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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > HPFP :(



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      08-03-2012, 10:13 PM   #45
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Quote:
Originally Posted by 2wheelsrbetter View Post
steven - glad to hear you're back in business! and that you didn't have to change out the lpfp.
did you get the sensor from auto parts warehouse too? do you have the part # or link? i'm going to order and try this and see if it fixes my issue.
sounds like this will be my chance to check/clean the intake valves on the new motor... luckily my miata build just passed inspection yesterday so i can park the 3 for a bit to do this.

and for future hpfp reference, no one should have an issue getting that replaced - my car was totalled (ALL warranty gone) and is now modded, and they didn't blink an eye when i got those codes.
I didnt buy the sensor from Auto Parts Warehouse. I went to the dealer to get the LP sensor (part #13537614317) Sells for $79 but with a mechanics discount you can pick it up for $67 dollars. You are corrrect as to doing an overhaul on other parts while you change out the sensor..Your symptoms are the same as mine and if thats the case this LP sensor will address the issue..You should use INPA and get the reading in Measurement Block 6 of the low pressure sensor to give you an idea if the sensor is shot. Nominal values should hover around 5000~ Hpa, if its alot higher than most likely the sensor is shot
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      08-04-2012, 11:21 PM   #46
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hmmm guess i need to figure out what inpa is... took a break from messing with the car for a while. sounds like i have some reading to do and software to learn. damn this car keeps me busy if i let it
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      08-05-2012, 06:48 PM   #47
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Quote:
Originally Posted by 2wheelsrbetter View Post
hmmm guess i need to figure out what inpa is... took a break from messing with the car for a while. sounds like i have some reading to do and software to learn. damn this car keeps me busy if i let it
INPA is a very useful tool to help diagnose our cars. If your a DIY guy it's a must have. Reads codes, clears codes, and performs tests on individual components and can show a roundabout way what is wrong with car.
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      08-05-2012, 07:24 PM   #48
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Quote:
Originally Posted by cn555ic
Quote:
Originally Posted by 2wheelsrbetter View Post
hmmm guess i need to figure out what inpa is... took a break from messing with the car for a while. sounds like i have some reading to do and software to learn. damn this car keeps me busy if i let it
INPA is a very useful tool to help diagnose our cars. If your a DIY guy it's a must have. Reads codes, clears codes, and performs tests on individual components and can show a roundabout way what is wrong with car.
What's required. Same as coding? Just the obdII to usb cable ?
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      08-05-2012, 07:26 PM   #49
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What's required. Same as coding? Just the obdII to usb cable ?
Yeah same as coding..
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      08-05-2012, 07:59 PM   #50
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can i check values for this with my BT tool? don't have much time to learn new stuff right now
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      08-05-2012, 08:37 PM   #51
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Quote:
Originally Posted by 2wheelsrbetter View Post
can i check values for this with my BT tool? don't have much time to learn new stuff right now
I guess you have to also learn BT tool also. You should already know that if you have it. Play around with it and find out if it does. You know more than me when it comes to BT tool!
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      08-05-2012, 09:53 PM   #52
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My car was acting like yours. Dealer told me it was the low pressure fuel pump. It was replaced and I had them replace the fuel filter. Good thing I have a cpo and paid the deductible for the pump. Filter was expensive. Had them replace all vacuum lines. Car runs good and sounds better. I installed my jb+ and couldn't be happier. Hopefully that's all I need. HPFP was replaced before I bought my car.
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      08-06-2012, 09:24 PM   #53
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Turn up the boost to 17 psi today from 15 on a WOT run with meth to test it and everything is back to normal. (0-110 mph) The car runs perfect, in fact it seems to run better than I ever remembered. Funny how a faulty sensor can make the car run so terrible. Again I cant stress this anymore...Anyone with a 29F3 code, change out the Low Pressure sensor..
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      08-06-2012, 10:32 PM   #54
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Hey CN, sorry didn't read your thread but had some questions.
1. Did you diagnose LP sensor from INPA. If so, what did you observe?
2. Can you read voltage to the LP pump from INPA.
3. Using INPA to diagnose, can you do this while ragging the car? But only real time info?
4. Is the LP sensor the only part you changed during your troubles.
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      08-06-2012, 10:39 PM   #55
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Quote:
Originally Posted by Joshboody View Post
Hey CN, sorry didn't read your thread but had some questions.
1. Did you diagnose LP sensor from INPA. If so, what did you observe?
2. Can you read voltage to the LP pump from INPA.
3. Using INPA to diagnose, can you do this while ragging the car? But only real time info?
4. Is the LP sensor the only part you changed during your troubles.
1. I used INPA to read the codes and then got some feedback from good sources and many of them stated it was the low side based on my codes, so I check the pressure sensor reading which was determined to be a faulty reading. Norm is 5000 Hpa

2 you can perform a LPFP test with INPA, but I did not go to that step. I would probably have if sensor did not fix my issues

3. with my tune Procede, I can not communicate with INPA unless it is in valet mode (map 0). So can't see really time with tune but only stock form.

4. Yes LP sensor was only thing I changed, but I have the LPFP waiting if I need to install it as I already bought it..
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      12-12-2012, 07:11 PM   #56
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Does anybody know how to get to that measurment block6 screen in INPA? I'm trying to test and see if my lpfp sensor is bad.
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      12-12-2012, 07:13 PM   #57
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That screen
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      12-12-2012, 08:48 PM   #58
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Quote:
Originally Posted by Quing View Post

That screen
to get to that page in INPA

>Choose E90
>Engine
>MSD80
>F5 Status Analog \ Digital
>F2 Analog Measurement Block
>F6 MWB6


A value around 5000 Hpa is normal...If you have a hPa value that is pegged higher then ~5000 Hpa then the sensor is shot and needs to be replaced. Mine was pegged at 7403 and did not fluctuate at all...

Good luck
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Last edited by cn555ic; 12-12-2012 at 10:18 PM.
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      12-12-2012, 11:37 PM   #59
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Thank you my friend.
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      12-13-2012, 01:48 PM   #60
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wow this forum is amazing. now i'm scared to go FBO.

I just need DP's now and that is prob the worse part for codes.
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