[Saif2018]

Originally Posted by El-daybed

I also noticed that my stft are also way off untill the car warms up bad o2 senosrs? Replaced the valve cover 2 days ago

I would say that's the next thing to check /replace.

[El-daybed]

Originally Posted by Saif2018

I would say that's the next thing to check /replace.

Ive been thinking it was the 02 sensors , is it common for them to go bad and is there any way i can check with mhd or do i need inpa

[tej98]

Originally Posted by El-daybed

Ive been thinking it was the 02 sensors , is it common for them to go bad and is there any way i can check with mhd or do i need inpa

You'll need to check voltages with INPA. Although I'm fairly certain they will throw a code when they go bad if the voltage swings out of range. I've been dealing with a similar misfire as soon as the car uses readings from the oxygen sensors, I'll feel a few misfires (no codes).

These injectors fail by leaking down, but can also be partially clogged and just not flow properly. I've also checked for leaking injectors, but mine are fine. I am contemplating swapping the upstream oxygen sensors from bank 1 to bank 2 and see if the issue moves (my STFT on bank 1 are very high), or swapping one injector at a time from bank 1 to 2.

[Bimmer_Bro]

Originally Posted by tej98

You'll need to check voltages with INPA. Although I'm fairly certain they will throw a code when they go bad if the voltage swings out of range. I've been dealing with a similar misfire as soon as the car uses readings from the oxygen sensors, I'll feel a few misfires (no codes).

These injectors fail by leaking down, but can also be partially clogged and just not flow properly. I've also checked for leaking injectors, but mine are fine. I am contemplating swapping the upstream oxygen sensors from bank 1 to bank 2 and see if the issue moves (my STFT on bank 1 are very high), or swapping one injector at a time from bank 1 to 2.

If you are going to go to the trouble of removing them, you might as well just replace them. They do wear out and become less accurate without throwing codes. Just my two cents

[El-daybed]

Originally Posted by tej98

You'll need to check voltages with INPA. Although I'm fairly certain they will throw a code when they go bad if the voltage swings out of range. I've been dealing with a similar misfire as soon as the car uses readings from the oxygen sensors, I'll feel a few misfires (no codes).

These injectors fail by leaking down, but can also be partially clogged and just not flow properly. I've also checked for leaking injectors, but mine are fine. I am contemplating swapping the upstream oxygen sensors from bank 1 to bank 2 and see if the issue moves (my STFT on bank 1 are very high), or swapping one injector at a time from bank 1 to 2.

If you do this please let me know if it fixes you issue!! I have ordered all 4 new 02 sensors so i guess well see if anything changes when they get here i have a feeling it is them because i can see when they turn on on mhd and as soon as it starts reading off of the afr’s is when it starts to mis fire ,i have gotten catalytic conversion2 codes would that maybe be it?

[Saif2018]

Originally Posted by El-daybed

Ive been thinking it was the 02 sensors , is it common for them to go bad and is there any way i can check with mhd or do i need inpa

You'll need to use INPA, as tej98 suggested, MHD doesn't show O2 voltages as far as I'm aware.

[studio54]

Originally Posted by tej98

You'll need to check voltages with INPA. Although I'm fairly certain they will throw a code when they go bad if the voltage swings out of range. I've been dealing with a similar misfire as soon as the car uses readings from the oxygen sensors, I'll feel a few misfires (no codes).

These injectors fail by leaking down, but can also be partially clogged and just not flow properly. I've also checked for leaking injectors, but mine are fine. I am contemplating swapping the upstream oxygen sensors from bank 1 to bank 2 and see if the issue moves (my STFT on bank 1 are very high), or swapping one injector at a time from bank 1 to 2.

Does these misfire with no code happens only at idle ?
Cause I always got those kind of little random shakes at idle, even with brand new OEM Bosch (not from BMW dealer), and after intake valves cleaned.
Interesting reading :
https://www.e90post.com/forums/showthread.php?t=1653112
https://www.e90post.com/forums/showp...9&postcount=43

To resume, it says that original BMW bosch aren't exactly the same as aftermarket OEM bosch, the person got these small shakes with brand new Bosch, and reinstalled back old original BMW and shakes were gone... it's still 3 prongs but it has a minimal gap difference (maybe a factory defect). Most solved with installing NGK gapped at 0.022.

My theory is maybe, in open loop, first minutes, O2 sensors are ignored, it runs smoother maybe because of fueling difference (I imagine open loop runs richer so it ignites better). As soon as the DME switch to closed loop, those kind of little shake happens once or twice per minute.

Originally Posted by Bimmer_Bro

If you are going to go to the trouble of removing them, you might as well just replace them. They do wear out and become less accurate without throwing codes. Just my two cents

Maybe for troubleshooting only (like to determine if errors follow bank 1 or 2), it's probably possible to reset lambda value and swap upstream O2 sensors connectors/plugs in the engine bay without the hassle of swapping them on downpipes. I believe rear o2 sensors have different plug, but for upstream, it's same plugs if I remember well.

[shinobi_1]

Here’s another data log. Any problem areas?
https://datazap.me/u/jadda7480/log-1...og=0&data=3-20

[Bimmer_Bro]

Originally Posted by shinobi_1

Here’s another data log. Any problem areas?
https://datazap.me/u/jadda7480/log-1...&data=3-20

Which map is this?!
Looks pretty good, stays on boost target and wgdc looks normal.
One thing is your low pressure fuel pump might be starting to get a little tired. Generally you want it to stay above 60psi during the pull. Yours does dip into the 50s in a few places. If it dips into the 40s you will need to replace.

[shinobi_1]

Originally Posted by Bimmer_Bro

Which map is this?!
Looks pretty good, stays on boost target and wgdc looks normal.
One thing is your low pressure fuel pump might be starting to get a little tired. Generally you want it to stay above 60psi during the pull. Yours does dip into the 50s in a few places. If it dips into the 40s you will need to replace.

It’s a brand new stage 2 bucketless fuel pump. I did forget to turn off traction control. I’ll have to do another run and see if that makes a difference

[Bimmer_Bro]

Originally Posted by shinobi_1

It’s a brand new stage 2 bucketless fuel pump. I did forget to turn off traction control. I’ll have to do another run and see if that makes a difference

That makes sense. What map is this or is it custom?

[El-daybed]

Originally Posted by tej98

You'll need to check voltages with INPA. Although I'm fairly certain they will throw a code when they go bad if the voltage swings out of range. I've been dealing with a similar misfire as soon as the car uses readings from the oxygen sensors, I'll feel a few misfires (no codes).

These injectors fail by leaking down, but can also be partially clogged and just not flow properly. I've also checked for leaking injectors, but mine are fine. I am contemplating swapping the upstream oxygen sensors from bank 1 to bank 2 and see if the issue moves (my STFT on bank 1 are very high), or swapping one injector at a time from bank 1 to 2.

Definitley something going on with pre-cat 02 voltage will go from 0.003 to about 0.40 when warm maybe heater in 02 sensors but seems unlikely both would go at same time i will replace and see what happens thank you for your reply much appreciated i will kep you updated

[El-daybed]

Originally Posted by Bimmer_Bro

If you are going to go to the trouble of removing them, you might as well just replace them. They do wear out and become less accurate without throwing codes. Just my two cents

Thank you for the reply and help with diagnosis, definitely seems to be something going on with precat 02 sensors will replace and let you know what happens

[El-daybed]

Originally Posted by Saif2018

You'll need to use INPA, as tej98 suggested, MHD doesn't show O2 voltages as far as I'm aware.

Thank you for the reply and help with diagnosis, definitely seems to be something going on with precat 02 sensors will replace and let you know what happens

[Saif2018]

Originally Posted by El-daybed

Thank you for the reply and help with diagnosis, definitely seems to be something going on with precat 02 sensors will replace and let you know what happens

No worries mate, Hope it solves the problem.

[colman]

Ran V10 2+ FBO +inlets (N54). Looks like some major timing corrections? Anything else? Corrections aren't consistent across cylinders it appears.

Using the 93 tune with Shell gas. N55 plugs stock gap (1 step colder for N54)

pull 1 (worst timing corrections)

https://datazap.me/u/criemersma1/wag...7-8-9-10-20-24

pull 2

https://datazap.me/u/criemersma1/wag...og=0&data=3-20

pull 3

https://datazap.me/u/criemersma1/wag...7-8-9-10-20-24

Tempted to try getting a custom tune to make use of the inlets.

[Saif2018]

Originally Posted by colman

Ran V10 2+ FBO +inlets (N54). Looks like some major timing corrections? Anything else? Corrections aren't consistent across cylinders it appears.

Using the 93 tune with Shell gas. N55 plugs stock gap (1 step colder for N54)

pull 1 (worst timing corrections)

https://datazap.me/u/criemersma1/wag...7-8-9-10-20-24

pull 2

https://datazap.me/u/criemersma1/wag...og=0&data=3-20

pull 3

https://datazap.me/u/criemersma1/wag...7-8-9-10-20-24

Tempted to try getting a custom tune to make use of the inlets.

That was some pretty bad timing corrections, ouch!

Pull 3 is a lot better though,

Have you changed Coils recently?

What about your injectors?

Also your Shell fuel Could be crap, unless you're using something like Shell V power,

[colman]

Actually, I just noticed a throttle closure that relates to the timing correction. It appears I am over boosting a bit at peak boost. I assume this is related to the inlets not being accounted for. May be custom tune time

[Saif2018]

Originally Posted by colman

Actually, I just noticed a throttle closure that relates to the timing correction. It appears I am over boosting a bit at peak boost. I assume this is related to the inlets not being accounted for. May be custom tune time

The timing corrections on Pull 3 are minor, but you can get better performance from a custom tune, some get overboosting with inlets others don't on OTS maps.

The significant difference between OTS and custom maps on stock turbos is top end power, it will hold boost higher up, typically upto around 16psi.

On hindsight I have a custom tune on stock turbos, the difference between stage 2+ and a custom map is minor, wouldn't bother with custom tunes on stock turbos.

[Kryptek49]

Hi all, recently swapped the motor in my n54 after the old one blew up. I've installed downpipes and an upgraded FMIC + mapped to Stage 2+.

After a week or two of no issues, an engine light popped up for 2C32: Lambda control 2.

I've had a look at my AFR's, and they seem a bit out of whack when coming off the accelerator pedal.

See attached log: https://datazap.me/u/kryptek49/stage...zoom=1857-2273

I've come up to about 3,600 rpm, then lot of the gas, I've read AFR should should up to about 230 immediately, but you can see their that the bank 2 takes ages to hit 235, and bank 1 only gets up to 186?

Here's my short commute home from work: https://datazap.me/u/kryptek49/lambd...zoom=1638-1920

Bank 1 always seems behind bank 2. Does this mean I've definitely got leaky injectors? Or is there something else to look at?

Bank 1 are all Index 7's, bank 2 are all Index 12's.

Thank you!

[Saif2018]

Originally Posted by Kryptek49

Hi all, recently swapped the motor in my n54 after the old one blew up. I've installed downpipes and an upgraded FMIC + mapped to Stage 2+.

After a week or two of no issues, an engine light popped up for 2C32: Lambda control 2.

I've had a look at my AFR's, and they seem a bit out of whack when coming off the accelerator pedal.

See attached log: https://datazap.me/u/kryptek49/stage...zoom=1857-2273

I've come up to about 3,600 rpm, then lot of the gas, I've read AFR should should up to about 230 immediately, but you can see their that the bank 2 takes ages to hit 235, and bank 1 only gets up to 186?

Here's my short commute home from work: https://datazap.me/u/kryptek49/lambd...zoom=1638-1920

Bank 1 always seems behind bank 2. Does this mean I've definitely got leaky injectors? Or is there something else to look at?

Bank 1 are all Index 7's, bank 2 are all Index 12's.

Thank you!

Injectors possibly leaking in Bank 1. You could pull the plugs and see if they are wet or smell of fuel, could also pull the injectors and have a look.

[clopez976]

Hello can you please take a look at my logs seems im not close to bost target ? I Would really apprecaite it thanks !


https://datazap.me/u/carlos-lopez/lo...og=0&data=3-27


2009 BMW 335I LCI Sedan

5'VRSF FMIC
DP's
New index 12 injectors
New LPFP
Oem Turbos on 160k mILES (Currently waiting to install new purchsed turbos)
new water pump
Transmisison rebuild a few monts ago
dual cone intakes
step 1 colder plugs
new valve cover gasket
upgraded pcv valve & catch can
ingintion colis a few monts ago when i installed plugs not even 5k miles yet.
I