[snedanator]

2007 335i. Started getting misfire codes when I went to stage 2 MHD. 1st and 2nd gear pulls strong to red line then 3rd pulls decent to about 5k then a bit lame between 5k to 5700 and engine light comes on...limp mode. Just put new plugs n coils yesterday and it's still the same. Misfire cylinder 4. 5. 6. Possibility 3 injectors? Or any other ideas? And misfire at low tank level...29d9.

[GTRZilla]

Does the car start normal and still drives? That's all the codes you have?

[snedanator]

Car starts fine and idles smooth...and runs fine with no stumbles or jerkiness.... only when I floor it in 3rd when it gets to above 5k ish it starts to give up and then the engine light comes on and reduced power. Then after about a minute the light goes off and back to normal. 29d2, 29d1, 29d0, 29d9 = misfire at low tank level, 29cc= misfire at multiply cylinder. :-( Brand new Ngk plugs, perfectly gapped and brand new NGK coils yesterday to see if it would fix the issue but it's still the same codes?

[snedanator]

Is there anything else I can try before getting new injectors?

[BM3Rrrr]

Originally Posted by snedanator

Is there anything else I can try before getting new injectors?

If you flash back to Stage 1 do you still get codes/misfires?

[upshift_downshift]

Try to get a log if you can. See if high or low fuel pressure is dropping. If it's fine, it's most likely the injectors. If not, that points you to the fuel pumps.

[snedanator]

Originally Posted by BM3Rrrr

If you flash back to Stage 1 do you still get codes/misfires?

Yeah I tried that, it was just the same.

[snedanator]

Originally Posted by upshift_downshift

Try to get a log if you can. See if high or low fuel pressure is dropping. If it's fine, it's most likely the injectors. If not, that points you to the fuel pumps.

I'll look at logging. The HPFP was renewed 20k ago. So if it's not injectors it could be the LPFP? Do i log using MHD? Never used the function for logging...lol

[upshift_downshift]

Originally Posted by snedanator

I'll look at logging. The HPFP was renewed 20k ago. So if it's not injectors it could be the LPFP? Do i log using MHD? Never used the function for logging...lol

You need to have the logging module, I think its around $50. There should be a button for "monitor" or something along those lines. With the device plugged in, get to about 3.5k rpm in third gear, start the log, then floor it till redline. Let off and end the log.

Alternatively, you can put it in "auto" mode, and it will start and stop the log automatically.

Then, upload the file it creates to datazap.me

[snedanator]

Originally Posted by upshift_downshift

You need to have the logging module, I think its around $50. There should be a button for "monitor" or something along those lines. With the device plugged in, get to about 3.5k rpm in third gear, start the log, then floor it till redline. Let off and end the log.

Alternatively, you can put it in "auto" mode, and it will start and stop the log automatically.

Then, upload the file it creates to datazap.me

. Much appreciated for the info mate... I'll get on the case and see what happens.

[GEOS07335i]

Go through the MHD thread so you know what to log. Do you have any hesitation what index are your injectors and how many miles on the car.

[Cloverdale]

Misfire codes remedied following the re gapping of the Bosch 3 prong plugs to .022". Symptoms began following install of Jb4, catless downpipes, intercooler, charge pipe, BOV and DCI. Curious what you gapped the NGK's at that you installed? I have NGK's at the ready for my next change and it appears they're gaped larger than .022" which is the gap recommended by many!

[Zarrachan]

Originally Posted by upshift_downshift

Try to get a log if you can. See if high or low fuel pressure is dropping. If it's fine, it's most likely the injectors. If not, that points you to the fuel pumps.

+1

[snedanator]

Right so, I have a lot. It would be much appreciated if someone could have a look at it to see if they can spot any issues. https://datazap.me/u/snedanator/log-1535113819?log=0&data=3-21

[Bimmer_Engineer]

Originally Posted by snedanator

Right so, I have a lot. It would be much appreciated if someone could have a look at it to see if they can spot any issues. https://datazap.me/u/snedanator/log-...og=0&data=3-21

Here's a link to a thread with some info on interpreting MHD logs.

https://www.e90post.com/forums/showt...&highlight=MHD

IDK what's the issue specifically, but the fuel pumps look good...

[tisdrew]

Originally Posted by snedanator

Right so, I have a lot. It would be much appreciated if someone could have a look at it to see if they can spot any issues. https://datazap.me/u/snedanator/log-...og=0&data=3-21

hpfp and lpfp look healthy throughout pull. bank 2 goes super lean at 5600, at least one injector is bad but I'd recommend updating all 6 to index 12.

[snedanator]

So today after I done the log I decided to flash it back to stock and try a log, but on idle started running rough then normal driving the engine light comes on. So I flashed back to stage 2 and done another pull from 3k, started the log and it only got to about 3.6k then engine light again. So I tried it again from 3k and it pulled pretty hard to about 5.3k, then eventually got to about 6.3k then engine light again. Second gear is fine all the way up. It's running rough on idle now and a little stumbly at the start of the revs. Also smelled a bit fuel, it wasn't coming from the engine bay I'm sure, but smelled like unburnt fuel from the exhaust? Also getting new codes on top of the usual misfire cylinder 5,6. 2A2C , 29E1 mixture control 2? I'm no expert but I've been sniffing around the forums and some say it's the injectors, or possible 02 sensor? This is the log that failed about 3.6k https://datazap.me/u/snedanator/log-...og=0&data=3-21 And this is the 3 run log, probably similar to the first initial log https://datazap.me/u/snedanator/log-...og=0&data=3-21

[snedanator]

Originally Posted by tisdrew

hpfp and lpfp look healthy throughout pull. bank 2 goes super lean at 5600, at least one injector is bad but I'd recommend updating all 6 to index 12.

Much appreciated for the look at the logs. If u have a spare few minutes could u look at my last post and the logs please... And yeah I'm starting think it's the injectors myself. Funds permitting I was gonna get 3 asap and do bank 2.... then when I have cash I'll get the other 3 done. I was just wanting to make sure that it was defo the injectors and not something else.

[snedanator]

Originally Posted by Bimmer_Engineer

Here's a link to a thread with some info on interpreting MHD logs.

https://www.e90post.com/forums/showt...&highlight=MHD

IDK what's the issue specifically, but the fuel pumps look good...

Much appreciated for the link, I'd like to learn to see what I'm looking at to save asking people all the time. I'm glad the fuel pumps are ok...the hpfp was renewed 20k ago, so I wasn't sure if the lpfp was on its way out but it seems to be pretty good .

[tisdrew]

Originally Posted by snedanator

Much appreciated for the look at the logs. If u have a spare few minutes could u look at my last post and the logs please... And yeah I'm starting think it's the injectors myself. Funds permitting I was gonna get 3 asap and do bank 2.... then when I have cash I'll get the other 3 done. I was just wanting to make sure that it was defo the injectors and not something else.

When o2s fail, they'll throw specific codes but if they are starting to go out you might get some minor leanness b/c they're not quite calibrated.

Your bank 1 and bank 2 afrs deviate from each other wildly, 99% sure it'd be injectors. You cannot buy just 3 index 12s, you have to do all 6 at once, or so I've been told. You can mix and match under index 10 but index 12's can't mix with others. Unsure about index 11's.

[snedanator]

Originally Posted by GEOS07335i

Go through the MHD thread so you know what to log. Do you have any hesitation what index are your injectors and how many miles on the car.

69k miles. And there are 2 index 5 and 4 index 9, can't remember what cylinders have what tho. They probably need changed no doubt.

[snedanator]

Originally Posted by Cloverdale

Misfire codes remedied following the re gapping of the Bosch 3 prong plugs to .022". Symptoms began following install of Jb4, catless downpipes, intercooler, charge pipe, BOV and DCI. Curious what you gapped the NGK's at that you installed? I have NGK's at the ready for my next change and it appears they're gaped larger than .022" which is the gap recommended by many!

Yeah they are perfectly gapped at .022.... I quadruple checked them 🙂