[Pladi]

Since my car is away for the winter i cant try this soon but i have never noticed this issue before. What i am thinking is : The pump is driven off the belt that is also connected to the crank. Sounds like close to the limit of the steering the pump is bogging the engine due to an increased and unexpected load for whatever reason. This could just be the design of the system and the software is just there to alleviate the symptoms.. thats why we might never find a fix until a new steering pump design maybe..

Engine surges due to extra load then tries to compensate ..

[Street of Rage]

yea... can't be fixed unless BMW issues free DME update for that.. lol

[BringMyWallet335i]

Looks like no one has found a remedy yet. Been happening to me for about a year now, starting to concern me. Also just as someone else mentioned above, when i cruise around 60mph it feels like the car hiccups when there is no gas applied.

Any advice?

[Street of Rage]

Justin from Twisted Tuning, in association with MHD Flasher stated that he wants to increase idle on N55 engine to ~900rpm, which he's currently performing long term testing (He mentioned it somewhere in that thread). Factory default is little above 600rpm. I'm just waiting for the official release and HOPE the MHD update will somewhat compensate this surging issue.

[MiamiM3]

I actually believe that may fix it. It seems like steering inputs put enough of a load on the engine that the idle drops down to 500 rpm and the dme responds by bumping the idle up, which results in the surging effect.

[Street of Rage]

I agree also. Let's prayyyyyy.

[Jaxmemo]

Just curious, has anyone here replaced the vanos solenoids? I am wondering if that could be the culprit?

[Street of Rage]

That's an interesting point of view...usually bad/dirty vanos solenoids would affect RPM fluctuation on idle... hmm...

[JUMAS]

Just wanted to document, I have the same issue, I recently had my valve cover replaced due to a faulty pvc on my n55. New spark plugs.

[Jeyoller]

Has anyone in this thread replaced the vanos solenoids? if so, did it changed anything ? been reading more and more about vanos and im thinking it might somehow be related to our issue...

[Street of Rage]

Just a heads up on MHD v1.51 beta, which still going on, with the RPM idle adjustment, it does not fix or improve the issue. It only allows user to adjust RPM idle in Park or Neutral position (AT)

I clean my VANOS solenoid last summer due to minor RPM fluctuation randomly, it helped with just the random RPM fluctuation but did not affect steering pump causing the surge....

Let us keep praying Twisted Tuning would help us on this along with more tweaks. He's only concerned with OTS map adjustment currently due to timing correction for some MHD users.

[Street of Rage]

Has anyone found any update/improvement on this issue?

[andrews920]

I just wanted to state that I have experienced this problem as well. Second owner of a completely stock 11 335 m sport. Car only has 48k and the surging is very pronounced while steering at idle. Any solutions yet?

[Pladi]

Let me be clear that i do not see this issue with my car but it sounds like the steering pump is creating a load on the crank that is "unexpected" or "un measured". Has anyone replaced the steering pump for this issue ? Or has anyone replaced the steering fluid or flushed the fluid and does that change anything ?

[Street of Rage]

Originally Posted by Pladi

Let me be clear that i do not see this issue with my car but it sounds like the steering pump is creating a load on the crank that is "unexpected" or "un measured". Has anyone replaced the steering pump for this issue ? Or has anyone replaced the steering fluid or flushed the fluid and does that change anything ?

This could be a thought...

[JB4N]

Originally Posted by Pladi

Let me be clear that i do not see this issue with my car but it sounds like the steering pump is creating a load on the crank that is "unexpected" or "un measured". Has anyone replaced the steering pump for this issue ? Or has anyone replaced the steering fluid or flushed the fluid and does that change anything ?

Definitely a possibility. Updating the DME helped a little, but the surge is still there for me. I will look into flushing my power steering fluid and seeing if it makes a difference.

[Pladi]

Originally Posted by JB4N

Definitely a possibility. Updating the DME helped a little, but the surge is still there for me. I will look into flushing my power steering fluid and seeing if it makes a difference.

ok cool because an engine surge usually due to 2 things... vacuum leak and load on the engine without added gas/rpm. When you turn the steering you are probably creating more load since everything is connected through the serpentine belt..

what happens if you press the gas more and try to turn the wheel ? Like 1500-2000 rpm ?

[JB4N]

Originally Posted by Pladi

ok cool because an engine surge usually due to 2 things... vacuum leak and load on the engine without added gas/rpm. When you turn the steering you are probably creating more load since everything is connected through the serpentine belt..

what happens if you press the gas more and try to turn the wheel ? Like 1500-2000 rpm ?

If I turn the wheel and give it gas the car just lurches forward and the rpms shoot up and down.

[BeaterM3]

Originally Posted by Street of Rage

Just a heads up on MHD v1.51 beta, which still going on, with the RPM idle adjustment, it does not fix or improve the issue. It only allows user to adjust RPM idle in Park or Neutral position (AT)

I clean my VANOS solenoid last summer due to minor RPM fluctuation randomly, it helped with just the random RPM fluctuation but did not affect steering pump causing the surge....

Let us keep praying Twisted Tuning would help us on this along with more tweaks. He's only concerned with OTS map adjustment currently due to timing correction for some MHD users.

Has the new update/s of MHD remedied this issue? I have the same problem with my 2011 E92 335xi

[Street of Rage]

Originally Posted by revengeismine

Has the new update/s of MHD remedied this issue? I have the same problem with my 2011 E92 335xi

Nope. It did not address this issue.

[bizzleb109]

sometimes if you have low power steering fluid it can strain the pump and cause the engine to surge due to pump drawing more power

[Street of Rage]

Fluid is filled to the line indicated.. \(o.O)/