E92 335xi (N55) Hesitation backfiring no codes

Toome · 02-26-2018, 02:04 PM

Any update on this? My logs are starting to look very similar to the above, and I am misfiring (especially after a shift). Rail pressure is dropping below 1400psi in several areas.

https://datazap.me/u/toome/mhd-stage...og=0&data=3-19

Pladi · 02-27-2018, 08:50 AM

Quote:

Originally Posted by Toome

Any update on this? My logs are starting to look very similar to the above, and I am misfiring (especially after a shift). Rail pressure is dropping below 1400psi in several areas.

https://datazap.me/u/toome/mhd-stage...og=0&data=3-19

In your log its very clear that after every shift your target rail pressure and actual rail pressure is very different. It could be the pump or the rail fuel pressure sensor. But its not a good condition. You are have LEAN condition misfires from lack of fuel during that period. Lean misfires are HOT misfires. Its not good for your engine. You can burn exhaust valves...

Toome · 02-27-2018, 10:10 AM

Quote:

Originally Posted by Pladi

Quote:

Originally Posted by Toome

Any update on this? My logs are starting to look very similar to the above, and I am misfiring (especially after a shift). Rail pressure is dropping below 1400psi in several areas.

https://datazap.me/u/toome/mhd-stage...og=0&data=3-19

In your log its very clear that after every shift your target rail pressure and actual rail pressure is very different. It could be the pump or the rail fuel pressure sensor. But its not a good condition. You are have LEAN condition misfires from lack of fuel during that period. Lean misfires are HOT misfires. Its not good for your engine. You can burn exhaust valves...

Wow that is alarming. Glad I am back to stock for now. I've had misfires like this less than a dozen times, so hopefully I haven't done any permanent damage. I have checked for codes several times nothing has ever popped up.

Pladi · 02-27-2018, 01:25 PM

no dont worry. You for sure have not done permanent damage. You would have to run lean for longer to get to danging temperatures. But so many people just download MHD and flash stage 2 and run without monitoring the car... if it was so easy BMW would have added these powers stock. Everything has a limit. Everything was built with limits in mind..

Toome · 02-27-2018, 02:09 PM

Quote:

Originally Posted by Pladi

no dont worry. You for sure have not done permanent damage. You would have to run lean for longer to get to danging temperatures. But so many people just download MHD and flash stage 2 and run without monitoring the car... if it was so easy BMW would have added these powers stock. Everything has a limit. Everything was built with limits in mind..

That's relieving. Guess the newer style Late-E series HPFPs fail when they are pushed too hard for too long (since I am the second person this has happened to). Hopefully an upgraded HPFP is going to be made available soon. Gonna replace the rail pressure sensor first to rule that out and go from there. I'll keep this thread updated with my progress/findings.

yayaya · 02-27-2018, 03:09 PM

Quote:

Originally Posted by Toome

Quote:

Originally Posted by Pladi

no dont worry. You for sure have not done permanent damage. You would have to run lean for longer to get to danging temperatures. But so many people just download MHD and flash stage 2 and run without monitoring the car... if it was so easy BMW would have added these powers stock. Everything has a limit. Everything was built with limits in mind..

That's relieving. Guess the newer style Late-E series HPFPs fail when they are pushed too hard for too long (since I am the second person this has happened to). Hopefully an upgraded HPFP is going to be made available soon. Gonna replace the rail pressure sensor first to rule that out and go from there. I'll keep this thread updated with my progress/findings.

I think I need to replace rail sensor too, Is this part just the fuel sensor? I could find rail sensor searching?

Toome · 02-27-2018, 03:16 PM

Quote:

Originally Posted by yayaya

Quote:

Originally Posted by Toome

Quote:

Originally Posted by Pladi

no dont worry. You for sure have not done permanent damage. You would have to run lean for longer to get to danging temperatures. But so many people just download MHD and flash stage 2 and run without monitoring the car... if it was so easy BMW would have added these powers stock. Everything has a limit. Everything was built with limits in mind..

That's relieving. Guess the newer style Late-E series HPFPs fail when they are pushed too hard for too long (since I am the second person this has happened to). Hopefully an upgraded HPFP is going to be made available soon. Gonna replace the rail pressure sensor first to rule that out and go from there. I'll keep this thread updated with my progress/findings.

I think I need to replace rail sensor too, Is this part just the fuel sensor? I could find rail sensor searching?

The rail pressure sensor is item #2 in that photo.

https://www.ecstuning.com/b-genuine-...r/13537620946/

Pladi · 02-27-2018, 03:39 PM

Quote:

Originally Posted by Toome

That's relieving. Guess the newer style Late-E series HPFPs fail when they are pushed too hard for too long (since I am the second person this has happened to). Hopefully an upgraded HPFP is going to be made available soon. Gonna replace the rail pressure sensor first to rule that out and go from there. I'll keep this thread updated with my progress/findings.

i would not hold my breath on any more upgraded HPFP. They new versions are designed for less pressure. Not more.

Toome · 02-27-2018, 03:42 PM

Quote:

Originally Posted by Pladi

Quote:

Originally Posted by Toome

That's relieving. Guess the newer style Late-E series HPFPs fail when they are pushed too hard for too long (since I am the second person this has happened to). Hopefully an upgraded HPFP is going to be made available soon. Gonna replace the rail pressure sensor first to rule that out and go from there. I'll keep this thread updated with my progress/findings.

i would not hold my breath on any more upgraded HPFP. They new versions are designed for less pressure. Not more.

I saw on "s p o o l s t r e e t" that Twisted Tuning is working on a solution.

Pladi · 02-28-2018, 08:30 AM

Quote:

Originally Posted by Toome

I saw on "s p o o l s t r e e t" that Twisted Tuning is working on a solution.

Interesting. LEts see what they come up with.

mwtrogus · 02-28-2018, 08:54 AM

I know Vargas and Twisted Tuning were looking at the older style HPFP for improvements to the HPFP or overdriving it with Vargas kit, not the newer plunger style in late E and F series cars.
Tuning Tech has a dual pump conversion from M cars for the plunger style, but wants $5k for the upgrade.
Xtreme- DI has been developing a solution for quite some time, but nothing on the market yet.

02-26-2018, 02:04 PM	#23
Toome Member 158 Rep 268 Posts Drives: 2012 E92 335i M-Sport Join Date: May 2017 Location: San Diego, CA iTrader: (0) Garage List 2012 BMW E92 335i [0.00]	Any update on this? My logs are starting to look very similar to the above, and I am misfiring (especially after a shift). Rail pressure is dropping below 1400psi in several areas. https://datazap.me/u/toome/mhd-stage...og=0&data=3-19 __________________ 12’ E92 335i 6AT - Alpine White M-Sports Package Mods - \| MHD Stage2+ ACN91 OTS Map \| K&N Drop-in \| VRSF Kittenless D0wnpipe \| VRSF CP \| VRSF 7” FMIC \| xHP Stage 3 \| Euro Headlight Switch \| Avant Garde M359 \| Michelin PS4S
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02-27-2018, 01:25 PM	#26
Pladi Lieutenant Colonel 722 Rep 1,753 Posts Drives: 2011 335i xdrive Join Date: Nov 2017 Location: Waterloo, ON Canada iTrader: (0)	no dont worry. You for sure have not done permanent damage. You would have to run lean for longer to get to danging temperatures. But so many people just download MHD and flash stage 2 and run without monitoring the car... if it was so easy BMW would have added these powers stock. Everything has a limit. Everything was built with limits in mind..
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02-28-2018, 08:54 AM	#33
mwtrogus --* 44 Rep 209 Posts Drives: 2014 X1 35i Join Date: Jun 2014 Location: PA iTrader: (1)	I know Vargas and Twisted Tuning were looking at the older style HPFP for improvements to the HPFP or overdriving it with Vargas kit, not the newer plunger style in late E and F series cars. Tuning Tech has a dual pump conversion from M cars for the plunger style, but wants $5k for the upgrade. Xtreme- DI has been developing a solution for quite some time, but nothing on the market yet. __________________ X1 35i M-Sport, Pure Stage 2 turbo w/ inlet and outlet, 7in intercooler, Fuel-It PI and pump, Jb4 w/MHD, XHP, custom catless exhaust, KW V1, Volk's and everything else...!
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