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BMW 3-Series (E90 E92) Forum
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DIY: N54 HPFP Replacement
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05-04-2016, 03:27 PM | #23 | |
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Pretty sure my HPFP is failing on me. I believe you have the n54 like I do. What issue did you have to determine it was the HPFP failing? Also, where did you buy your replacement and at what cost? My 2007 is now at 205K miles. Yes, I drive her a lot! I had 1 HPFP replaced under CPO around 115k. Yesterday, my car literally just died on me when driving. Restarted with half engine and SES light. I pulled codes but then immediately (and accidentally) deleted them. But just before, I believe I saw a HPFP error code. Anyway, thanks in advance for any responses and thank you for the DIY! |
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05-04-2016, 03:41 PM | #24 |
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I use a Cobb tune, that allows me to log the fuel pressure requested and the fuel pressure supplied. When I would start the car, after sitting for a day or two, it would take several seconds for the NPFP to start building pressure. At the end it would require that I start the car several times before it would build pressure. It would also not be able to meet the pressure requested at high boost at higher RPM, sometimes it was 1,000psi below requested. If you have a way to monitor your rail pressure, you can see it failing.
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06-21-2016, 10:12 AM | #25 | |
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07-29-2016, 07:54 PM | #30 |
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I do have a question.... does anyone suggest replacing the fuel line that connects to the hpfp? I replaced the hpfp and my lpfp and still get a 2fdb shadow code for hpfp at start-up somewhat of a rough idle then it calms down.
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07-29-2016, 07:55 PM | #31 |
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07-10-2017, 02:46 AM | #33 |
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Slight thread revival but I am looking into this as I experienced a long crank this morning. No rough idle, misfires or CEL (yet) but want to know what I am in for.
Any other advice other than what's already in this thread? The how-to is so well detailed it makes it look easy! I know that wont be the case lol.
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Current car: E92 M3 6MT
Car history highlights: EP2 Civic, E92 335i M Sport, E92 325D M Sport - Stage 1, Mk5 Golf GTI - Stage 2+, E46 M3 6MT, E82 135i M Sport 6MT, Nissan 350z - Stage 3, Audi S3 - Stage 1 DSG, M135i Auto. |
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03-09-2018, 01:19 PM | #34 |
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this is great thread, thanks for writing it and the nice pictures.
I have a 2007 E92 w/ 90k miles. Never had any problems so far but I think my HPFP is starting to fail. Got the engine in limp mode twice, got both P142E and P3090 err codes. I've been looking for options to get a new pump and replace it myself. According to this thread as of 2015 the latest and greatest PN is 13517616170. Now doing a search for this comes back with prices ~$150 for remanufactured/refurbished and from $450-$900 for new. I have to do more research but it's just wired that there's such a big difference in prices from different sources. Not sure what/who to believe. |
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03-18-2018, 06:10 AM | #35 |
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I just did this job and I didn't take off the manifold at all. I also purchased a remanned unit from BMW of Seattle for $350 which comes with a two year warranty (no mileage restrictions) and full labor plus parts. I figured that's worth it if it messes up THEY will fix it this time.
Regardless thanks for the write up! |
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03-19-2018, 03:13 AM | #36 | |
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We could not get the junction box off the intake manifold, no matter how hard we tried (my father was a mechanic for 20+ years and even he couldn't). It was so hard and brittle, the plastic was just stretching when trying to release the clips. So like you, we did it without removing the manifold. Pain in the arse though!
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Current car: E92 M3 6MT
Car history highlights: EP2 Civic, E92 335i M Sport, E92 325D M Sport - Stage 1, Mk5 Golf GTI - Stage 2+, E46 M3 6MT, E82 135i M Sport 6MT, Nissan 350z - Stage 3, Audi S3 - Stage 1 DSG, M135i Auto. |
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04-21-2018, 10:55 PM | #37 |
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+ no intake manifold removal required.
the 3rd bolt removal is not as scary as it seems at first. you just need to insert the 5mil with the extension while looking from above between the intake manifold openings. once in place, just attach the handle and turn to unscrew thanks for write up! |
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11-22-2018, 05:19 PM | #38 |
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good effort bud
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11-23-2018, 01:12 PM | #39 | |
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Thank you for the awesome DIY! This helped me get going on this job and my car is running like a dream now with no long cranks. Rail pressure is immensely better.
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11-30-2018, 12:35 PM | #40 | |
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Stuart. No homo I love you. That was one of the hardest jobs I did -- because I didn't take the manifold off and I have an N55. Very good guy. Thank you so much. Mine failed at 80k. I guessed that it was the hpfp based on other posts and she runs perfectly now. Time to change the headers back now and tune her. 😈 |
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09-14-2019, 05:58 AM | #41 |
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Used this thread to change mine out yesterday. Did not remove intake as not necessary. Took about 2 hours to complete and car runs great now. Thanks for posting as I saved $d$ and had fun!
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12-19-2019, 10:40 AM | #42 |
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Thank you for this DIY! Very doable. I also did not removed the intake, although I can see why one should. I left the LPS in place as well as the E12 boot holding the low pressure line, which made tightening the rear bolt difficult as my long 5mm Allen socket was too long to attach a socket wrench to.
Honesty removing the wiring junction box off the intake was the worst part by far. That took me over an hour. |
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01-10-2020, 11:49 AM | #43 | |
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I also did the regulator and in tank fuel pump the day before. Anyway, this job is not as bad as the starter which I did a couple of years ago. You actually remove less. For this job I did not remove the intake nor did I see a need to remove the engine cover. I did remove it to change my plugs though. No point in doing the work and not changing the plugs. For the back side of the pump I use a long 5mm hex wrench with a ball end to allow correct angle. I use a 5mm socket with an extension on the end of the hex wrench to get enough leverage to break the bolt free. Then it was a piece of cake. So if I subtract the time to do the plugs and remove the engine cover, It took about 2..5 hours including clean up on a hot engine. I pulled the pump fuse and started the engine to depressurize the system before starting. I only had a small trickle of fuel when I cracked open the system. Anyway, it's like a 3 wrench job. No more difficult than plugs.
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