[theslowe90]

Hi all, I am pretty sure my hpfp is going out but just need some confirmation before I spend another $600 on my car...

I drive a 2011 E90 335i AT with the N55 engine. The car actually STALLED on me 3 times yesterday! It started as a rough idle in park after I came back from a drive, which then stalled after a few moments. However, I was surprised it didn't give me any CEL or half engine lights.



I later cleared the codes which kind of solved the issue but pretty sure it is going to happen again. Some symptoms I am experiencing are slow WARM starts. Car will crank once and then stops for about quarter of a second and then starts cranking again (the cranks are slow too which is a little different than the common hpfp failure which many have fast cranks). Cold starts are usually fine except sometimes the rpms fluctuate right after starting. Hopefully the lean codes are caused by the hpfp as well. Do you think this is just a hpfp issue or is there also other stuff going on?

[theslowe90]

Dang, no one could help confirm??? Ugh... I always knew my car is a bit different

[Emilime75]

Have a little patience, it's Sunday, the forum tends to not have a ton of activity over weekends.

Have you checked your battery and electrical? You shouldn't have a slow crank unless you've got a weak battery, a dying starter or a wiring/corrosion issue.

Doubtful this is effecting your HP fuel, but these cars are wacky sometimes when it comes to electrical.

[theslowe90]

Originally Posted by Emilime75

Have a little patience, it's Sunday, the forum tends to not have a ton of activity over weekends.

Have you checked your battery and electrical? You shouldn't have a slow crank unless you've got a weak battery, a dying starter or a wiring/corrosion issue.

Doubtful this is effecting your HP fuel, but these cars are wacky sometimes when it comes to electrical.

Battery should be fine as it was replaced last year. So yea, it might be a bad starter or a wiring issue. But I'm guessing those codes are only related to the hpfp right?

[Emilime75]

Seems that way, but if you were able to log various parameters it would be easier to confirm. What are you using to pull codes?

[theslowe90]

Originally Posted by Emilime75

Seems that way, but if you were able to log various parameters it would be easier to confirm. What are you using to pull codes?

MHD, but I am currently having issues with their login after they updated the app which doesn't let me monitor unless I login. I sent an email to them today for help with that. Anyways, my old log from a few months ago shows the rail pressure at 2100-2400 psi during WOT. Idle is around 700 psi.

[Emilime75]

Should be a little higher during WOT, I believe. 2400 is still OK, but not indicative of a HPFP that's really healthy...maybe it was on its way out back then and has now shit the bed...would still be best to see a current log.

[theslowe90]

Originally Posted by Emilime75

Should be a little higher during WOT, I believe. 2400 is still OK, but not indicative of a HPFP that's really healthy...maybe it was on its way out back then and has now shit the bed...would still be best to see a current log.

Yea, I will get back to it after I get my MHD login straightened out. Thanks for the reply though!
Lol the fuel pump is so unhealthy right now it stalled the engine... And the lean codes should also be caused by the hpfp right?

[bmw335ie90]

Originally Posted by theslowe90

Yea, I will get back to it after I get my MHD login straightened out. Thanks for the reply though!
Lol the fuel pump is so unhealthy right now it stalled the engine... And the lean codes should also be caused by the hpfp right?

I had 2BDE and 2BC0 codes on my 2011 n55, along with occasional long cranks when starting, crashing fuel pressures at WOT, weird idle when cold, and general bad performance. Replacing my HPFP solved those issues.

Yours sounds like a hpfp issue like mine was but it could also be: Fuel regulator, LPFP, fuel pressure sensor, or oxygen sensors for the lean codes. This tread might help you out a bit. https://www.e90post.com/forums/showt...=fueling+issue

[theslowe90]

Originally Posted by bmv335ie90

I had 2BDE and 2BC0 codes on my 2011 n55, along with occasional long cranks when starting, crashing fuel pressures at WOT, weird idle when cold, and general bad performance. Replacing my HPFP solved those issues.

Yours sounds like a hpfp issue like mine was but it could also be: Fuel regulator, LPFP, fuel pressure sensor, or oxygen sensors for the lean codes. This tread might help you out a bit. https://www.e90post.com/forums/showt...=fueling+issue

Did you need to reset adaptations after the hpfp replacement?

[bmw335ie90]

Yeah I reset it with MHD but it probably isn't necessary.

[theslowe90]

I am about to cry right now! I went for a drive today to see if my hpfp is still going to act up. Suddenly, my ABS, BRAKE, DSC lights came on and here are some new codes I got:

32C9 - Poor-road-surface detection: No wheel-speed signal received.
32D6 - Vehicle speed, wheel speed sensor rear/right, electrical: Malfunction.

Guess my luck really ran out huh? Now I need to deal with two problems

[pelon222]

I would recommend checking your battery voltage to make sure it's good and go from there

[Emilime75]

Yeah, back to voltage/electrical being suspect.

[theslowe90]

Hi all, finally got MHD to work. Here is the log with WOT and normal driving:


https://datazap.me/u/datslowe90/log-...&data=2-3-4-13


Battery voltage was around 13.85-14 the whole time

Rail pressure stays 2000+ during WOT

By the way I am getting some crazy timing corrections. Not looking good...

Any help would be greatly appreciated

[bmw335ie90]

You need to re-do the log and enable ALL data points on MHD. It looks like you only are recording the default points, you need to add all of them.

To do you a proper log put your car in 3rd gear and start logging on MHD. Get your RPM to around 3,000 and slam the throttle to the floor and pull all the way to 5,500-6,000 RPM. You can shift into 4th and continue pulling if you want but 3rd gear should give decent data. This is one of my logs for example.

https://datazap.me/u/bmv335ie90/log-...og=0&data=4-20

[theslowe90]

Originally Posted by bmv335ie90

You need to re-do the log and enable ALL data points on MHD. It looks like you only are recording the default points, you need to add all of them.

To do you a proper log put your car in 3rd gear and start logging on MHD. Get your RPM to around 3,000 and slam the throttle to the floor and pull all the way to 5,500-6,000 RPM. You can shift into 4th and continue pulling if you want but 3rd gear should give decent data. This is one of my logs for example.

https://datazap.me/u/bmv335ie90/log-...og=0&data=4-20

Okay, got it. I will report back once I get it correctly.

[theslowe90]

Originally Posted by bmv335ie90

You need to re-do the log and enable ALL data points on MHD. It looks like you only are recording the default points, you need to add all of them.

To do you a proper log put your car in 3rd gear and start logging on MHD. Get your RPM to around 3,000 and slam the throttle to the floor and pull all the way to 5,500-6,000 RPM. You can shift into 4th and continue pulling if you want but 3rd gear should give decent data. This is one of my logs for example.

https://datazap.me/u/bmv335ie90/log-...og=0&data=4-20

Finally had the chance to do this correctly. Here is the log.
Looks like I am not hitting boost target as well, but let me know if other things are wrong. Thanks!
https://datazap.me/u/datslowe90/log-...-5-10-20-21-22

[bmw335ie90]

Originally Posted by theslowe90

Finally had the chance to do this correctly. Here is the log.
Looks like I am not hitting boost target as well, but let me know if other things are wrong. Thanks!
https://datazap.me/u/datslowe90/log-...-5-10-20-21-22

Your fuel pressure looks okay in the log. Boost does seem low though, I would check the intercooler and charge pipe for leaks.

With that said, my fuel pressure looked similar to your log even though my pump was failing. It's impossible to say for certain but your symptoms and codes do indicate a possible pump problem.

What sucks is it looks like FCP is currently price gouging their rebuilt fuel pump, I paid $500 less than a year ago (which is still outrageous for a rebuilt pump). Unfortunately they are one of the few sources of genuine rebuilt fuel pumps, with a warranty, and I think they realized that.

[theslowe90]

Originally Posted by bmv335ie90

Your fuel pressure looks okay in the log. Boost does seem low though, I would check the intercooler and charge pipe for leaks.

With that said, my fuel pressure looked similar to your log even though my pump was failing. It's impossible to say for certain but your symptoms and codes do indicate a possible pump problem.

What sucks is it looks like FCP is currently price gouging their rebuilt fuel pump, I paid $500 less than a year ago (which is still outrageous for a rebuilt pump). Unfortunately they are one of the few sources of genuine rebuilt fuel pumps, with a warranty, and I think they realized that.

Thanks man, really appreciate the replies! I will DIY the fuel pump but let a shop take care with the boost issue...
But do you think my cold air intake from AFE power has anything to do with my boost issue?

[BM3Rrrr]

That log looks terrible..... underboosting, running really rich, crazy timing

Adjust your logging parameters again....still alot of useless info on it.
Run the below as a minimum

time
accel ped pos%
boost psi
boost mean psi
boost target psi
cyl timing cor 1
cyl timing cor 2
cyl timing cor 3
cyl timing cor 4
cyl timing cor 5
cyl timing cor 6
Fuel low pressure sensor psi
iat c
lambda bank 1 afr
lambda bank 2 afr
load actual
rail pressure psi
rpm
stft 1%
stft 2%
throttle position
timing cyl. 1 crk
wgdc bank 1%

[theslowe90]

Originally Posted by BM3Rrrr

That log looks terrible..... underboosting, running really rich, crazy timing

Adjust your logging parameters again....still alot of useless info on it.
Run the below as a minimum

time
accel ped pos%
boost psi
boost mean psi
boost target psi
cyl timing cor 1
cyl timing cor 2
cyl timing cor 3
cyl timing cor 4
cyl timing cor 5
cyl timing cor 6
Fuel low pressure sensor psi
iat c
lambda bank 1 afr
lambda bank 2 afr
load actual
rail pressure psi
rpm
stft 1%
stft 2%
throttle position
timing cyl. 1 crk
wgdc bank 1%

My MHD is acutally missing a few parameters from that list (probably because it is an N55) but I will log it again.

Funny how my car is actually giving me lean codes but some how it runs rich during WOT...