalytic Converter" be in front, and then codes that say "In front of catalytic converter" be behind..? Just doesn't make sense to me but maybe i'm missing something

[E90Company]

Originally Posted by psmitty95

29F4 and 29F5 are the codes I got in the first picture and why I said they were from having catless downpipes. As stated in the OP I assumed the trimm control and system check was normal too until Terry mentioned it. I read that thread and it didn't state anything other than what the codes are which I know. Terry told me they were post cat codes which would make sense. Why would BMW have codes that say "Behind Catalytic Converter" be in front, and then codes that say "In front of catalytic converter" be behind..? Just doesn't make sense to me but maybe i'm missing something

You are referring to the code descriptions maybe?? It dousn't say "In front of," it says "After." That's what you are missing, big difference. What's after the cat? The post-cat O2.

[psmitty95]

Originally Posted by E90Company

You are referring to the code descriptions maybe?? It dousn't say "In front of," it says "After." That's what you are missing, big difference. What's after the cat? The post-cat O2.

My code says "Behind Catalytic converter 2" and one of the codes in that thread I linked says "In front of catalytic converter 2." Yes that is referring to the code description. I would assume that if the code says behind, it is after the cat and if it says in front of, it is before the cat. Could be wrong though

Edit: Just double checked with Terry and he said that my code (2C7F) is the rear o2

[E90Company]

Originally Posted by psmitty95

My code says "Behind Catalytic converter 2" and one of the codes in that thread I linked says "In front of catalytic converter 2." Yes that is referring to the code description. I would assume that if the code says behind, it is after the cat and if it says in front of, it is before the cat. Could be wrong though

Edit: Just double checked with Terry and he said that my code (2C7F) is the rear o2

I could be wrong. It would just make sense to me the way it's worded. I don't have any personal experience dealing with O2's so go with what Terry says.

[JETBLK335i]

Clean and switch your vanos.

[Szemenyei]

Have you reset your adaptations yet after the carbon cleaning? After that if it still misfires I would like others have said drop it down to straight 93 and see what happens.

[psmitty95]

Originally Posted by JETBLK335i

Clean and switch your vanos.

I'm planning on having Bryce do that next time i'm up there

Originally Posted by Szemenyei

Have you reset your adaptations yet after the carbon cleaning? After that if it still misfires I would like others have said drop it down to straight 93 and see what happens.

Nope. I told Autocouture to do it but the main tech there said he doesn't think it's a good idea since he doesn't want to make the car anymore confused than it is already.




Update from today. Ran map 2 all day and then tried hard to get it to misfire on map 2 and succeeded. Code was P0305 misfire cylinder 5


Edit: What doesn't make sense to me is that i'm getting cyl 5. If it's one of the 3 usual suspects (coils, plugs, or injectors) then it must be coils, right? I did the cyl 5 injector a few weeks ago then did spark plugs last week. Anyone think I should try doing all 6 coils next since they're the cheapest? I swapped cyl 5 coil pack to cyl 2 before doing plugs and I don't think i've gotten a cyl 2 misfire...

[marv85]

Originally Posted by psmitty95

I'm planning on having Bryce do that next time i'm up there



Nope. I told Autocouture to do it but the main tech there said he doesn't think it's a good idea since he doesn't want to make the car anymore confused than it is already.




Update from today. Ran map 2 all day and then tried hard to get it to misfire on map 2 and succeeded. Code was P0305 misfire cylinder 5


Edit: What doesn't make sense to me is that i'm getting cyl 5. If it's one of the 3 usual suspects (coils, plugs, or injectors) then it must be coils, right? I did the cyl 5 injector a few weeks ago then did spark plugs last week. Anyone think I should try doing all 6 coils next since they're the cheapest? I swapped cyl 5 coil pack to cyl 2 before doing plugs and I don't think i've gotten a cyl 2 misfire...

It's been going on for a while, so help me refresh my mind on this.

1) Injectors replaced? decoupling element included? correct coding?

2)plugs replaced?

3) coils replaced?

[joec500]

Originally Posted by psmitty95

I'm planning on having Bryce do that next time i'm up there



Nope. I told Autocouture to do it but the main tech there said he doesn't think it's a good idea since he doesn't want to make the car anymore confused than it is already.




Update from today. Ran map 2 all day and then tried hard to get it to misfire on map 2 and succeeded. Code was P0305 misfire cylinder 5


Edit: What doesn't make sense to me is that i'm getting cyl 5. If it's one of the 3 usual suspects (coils, plugs, or injectors) then it must be coils, right? I did the cyl 5 injector a few weeks ago then did spark plugs last week. Anyone think I should try doing all 6 coils next since they're the cheapest? I swapped cyl 5 coil pack to cyl 2 before doing plugs and I don't think i've gotten a cyl 2 misfire...

Try swapping a plug to just make sure?

This is weird...I doubt it's coilpack, if you swapped it and the misfired didn't return. I had a similar situation when my coilpack failed, I replaced the coilpack, and the misfire did not occur all the time, but kept having the cycle 5 misfire, so I decided to just replace one plug and the misfires have yet to return.

Perhaps when a coilpack fails or starts to fail it takes out the plug? Again, all of this is a shot in the dark.

[psmitty95]

Originally Posted by joec500

Try swapping a plug to just make sure?

This is weird...I doubt it's coilpack, if you swapped it and the misfired didn't return. I had a similar situation when my coilpack failed, I replaced the coilpack, and the misfire did not occur all the time, but kept having the cycle 5 misfire, so I decided to just replace one plug and the misfires have yet to return.

Perhaps when a coilpack fails or starts to fail it takes out the plug? Again, all of this is a shot in the dark.

Well I did plugs about two weeks ago with NGK 5992's... And yes I did gap them down to .022

Originally Posted by marv85

It's been going on for a while, so help me refresh my mind on this.

1) Injectors replaced? decoupling element included? correct coding?

2)plugs replaced?

3) coils replaced?

Cylinder 3 injector replaced last summer due to misfires then cylinder 5 injector replaced less than a month ago. Both were replaced with decoupling element and both were coded by @Szemenyei

Plugs I replaced about two weeks ago with NGK 5992 and gapped them down to .022

Coils have not been replaced but before I did plugs I swapped them around a bit. Swapped cyl 5 to cyl 2 and cyl 4 to cyl 3.

[135Pats]

Coils, VANOS solenoids, or o2 sensor shenanigans? I had a pre-cat o2 go bad on me last fall, and the car was misfiring and running generally poorly. It sounds like your motor is seriously cranky over something, hope you can get this fixed up without blowing a hole in your wallet OP.

[JETBLK335i]

Originally Posted by psmitty95

Well I did plugs about two weeks ago with NGK 5992's... And yes I did gap them down to .022

Cylinder 3 injector replaced last summer due to misfires then cylinder 5 injector replaced less than a month ago. Both were replaced with decoupling element and both were coded by @Szemenyei

Plugs I replaced about two weeks ago with NGK 5992 and gapped them down to .022

Coils have not been replaced but before I did plugs I swapped them around a bit. Swapped cyl 5 to cyl 2 and cyl 4 to cyl 3.

Pete. Ill bet you a wash that it's your solenoids or ignition coils.

Let me know if that solves it.

If not you got a wash on
Me. Hope you get it resolved soon.

[psmitty95]

Originally Posted by 135Pats

Coils, VANOS solenoids, or o2 sensor shenanigans? I had a pre-cat o2 go bad on me last fall, and the car was misfiring and running generally poorly. It sounds like your motor is seriously cranky over something, hope you can get this fixed up without blowing a hole in your wallet OP.

Me too but it's looking like I might just have to keep throwing parts at it

Originally Posted by JETBLK335i

Pete. Ill bet you a wash that it's your solenoids or ignition coils.

Let me know if that solves it.

If not you got a wash on
Me. Hope you get it resolved soon.

Haha sounds like a deal