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      04-22-2019, 06:01 AM   #1
minky27
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Misfire when using E85 blend

Hi everyone, name is Irwin and I'm new to the forum and the BMW world. I have a 335i E92 that I'm having a hard time deciphering on what is going on. When I use 91 gas (California) and go WOT, I have no problem, but recently I tried playing with E85 blend using the E30 mix coupled with MHD E30 map. Idle and cruising is fine but when I go WOT, the car misfires on cylinder 5, ONLY, around 3500 RPM or so. I could not get a full log because it'll misfires before going redline. I figured my LPFP was going out since I noticed that'll it'll dip to 45psi when I go WOT.

So I bought a stage 2 upgrade (bucket) from EuroTuningGroup and installed it and filled up with an E50 mix and flashed an E50 map from MHD. Drove the car for about 20 miles and it seems fine, idle and regular cruising no problem and LPFP stays above 70. Now I decided to go WOT and I wont even go pass 3000RPM before getting the cylinder 5 misifre AGAIN and a lot earlier compared to E30 mix.

Is this a problem with the mix? I swapped the coils and spark plug (both have less than 5k miles) when I was having problem with E30 mix but the misfire stayed with cylinder 5. The injectors are brand new as well, revision 12s.

I'll be swapping out coils, spark plugs and possibly injectors for this E50 mix and see if I find anything but I'm guessing it'll be the same result as my E30 problem...

Any ideas?

Mods are:

Injen Intake, charge pipe upgrade with Tial, PSP 900 IC, new Valve Cover and gasket and running MHD Stage 1+ map.

Last edited by minky27; 04-22-2019 at 06:04 AM.. Reason: Added more info.
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      04-22-2019, 09:08 AM   #2
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How many miles? Has it been walnut blasted?
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      04-22-2019, 10:07 AM   #3
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I doubt the e85mix itself is causing it. You are putting more load on the motor with the e85 maps so that's causing the misfire. Its just like when people blame the tune but its actually the weak links of the car getting exposed.

cylinder 5 gets the most carbon build up but someone correct me if I am wrong. I would get the valves blasted, regardless it would be a good move. Hopefully that will fix it.
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      04-22-2019, 01:53 PM   #4
minky27
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Quote:
Originally Posted by type-dRew View Post
How many miles? Has it been walnut blasted?
54000 miles and walut blast was done about 5000 miles ago.


Quote:
Originally Posted by 924er View Post
I doubt the e85mix itself is causing it. You are putting more load on the motor with the e85 maps so that's causing the misfire. Its just like when people blame the tune but its actually the weak links of the car getting exposed.

cylinder 5 gets the most carbon build up but someone correct me if I am wrong. I would get the valves blasted, regardless it would be a good move. Hopefully that will fix it.
Could the carbon build up cause it? Its just weird since regular 91 gas doesn't give me a problem no matter how many times I got WOT... Besides carbon build up, what else can cause it?
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      04-22-2019, 02:57 PM   #5
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Show us a log, even an incomplete one.
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      04-22-2019, 03:25 PM   #6
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If your lpfs is reading in the 40's when you WOT then you need to run a lesser ethanol blend or get an upgraded lpfp
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      04-22-2019, 04:01 PM   #7
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Quote:
Originally Posted by IllSic_Design View Post
If your lpfs is reading in the 40's when you WOT then you need to run a lesser ethanol blend or get an upgraded lpfp
oh now its in the 40s? I thought 50s is considered low
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      04-22-2019, 04:05 PM   #8
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Quote:
Originally Posted by 924er View Post
oh now its in the 40s? I thought 50s is considered low
i believe if it stays below 50psi constantly then its BAD.. if it dips for a split second its not that bad... i ran mine for 2 years, stock pump, E40, occasional dip below 50 psi and i never had any issues.

2007 E92 335i / VRSF 5" FMIC-Charge Pipe-DCI-Inlets/ TurboSmart Plumb Back DV / XHP / E50 Custom Tune by WedgePerformance / APEX ARC8 / MT ET Street / 11.71 @ 119 / Instagram.com/silent11n54
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      04-22-2019, 04:06 PM   #9
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Quote:
Originally Posted by shanker604 View Post
i believe if it stays below 50psi constantly then its BAD.. if it dips for a split second its not that bad... i ran mine for 2 years, stock pump, E40, occasional dip below 50 psi and i never had any issues.

2007 E92 335i / VRSF 5" FMIC-Charge Pipe-DCI-Inlets/ TurboSmart Plumb Back DV / XHP / E50 Custom Tune by WedgePerformance / APEX ARC8 / MT ET Street / 11.71 @ 119 / Instagram.com/silent11n54

That's good to know, well then maybe ill start running e85 again cuz my LPFP is dipping only for a second then goes up. I miss e85 lol
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      04-22-2019, 09:58 PM   #10
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Quote:
Originally Posted by tisdrew View Post
Show us a log, even an incomplete one.
Ill attach the link in a little bit.


Quote:
Originally Posted by IllSic_Design View Post
If your lpfs is reading in the 40's when you WOT then you need to run a lesser ethanol blend or get an upgraded lpfp
Just upgraded my LPFP to Stage 2 Bucket from EuroTuningGroup. The lowest it got was 65 PSI and constantly hovering around 75 - 85 PSI.
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      04-22-2019, 10:46 PM   #11
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Here's the logs:

(Misfire occurred)
https://datazap.me/u/irwintan27/log-...og=0&data=3-21

(Log after misfire on idle)
https://datazap.me/u/irwintan27/log-...og=1&data=3-21
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      04-24-2019, 11:56 AM   #12
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Thanks for the log. Perhaps a minor thing, the log name says stage 1+ but also e50. This is just checking basics, you're running the ethanol map when filled with e50, right? I don't mean this as an affront.

HPFP appears to be crashing @ 10psi/2700rpm leaving the fuel rail empty. Bank 1 goes lean and bank 2 is pegged while rich (stft2: -33) -- perhaps a leaky injector. My gut tells me it's HPFP because the issue is only present when running e50 and older/worn units are known to struggle with the volume and present the low rail pressure we're seeing.

It's unusual that bank 1 is the lean one as it's fed first -- potentially something simple but check that your o2 sensors aren't mixed up (bank 2 plugged into bank 1).

The discrepancy between AFRs on bank 1 and 2 make me think it is not a HPFP issue but if that hasn't been replaced recently and the o2 sensors/wiring are all good then HPFP could be the culprit. LPFP looks like a champ now.

Is there a reason you never matted the accelerator pedal? It shows max 51% -- fwiw throttle up @ 81.
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      04-24-2019, 10:29 PM   #13
minky27
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Quote:
Originally Posted by tisdrew View Post
Thanks for the log. Perhaps a minor thing, the log name says stage 1+ but also e50. This is just checking basics, you're running the ethanol map when filled with e50, right? I don't mean this as an affront.

HPFP appears to be crashing @ 10psi/2700rpm leaving the fuel rail empty. Bank 1 goes lean and bank 2 is pegged while rich (stft2: -33) -- perhaps a leaky injector. My gut tells me it's HPFP because the issue is only present when running e50 and older/worn units are known to struggle with the volume and present the low rail pressure we're seeing.

It's unusual that bank 1 is the lean one as it's fed first -- potentially something simple but check that your o2 sensors aren't mixed up (bank 2 plugged into bank 1).

The discrepancy between AFRs on bank 1 and 2 make me think it is not a HPFP issue but if that hasn't been replaced recently and the o2 sensors/wiring are all good then HPFP could be the culprit. LPFP looks like a champ now.

Is there a reason you never matted the accelerator pedal? It shows max 51% -- fwiw throttle up @ 81.

-With MHD V8 Beta Maps, every stage has its own E30 and E50 mix, i.e. Stage 1 E50 mix and Stage 1+ E50 mix. And yes I'm running the Stage 1+ E50 mix.

-I think if I remember correctly even with just the Pump 91 tune, every time I let go of the accelerator, bank 2 will stay rich for a sec or two while bank 1 is already going lean because of fuel cut off (deceleration). Thought this was normal, not sure.

-As far as o2 sensors, I'm still catted so I haven't even touched the exhaust portion of the car so I'm sure they're in the right position. Bought the car from an old lady who barely used it, 2010 with 54000 miles so far.

-HPFP is still stock.

-Reason I never floored is because as soon I do it, the car shakes and the check engine light comes on - 29D1 (Combustion Misfires - Cylinder #5)

If I do it about halfway, it wont trigger the misfire all the way to redline.

-I swap the injectors today and also tried a different OST map, Stage 2 - E50 mix map. With this map I can floor it from 2500rpm - 3rd gear and it wont activate the 29D1 until around 3500-4000RPM. Passed those RPM, I still get the cylinder 5 misfire. With the injectors swapped, I think we can deduce that the injector is not the culprit?
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      04-25-2019, 06:23 AM   #14
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Coils and plugs are cheap and easy, do a set from FCP and get new ones whenever you need. Try again after that and see what happens.

Definitely shouldnt have an issue flooring it anywhere in the rpm range, i only have had that issue when a coil dies.
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      04-28-2019, 03:19 PM   #15
minky27
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Coils and plugs were change not too long ago, less than 5k miles.
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      02-02-2022, 03:50 AM   #16
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Did you ever figure it out I’m having the same problem
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      02-02-2022, 02:50 PM   #17
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Minky hasn't posted since 10/19. I guess he gave up.
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      06-03-2022, 03:55 PM   #18
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was this issue resolved? im having the same issue but on cyl 3 on e40
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