Intermittent loss of oomph

[Asiah119]

I noticed this starting in maybe a week ago or so. Moreso under spirited, but not flat out accel I would be going on my merry way and then around the 4k mark I'd hit a highly noticeable slump and then the power would be back on in full. I also noticed a slight, fraction of a second power loss while driving last night cruising at highway speeds. Thoughts? No CEL, fuel filter is new. VANOS might be rattling a bit but I have to really pay attention to notice it.

[Avetiso]

Debate incoming in 3, 2, 1...

Anyways, people will say you need the "Jersey Fix" which is essentially BMW flashing new software to your DME to fix the issue. There is evidence, however, that all they do is disable the DISA. On the other hand, I've updated to the most recent mainstream software and had my DISA and VANOS fixed and still had the issue, as do many other ZHP owners.

You can never fully get rid of it. You may flash a tune that minimilizes it, but a dyno run will always show a dip that 4,000rpm.

[mbeckel]

Debate incoming in 3, 2, 1...

Anyways, people will say you need the "Jersey Fix" which is essentially BMW flashing new software to your DME to fix the issue. There is evidence, however, that all they do is disable the DISA. On the other hand, I've updated to the most recent mainstream software and had my DISA and VANOS fixed and still had the issue, as do many other ZHP owners.

You can never fully get rid of it. You may flash a tune that minimilizes it, but a dyno run will always show a dip that 4,000rpm.

I think it boils down to each engine being a little different from one to another.

[Asiah119]

The only thing that has me sketchy about this being "the" dip. Is that I'm doing my standard driving and this is new; pronounced enough for me to think that I'm letting off of the gas, or that the clutch is slipping; and that it feels quasi similiar to when I get fuel starvation when I'm on the track.

[Avetiso]

I think it boils down to each engine being a little different from one to another.

They are all designed the same. I think enough people have the issue that we can consider a design flaw.

[Newjack]

Debate incoming in 3, 2, 1...

Anyways, people will say you need the "Jersey Fix" which is essentially BMW flashing new software to your DME to fix the issue. There is evidence, however, that all they do is disable the DISA. On the other hand, I've updated to the most recent mainstream software and had my DISA and VANOS fixed and still had the issue, as do many other ZHP owners.

You can never fully get rid of it. You may flash a tune that minimilizes it, but a dyno run will always show a dip that 4,000rpm.

God the last thing I want is New Jersey doing anything to my car.

Maybe I'm just not observant enough, but I don't notice a 4k dip in my car. VANOS has been fixed with the besian seals and my disa valve has been fixed with the G.A.S. kit.

No New Jersey required.

[az3579]

The power dip you all are referring to is not what he is describing. The "power dip" hardly has any real effect on actual acceleration. What he is describing is a complete loss of power at that area of the power band. Fuel starvation is not fun; if it feels like that, then almost all of the power (if not, all of it) is gone for that brief moment. It's literally as though you completely took your foot off the throttle...

[TheFinanceGuy]

I have to agree with Botond on this one.

OP- what is the current mileage? Could be a failing fuel pump, or pressure regulator.

[Asiah119]

In the low 89k range.
Would be nice if the car would throw a code at me.

[PdZHP]

I had similar symptoms until this weekend when my car would just not start, no codes either. Fuel pump is dead, should be installing the new one this afternoon. I am about 70k miles as well.