[apwcu]

Just recently got a 2011 335d with 84k miles, it's a sport, tuned with BPC stage 1 emissions intact tuning and trans tune. The car ran great for about 500 miles and then randomly started having no power above 3000 rpm, it would pull hard until 3k and then the power would die off and it would start hesitating like it was trying to pick up power and then it would drop off again.

By looking at the vacuum hoses, I decided to go ahead and tear it down and just go ahead and replace them, along with the pressure converters. I'm just trying to prevent further issues down the road and I definitely don't want to do this twice. It has had the carbon clean done about 10k ago.

Along with replacing these, are there other items I need to do while I have it run apart? Are the switch over valves common to go bad? I already checked the boost hose and it looks good with no oil, I'll probably replace it anyways along with balancer at some point.

I love the car and want to do any work while I'm at it to make it reliable for a long time. Thanks for the help.

[apwcu]

I forgot to mention, very shortly after this i had the diesel particulate filter message pop up in the nav, along with the service engine soon and had codes for dpf pressur high I believe? I need to check back and see which code it was.

It looks like every thread I read with a pressure converter issue is for boost below 3k, mine is fine until the big turbo comes in and then it just surges and feels like it's trying to go but it won't.

[apexit4]

Definitely do a code scan and report back with what you find, it will be easier to determine the issue with that information.

I experienced something similar to what you described a while back and it turned out to be the HPFP (I didnt get a DPF message though). It doesnt sound like thats your issue though based on the message you were displayed.

[Thecastle]

Sounds like you have multiple probably minor problems.

Get a code scanner and pull the actual codes.

My guess is that you have some bad turbo vacuum lines, and possibly other things in this area.

The DPF is possibly a burned through vacuum line, or a bad t-stat has prevented regeneration.

[apwcu]

The code is P14A7. I know the thermostat was replaced by the previous owner just a couple thousand miles ago.

I did notice the fan running after I shut the engine down a couple times before this happened.

[apwcu]

Also, if I was driving and kept the rpms below 3k and shifted the trans to keep rpms lower it would accelerate hard, it's just when it got above 3k it would do this.

[klingon55]

Originally Posted by apwcu

Also, if I was driving and kept the rpms below 3k and shifted the trans to keep rpms lower it would accelerate hard, it's just when it got above 3k it would do this.

You may need to contact BPC to have them update the tune so that you can see all the codes. There should be more than just one code for something like this. It can make it hard to diagnose otherwise.

[BB_cuda]

Go google cluster temperature monitoring. I learned how to do this on youtube. New thermostat isn't a guarantee that coolant temp is right. Coolant temp too low will not let DPF genens run right. If fan was running after shutdown before latest power problem >3000 rpm, that was good news. You are likely fine but this way you know how to monitor coolant too. Good luck

[robnitro]

p code is not going to help. A proper bmw code scanner like the free b-tool lite on Google play with a bt obd adapter will give us the proper internal bmw codes.

[apwcu]

Bought a Bimmergeeks pro tool, now I can see codes 480a and 481a. I also tried to do a manual regen from the app but it says it was unsuccessful and to check that the car is running.

Also, I replaced all vacuum lines and the 2 pressure converters. Car is still acting the same as before.

[robnitro]

What is your coolant temperature?

[apwcu]

I checked with the app today, it got up to 202 degrees farenheit.

[robnitro]

Dpf blocked codes... There's a trick some have done with the differential pressure sensor to fool it enough to allow a regen to happen but I lost the link.

Found link https://www.bimmerfest.com/forums/sh...php?p=11852209

[apwcu]

Well, I took a long drive this morning up in the NC mountains and used the protool to clear codes every 10 seconds. After about 40 minutes I check to see if they were back and they were gone! I rolled into it and had full power back. I have made a few longer trips trying to get it to regen but this is the first time I cleared the codes constantly while driving.

Thanks for the help, hopefully this will hold up for a bit until I decide to delete or not.

[robnitro]

Maybe now you can force a regen.

What you might have done is burned off some in your driving, essentially a passive regen
.. Enough so that the differential pressure isn't too high anymore across the dpf

[Coorslightking]

Did you get the upper rpm power back? Clogged dpf could be the cause. U know i got particulate codes and would reduce power. Id run some injector cleaner(hot shots or w/e). Do the deletes! Or at least get them tuned out.

[apwcu]

Power is definitely back at all rpms, I still can't do a forced regen from the protool. Not sure if it just isn't an option yet or what.

Do you still have to send the dde off to get tunes?

[B58]

DPF pressure high normally means the DPF is plugged or the pressure line going to the sensor is plugged with soot and it can throw a fault for high pressure. I would try to drive the car at highway speeds and see if the regen would clear it up.

(I'm a certified Diesel Mechanic with 8 years of commercial truck diagnostic and repairs in relates to Cummins, Detroit Diesel, and CAT engines so what we have on our 335d is the same exact setup commercial trucks have and what I'm telling you is from my experience. The only difference is the commercial truck DPF can be removed and cleaned and re-installed in situations like this if needed)

[robnitro]

Reposted
Dpf blocked codes... There's a trick some have done with the differential pressure sensor to fool it enough to allow a regen to happen but I lost the link.

Found link https://www.bimmerfest.com/forums/sh...php?p=1185220

You can fool the diff pressure sensor and then drive to get a regen, read the thread

[apwcu]

I think the link above is incorrect?

[robnitro]

They mucked it up... The site was recently updated, search for "dpf differential hose regen". I'll post it off I can find it
Found it
https://www.bimmerfest.com/forums/sh...php?p=11852209

[Yozh]

Please monitor your EGTs, Exhaust Pressure. You need to assure yourself that you are actually going through regenerations. My fear is the BPC tune may not be fully functional at this stage 1 level. It’s a hard one to get right. Easier to make a tune for full deletes. Someone mentioned a tune update. May not be the worst idea. BPC is known to have struggled eith a few tune related issues in the past.