"sony1492" (sony1492)
03/11/2020 at 19:56 • Filed to: Mini JCW
4
19|
"sony1492" (sony1492)
03/11/2020 at 19:56 • Filed to: Mini JCW | 4
| 19 |
It does technically start and drive but the fuel pressure isnt there and you’ll go into limp mode, unless you dont in which case you’ll be fine. The car was making about 75psi of rail pressure when it should be 750psi at least and closer to 1500psi when driving. Intermittently it would make all 1500 but only if you didnt let it idle too long and it would cut back to 75psi under mid acceleration. Easy fix, sounds like a failing high pressure fuel pump, they go regularly on these cars anyways.
R emove the intake, 3 screws, and disconnect the fuel lines and your good to go.
Ex act same issue with the new pump but now it will make higher pressures when it does decide to work. So one would figure maybe it’s the in tank pump and it dosent supply a steady enough stream of fuel so the computer throws a limp mode. That would explain the fuel pressure dips under acceleration.
The lh assembly is the fuel filter unit that Mini felt was necessary to mount in tank on the opposite side with a seperate removal hatch
I nstalled a new (used) fuel pump and filter. Same exact issues, just now the rail pressure sits around 90-100psi. Went fiddling around after that disappointment and realized disconnecting the hpfp solenoid made absolutely no difference to fuel pressure, so it would seem that the problem has been electrical all along.
P icking up wiring diagrams tomorrow and with some luck I'll find a problem.
The Snowman
> sony1492
03/11/2020 at 20:07 |
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My hpfp got replaced under some factory extended warranty on the part since they new they were an issue and kept using them. What is the part cost on those now days?
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sony1492
> The Snowman
03/11/2020 at 20:13 |
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C hina direct was $140 for what appeared to be a rebuild, autozone will want $500+, and I’m sure bmw will want around $800
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The Snowman
> sony1492
03/11/2020 at 20:16 |
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Wow way better than a few years ago.
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sony1492
> The Snowman
03/11/2020 at 20:20 |
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De mand must be down now that they are entering the scrapyard in force
Deltyn drives a meh car
> sony1492
03/11/2020 at 20:25 |
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Its all good. At least you haven't had to put it into "service configuration"
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sony1492
> Deltyn drives a meh car
03/11/2020 at 20:28 |
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Not officially yet but I think the head rebuild, hg , turbo, and timing chain replacement 1000 miles ago called for it
ItalianJobR53 - now with added 'MERICA and unreliability
> Deltyn drives a meh car
03/11/2020 at 20:36 |
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Its not too bad once you do it a couple of times...
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Deltyn drives a meh car
> sony1492
03/11/2020 at 21:29 |
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I did a head agasket, chain, and guides on an R56 Cooper S about a year ago. It was a learning experience.
FixinRcars
> sony1492
03/12/2020 at 08:09 |
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How are you measuring the high side fuel pressure? Scan tool data? The DME uses a sensor on the high pressure fuel rail. Maybe pressure sensor could be bad. I would also double check your cam. The hpfp is driven by the cam .
Crazylegs
> sony1492
03/12/2020 at 09:29 |
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Please just unplug the rail pressure sensor and see if it will run properly
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sony1492
> Crazylegs
03/12/2020 at 10:58 |
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I will certainly try that, is it a know way to isolate problems with these n14's?
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sony1492
> FixinRcars
03/12/2020 at 11:00 |
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Im using a scantool , the sensor appears to be functional as it fluctuates with throttle inputs and the like, but as someone mentioned above I will check it out.
If the cam was out of wack shouldn't I be getting more serious issues?
PRJCW
> sony1492
03/12/2020 at 15:07 |
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Nwe here so not sure if I am posting correctly. I just went through the same problem and it was the K96 relay on the fuse box.
twojayzeesienna
> sony1492
03/12/2020 at 19:29 |
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lol you think bimmer only wants $800?
Paul
> PRJCW
03/13/2020 at 03:14 |
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My N12 is showing a left fuel sensor fault and I'm having similar symptoms to you. Have you interrogated the car's on board diagnostics? It will give you a fault code and then you'll have to Google the code. That's what led me to my fuel sensor.
Roocifer85
> sony1492
03/13/2020 at 19:59 |
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Try replacing and programming the JBE.
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sony1492
> Paul
03/13/2020 at 20:11 |
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Got codes for an open circuit at the hpfp solenoid, so I'll trace the wires and see if their open. As of today the car dropped a cylinder and threw a few codes for a dead coil so we will see about fixing the original issue after this
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sony1492
> PRJCW
03/13/2020 at 20:13 |
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How did you test the relay? I'm gathering that its internal to the fuse board
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sony1492
> Roocifer85
03/13/2020 at 20:15 |
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Is there any way to test before just throwing parts at it?