[535XrayIndigo]

Hey all,

I am getting a 29f2 code and rough startup. Almost like a misfire. However it goes away when the car goes to limp mode.

I have only Dual cone filters. No other mods.

Started running rough after hpfp replacement. I am thinking I got a bad one. If from the forums it appears this is code is common after replacing a hpfp. I also got cylinder 6 misfire so I replaced the injectors and the plugs and coils. I had a small leak from the lpf sensor line. Got that taken care of hoping that was it. Now I am at my wits end. Should I replace the hpfp again. Got it from FCPeuro so replacement cost is not a concern. I have seen injectors fix it for others. Misfire code is gone only the 29f2 code remains

Does anyone know exactly what causes this code?

[535XrayIndigo]

After doing some research can anyone point me to a guide on how to reset hpfp adjustments?

[535XrayIndigo]

Bump.

Looking for some help here. All of the threads I can find on the 29f2 end abruptly once the op figures it out and/or moves on without sharing a solution or reference a thread or site that is no longer active.

[nOshi]

Man that sucks, I'd try another HPFP. Could diagnose better if you have BMW specific scan tool or tune to see the HPFP values. Could also be the low pressure fuel sensor.

[535XrayIndigo]

I currently have inpa. Is there not a way to do it with that?

[nOshi]

Originally Posted by 535XrayIndigo

I currently have inpa. Is there not a way to do it with that?

From memory I don't think INPA has the capability to display that info.

[535XrayIndigo]

I am going to try resetting adaptations. Do you know which adaptation manages open loop pressure.

[nOshi]

Originally Posted by 535XrayIndigo

I am going to try resetting adaptations. Do you know which adaptation manages open loop pressure.

That would be outside the scope of INPA. It can reset all the adaptions for the car. But that term is in reference to an adjustment value used in piggybacks ex jb4. Unless your using a piggyback flash it won't apply in your case.

[535XrayIndigo]

Originally Posted by nOshi

That would be outside the scope of INPA. It can reset all the adaptions for the car. But that term is in reference to an adjustment value used in piggybacks ex jb4. Unless your using a piggyback flash it won't apply in your case.

Just to keep everyone updated as many of these threads die once the OP fixes the issue without follow up. I was able to follow the steps in the fuel it guide to reset fuel valve adaptations https://www.dropbox.com/s/fx6brmnn1y...tions.pdf?dl=0

It idled well and got rid of my 29f2 code. So if you are getting this code the fuel valve adaptation may be the fix.

Took the car for a drive and when I got on it I got a 29dc code. Checked and the leak is back. It appears to be right under the lpf Sensor. I will be replacing the line and replacing the new hpfp just to be sure.

[535XrayIndigo]

Went to replace the lpf Sensor line and the thermal compensator fell right off of the hpfp. this is the silver round piece just below the hpfp sensor connection. Anybody have experience with this. Hopefully this has been the cause. Replacing the lpf Sensor anyway as it $140 and I can have piece of mind knowing if it fails I can send it back.

[535XrayIndigo]

Car runs great after replacing hpfp. Was able to use a scope to check the valves and they are nasty. Due for a good cleaning.

[belzibmw]

535XrayIndigo - was it the leaking LPFS and/or the broken HPFS that was the fix? -
Why did you have to put in another new HPFP when that's what you did at the beginning of the thread?

my 2007 n54 has the rough idle start and throws limp mode most of the time now. But once its up to temperature, after clearing the limp mode, it usually runs great. Full power at WOT, etc.
- BUT - occasionally getting rough running and code 29DC injection cut out.
-and after clearing the code, runs great again.
SO I have a hard time believing that it can be either the LPFP or the HPFP if it can run full power.
ANy ideas? - THX

[yielo]

Hello Everyone,

First time really posting. Im 21. Ive owned an e92 n54 146k miles since feb and had been dealing with this same problem. it sat for months while i saved for parts. I bought a new fuel rail sensor, low pressure sensor, sparks, delphi coil pack, new walbro 450 diy stage 2 pump from ebay and a 104 dollar fuel pump from ebay that claimed to be new.

When I removed my hpfp that the car came with, the turning mechanism on the hpfp that connects to sprocket was completely snapped off. I was almost relieved because i thought installing ebay HPFP would solve everything. NOT THE CASE. The one that i bought spun freely and had a rougher idle than the broken hpfp??

I ended up buying a HPFP from FCP Euro. It my first purchase from them and the car fired up after reseting adaptations and had normal fuel rail pressure and low pressure fuel line pressure. car rev was responsive again and i dont need an alarm clock anymore. the will to live continues with this car. i recently bought a new water pump because it was leaking but it was the wrong one and didnt notice until i removed the high mileage one. They had different connectors and the new one comes in thursday.

I had previously owned an f series 228i and f series m235i. They were both lost in total losses caused by other drives in CA. i miss the m235i but my e92 n54 has been fun for all of 500 miles in 8 months of ownership. I am probably going to put 30 or 40k in mods! i wanna start an IG or something to track the progress.


Thank you, Yielo

[bsteven42]

Hello, I am new to the forum too. I have searched the crap out of forums trying to solve my 29F2 code and cold idle problem. Rough start at low idle like it's too low to sustain. Should be above 1000 but it dips and jumps around 500 at start. No prolonged cranking to start. If I hold down accelerator to keep rpm above 1k it eventually smooths out. Never any codes other than 29F2.

I too changed out the HPFP and it does exactly the same as before. Also changed out spark plugs, vac hoses, coolant temp sensor, high pressure fuel sensor, oil/filter twice, tightened wastegate rattle.

I haven't tried the fuel valve adapt but I will try it next.

Very frustrated!

[Ben54]

Hi everyone!
29F2- High-Preassure Fuel System, fuel pressure
Comes on directly on the start.
Replaced Sparks, coils, HPFP, LPFP, Both sensors, a friend told me to try replacing the fuel filter but after many researches it is inside the fuel tank and it comes all in one piece(Fuel supply module) which i also replaced and still nothing changed.
When i delete the code the cars gets back to its power for a few seconds and if i accelerate code:
29DC-Cylinder Injection cut Comes on. The engine starts to shake and big loss of power, still for a few seconds after i stop accelerating it gets back in its limp mode and dirves like a 100Hp car (
But!! I didnt try to reset adaptions yet (Hpfp) so it might be the next step im doing!

Thank you all for posting!
Ben.

[Ben54]

Originally Posted by Ben54

Hi everyone!
29F2- High-Preassure Fuel System, fuel pressure
Comes on directly on the start.
Replaced Sparks, coils, HPFP, LPFP, Both sensors, a friend told me to try replacing the fuel filter but after many researches it is inside the fuel tank and it comes all in one piece(Fuel supply module) which i also replaced and still nothing changed.
When i delete the code the cars gets back to its power for a few seconds and if i accelerate code:
29DC-Cylinder Injection cut Comes on. The engine starts to shake and big loss of power, still for a few seconds after i stop accelerating it gets back in its limp mode and dirves like a 100Hp car (
But!! I didnt try to reset adaptions yet (Hpfp) so it might be the next step im doing!

Thank you all for posting!
Ben.

Hello! I said ill try resetting adaptions on the hpfp, after ordering the K-Dcan cable and INPA installed, i finally got at the section where i could reset my car adaptions!! Which failed and got me mad. It says “error sys00015” which i googled. People been having the same issue due the old version of InPa you get from the CD they send in the pack. I am not sure yet if i could reset the adaptions and if it will fix my issue. Ill update this in a few weeks.
Ben

[kis2012]

Did you fix the 29f2 code issue? What was the cause?

[Beemermane]

Originally Posted by kis2012

Did you fix the 29f2 code issue? What was the cause?

Super interested in the answer as well!
I have an E92 335i and I’m chasing down the same problem with all of the same symptoms!!
So far I have:
New OEM plugs
New HPFP, followed the adaptation reset from PDF above perfectly and still the same symptoms
LPF sensor is on the way
Index 12 injectors coming this week
Anything missing fellas?
Everyone dips once they figure it out but will someone pls chime in?

[Beemermane]

Originally Posted by Ben54

Hello! I said ill try resetting adaptions on the hpfp, after ordering the K-Dcan cable and INPA installed, i finally got at the section where i could reset my car adaptions!! Which failed and got me mad. It says “error sys00015” which i googled. People been having the same issue due the old version of InPa you get from the CD they send in the pack. I am not sure yet if i could reset the adaptions and if it will fix my issue. Ill update this in a few weeks.
Ben

Pls give us an update 🙏🏼

[bsteven42]

I don't know if any of this helps but I have racked my brain for the past 9 months. 29F2 code, rough idle, stalls, limp modes. Replaced HPFP, plugs, coils, injectors, fuel pressure sensors. No changes. I bit the bullet and took it to my BMW dealer. $1800 for new BMW HPFP and high/low fuel pressure sensors. Car now starts, idles, and runs normal.

My bottom line: I needed a new BMW HPFP, not a remanufactured one.

[brakthru]

Originally Posted by Ben54

Hello! I said ill try resetting adaptions on the hpfp, after ordering the K-Dcan cable and INPA installed, i finally got at the section where i could reset my car adaptions!! Which failed and got me mad. It says “error sys00015” which i googled. People been having the same issue due the old version of InPa you get from the CD they send in the pack. I am not sure yet if i could reset the adaptions and if it will fix my issue. Ill update this in a few weeks.
Ben

You ever get this problem sorted out? What ended up fixing it?

[Killca_cze]

I would say its all about the same stuff - HPFP. Answers like “hpfp replaced” made me scared in past, “whats going on with my car, if ppl change their hpfps and nothing changed”, problem is, they all buy RMFD hpfps or just used ones and info i got years ago says HPFP and N54 injectors cannot be remanufactured, i didnt believe that, but now, now i believe. I have multi misfires, long crank, lower idle and injection cut out for about 6months, i have replaced LPFP for Walbro535, bypassed ekpm with direct strong wire from battery with wireless switch and 30A relay, replaced FPR unit in left tank side for new OEM one. And now, after 6 months, BOOM FIRE SHOT from exhaust after long cold start and new code lol, 29F2. LPF sensor is waiting in trunk, if nothing, then all injectors get out on paper, connect to rail line, disconnect wires and start the car, will see, if there is some fontain, if yes, one new OEM injector is in trunk also. And if still nothing, then really is time to get new OEM hpfp and its also reason to buy helix overdrive and put there 650? 700hp? with that TD04 turbos sitting in boxes in my room