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View Full Version : HPFP Problems in N55/N63


masku
03-25-2010, 06:24 PM
Given the numerous HPFP problems in the N54 (http://en.wikipedia.org/wiki/BMW_N54) Engine (I've had my share),
what is the verdict so far on similar problems with the N55 (http://en.wikipedia.org/wiki/BMW_N55)/N63 (http://en.wikipedia.org/wiki/BMW_N63) Engines?
Any data available for these engines so far?

BMW_F1
03-25-2010, 07:35 PM
Well effectively nobody has a car with the N55 yet so there is no reliability data. As far as I know the N63 TT V8 has not had any major issues, so at least the 550i should be solid on the powertrain, but launch year BMW's are never the most reliable.

kwoolf1
03-25-2010, 09:28 PM
I'm on the fence between the new 535i vs. 550i. Since I'm buying instead of leasing I may go with the 550i for peace of mind since the engine has already been out since 2007. May still have hpfp issues but who knows? Does anyone agree that the 550 is a safer bet than the 535 with respect to reliability? Thanks.

grover432
04-03-2010, 09:44 PM
Hfpf??

BMWTX
04-04-2010, 06:45 AM
Given the numerous HPFP problems in the N54 (http://en.wikipedia.org/wiki/BMW_N54) Engine (I've had my share),
what is the verdict so far on similar problems with the N55 (http://en.wikipedia.org/wiki/BMW_N55)/N63 (http://en.wikipedia.org/wiki/BMW_N63) Engines?
Any data available for these engines so far?

What does HPFP mean? Thanks.

Munich77
04-04-2010, 07:03 AM
High Pressure Fuel Pump. The HPFP is necessary to pressurize the fuel right for the direct injection. As far as I know the N54, N55 and N63 all have an HPFP.

On the N54 powered cars (135i, 335i, 535i and X6 35i) the HPFP has been known to fail. Another somewhat common problem is fuel injector failure. What happens is that at a random milage the car gives you the warning engine malfunction reduced power which is typically an indicator that the HPFP fuel pump might be out. There are other symptoms too such the engine taking a long time to crank. Thus far, BMW has been unable to fix the problem which has been occurring since the 2007 model year. It is the achilles heal of the N54 engine. Very unfortunate - personally I have had one HPFP and a whole new set of fuel injectors on my 535 i which only has like 22,XXX odd miles.

carnuts3
04-04-2010, 07:22 AM
I'm on the fence between the new 535i vs. 550i. Since I'm buying instead of leasing I may go with the 550i for peace of mind since the engine has already been out since 2007. May still have hpfp issues but who knows? Does anyone agree that the 550 is a safer bet than the 535 with respect to reliability? Thanks.

I'm in the same situation as you. Without extensive info on the N63 and new N55, it's too early to determine what engine is more reliable. Even so, if the N54 was still used in the F10, it would be a much easier decision for me to go with the 550. But being an optimist, I am thinking that BMW has learned from the N54 experience and has consequently improved the reliability of new N55.... but only time will tell. Weighing this hope against the potentially lower resale value of the 550, I am leaning toward taking my chances with the N55. But, I can be convinced otherwise. I also welcome other comments/opinions.

Munich77
04-04-2010, 08:15 AM
I have not heard much about the N63 - but there should be some data out there since it has been offered in both the X6 and the 7 series. I wonder how the engine has performed in those cars. The new 535i perform about the same in normal driving as the N54 535 despite being heavier.

grover432
04-04-2010, 08:58 AM
High Pressure Fuel Pump. The HPFP is necessary to pressurize the fuel right for the direct injection. As far as I know the N54, N55 and N63 all have an HPFP.

On the N54 powered cars (135i, 335i, 535i and X6 35i) the HPFP has been known to fail. Another somewhat common problem is fuel injector failure. What happens is that at a random milage the car gives you the warning engine malfunction reduced power which is typically an indicator that the HPFP fuel pump might be out. There are other symptoms too such the engine taking a long time to crank. Thus far, BMW has been unable to fix the problem which has been occurring since the 2007 model year. It is the achilles heal of the N54 engine. Very unfortunate - personally I have had one HPFP and a whole new set of fuel injectors on my 535 i which only has like 22,XXX odd miles.

Thanks. Is this a high failure rate problem or a small number of cars? I wonder if the part number for the pump is the same in the new turbo 6 engine. Of course it could be a different number with the same design defect. I'd like to buy vs lease this time but wouldn't like to be stuck with a large repair bill from a design problem 5 years out. I guess an extended warranty would solve that fear. :(

masku
04-04-2010, 11:37 AM
I am glad that the N54 engine is on its way out. Have had the HPFP replaced twice and the Cold Start problem still hasn't gone away. N63 has been out there in a few vehicles now so I am optimistic that there will be no problems with N63. Hard to say the same about N55 at this time.

Munich77
04-04-2010, 01:17 PM
Thanks. Is this a high failure rate problem or a small number of cars? I wonder if the part number for the pump is the same in the new turbo 6 engine. Of course it could be a different number with the same design defect. I'd like to buy vs lease this time but wouldn't like to be stuck with a large repair bill from a design problem 5 years out. I guess an extended warranty would solve that fear. :(

I would expect the new engines to have a different HPFP. It is hard to say how prevalent the problem with the HPFP is. There seems to be no rhyme or reason to what causes the failure on the N54 engine. Cars work fine and then all of a sudden the fuel pump goes out.

sdbrandon
04-05-2010, 09:43 AM
I'm on the fence between the new 535i vs. 550i. Since I'm buying instead of leasing I may go with the 550i for peace of mind since the engine has already been out since 2007. May still have hpfp issues but who knows? Does anyone agree that the 550 is a safer bet than the 535 with respect to reliability? Thanks.

Agreed.

The 550/650/750 engine actually came out in 2006.

However, it was a modified version of the 545/645/745, and cooincidentally that engine was a modified version of the old 8 series (840) from the 1990's.

So I believe the V8 will be much more reliable, or at least has a much longer history in order to work out bugs and add improvements.

Munich77
04-05-2010, 10:14 AM
Agreed.

The 550/650/750 engine actually came out in 2006.

However, it was a modified version of the 545/645/745, and cooincidentally that engine was a modified version of the old 8 series (840) from the 1990's.

So I believe the V8 will be much more reliable, or at least has a much longer history in order to work out bugs and add improvements.

That is true but the new engine that is in the F10 550i is identical to the V8s in the X6 and F1 7 series which are different than the 550/650/750 to which you are referring. I think the new V8s first came out in 2008.

grover432
04-05-2010, 11:01 AM
That is true but the new engine that is in the F10 550i is identical to the V8s in the X6 and F1 7 series which are different than the 550/650/750 to which you are referring. I think the new V8s first came out in 2008.

Has the HPFP been an issue in these vehicles as well?

sdbrandon
04-05-2010, 11:34 AM
Has the HPFP been an issue in these vehicles as well?

Primarily 2007 335's. Less and less each year.

enigma
04-06-2010, 01:11 AM
Primarily 2007 335's. Less and less each year.

E9x, E89, E60 and x6 owners don't agree with you. Just google HPFP, and you'll find even '09 and '10 owners are still getting it. Worse yet, those supposedly improved or fixed pumps to replace the original ones are still failing at an alarming rate.

Granted it's not a catastrophic failure (i.e. you can "limp" home), it's still something that you think about on long trips.

masku
04-09-2010, 12:13 AM
Seems at least one problem reported for the N63
http://wwww.bimmerfest.com/forums/showthread.php?p=4810831#post4810831

Munich77
04-09-2010, 05:23 AM
E9x, E89, E60 and x6 owners don't agree with you. Just google HPFP, and you'll find even '09 and '10 owners are still getting it. Worse yet, those supposedly improved or fixed pumps to replace the original ones are still failing at an alarming rate.

Granted it's not a catastrophic failure (i.e. you can "limp" home), it's still something that you think about on long trips.

So true. I am just wondering how frequent the problem indeed is. I have had the HPFP and fuel injector issue. Hard to tell if it only affects 1%, 5% or more. I suspect the percentage is pretty high because on online forums the problem seems to be common. Given that only a low fraction of BMW owners follow online forums, unless it is a statistical anomaly the HPFP problem is probably not uncommon.

roadrunnerx5
07-10-2011, 04:23 PM
just got a hpfp problem in my '12 x5 35i about 4 months old and 2k miles... GRR

SteVTEC
07-10-2011, 04:36 PM
sorry to hear. :( Just picked up our '11 335 and am hoping it's gonna be ok.

TJPark01
07-10-2011, 06:12 PM
Given the numerous HPFP problems in the N54 (http://en.wikipedia.org/wiki/BMW_N54) Engine (I've had my share

Once bitten twice shy, I can see why you'd be cautious about drinking BMW's turbo Kool-Aide. But reliability is such a crap shoot that there is just no proven way to proactively avoid issues. Women, horses and cars are all the same. You don't know what you have till you strap one on and feel the G's.

roadrunnerx5
07-10-2011, 07:23 PM
Once bitten twice shy, I can see why you'd be cautious about drinking BMW's turbo Kool-Aide. But reliability is such a crap shoot that there is just no proven way to proactively avoid issues. Women, horses and cars are all the same. You don't know what you have till you strap one on and feel the G's.

hahahaha how many G's do you feel when you ride a woman :confused:

mlai
07-10-2011, 09:59 PM
hahahaha how many G's do you feel when you ride a woman :confused:

I was thinking must be 1G max:rofl:

mfeferman
07-09-2013, 11:58 PM
I bought a used 2011 550i with 29k miles in Feb. 2012. Since that time, I've had all of my injectors replaced three times without a fix for the 'extended cranking' issue and now, the last time in, they replaced the low pressure fuel sensor, including some of the feed line. It's still do the same thing and taking more than one crank to start and sometimes the starter stays engaged, after it starts, making a horrible grinding noise... I miss my E39 540i-6 that I had for 12 years. :(

Is this definitely related to the HPFP?