low pressure feul pump sensor replaced

SouthfloridaE92 · 12-23-2011, 01:42 PM

I had symptoms of a rough idle the rpms would dip below 500 and spike up.. Espicallly at a long red light, and under heavy acceleration the cel or service light would come on and start bucking and shuddering. I told it to BMW they replaced my low pressure fuel pump sensor.. I might be mistaken but i dont think this the real reason why it\'s doing all of this
? I thought it would be coil/injector related possibly hpfp

Brey335i · 12-23-2011, 01:43 PM

Have you gotten the car back yet? Did it fix the problem?

SouthfloridaE92 · 12-23-2011, 01:45 PM

Quote:

Originally Posted by Brey335i

Have you gotten the car back yet? Did it fix the problem?

I just got it back not even a minute ago but I'm going to reinstall my jb4 and then test it, cause when I change maps to a higher boost usually it'd occur easier too

SouthfloridaE92 · 12-23-2011, 05:06 PM

Quote:

Originally Posted by Brey335i

Have you gotten the car back yet? Did it fix the problem?

nope it didn't fix it I put it on map 2 and it happened again but I got videos of it, I'll upload them later and post em here for further info

Blubaron79 · 12-23-2011, 07:59 PM

I had the same problem. They replaced mine too. It half fixed the problem. It happens less frequently. Some one said it might be leaky injectors. When you first start it up, it burns off the fuel that leaked out while sitting overnight. Does yours do it after its warmed up too?

SouthfloridaE92 · 12-23-2011, 10:59 PM

Quote:

Originally Posted by Blubaron79

I had the same problem. They replaced mine too. It half fixed the problem. It happens less frequently. Some one said it might be leaky injectors. When you first start it up, it burns off the fuel that leaked out while sitting overnight. Does yours do it after its warmed up too?

yeah at stop lights sometimes

vase330 · 12-24-2011, 12:45 AM

If its not your HPFP failing, it might also be early stages of LPFP failure symptoms. My pressure sensor and LPFP both failed. LPFP failure is common too, just less common than HPFP failure. The problem with these symptoms is they can be anything in the fuel system or ignition system. Codes for pressure sensor, don't necessarily mean it is the sensor. They test the fuel pressure everything checks out, so they assume your sensor is faulty. Only the spurious low pressure fuel codes are actually being caused by a randomly faltering LPFP.

SouthfloridaE92 · 12-24-2011, 08:41 AM

Also i just has my low pressure pump replaced about a month ago

12-23-2011, 01:42 PM	#1
SouthfloridaE92 Second Lieutenant 14 Rep 252 Posts Drives: 2011 Black e92 335i 6MT Join Date: Aug 2011 Location: Fort lauderdale iTrader: (2)	low pressure feul pump sensor replaced I had symptoms of a rough idle the rpms would dip below 500 and spike up.. Espicallly at a long red light, and under heavy acceleration the cel or service light would come on and start bucking and shuddering. I told it to BMW they replaced my low pressure fuel pump sensor.. I might be mistaken but i dont think this the real reason why it\'s doing all of this ? I thought it would be coil/injector related possibly hpfp
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12-23-2011, 01:43 PM	#2
Brey335i Banned 112 Rep 4,771 Posts Drives: e46 ///M3 Join Date: Oct 2009 Location: Austin, TX iTrader: (11)	Have you gotten the car back yet? Did it fix the problem?
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12-23-2011, 07:59 PM	#5
Blubaron79 Brigadier General 1435 Rep 4,724 Posts Drives: 2021 M340i xDrive Join Date: May 2009 Location: PA iTrader: (0)	I had the same problem. They replaced mine too. It half fixed the problem. It happens less frequently. Some one said it might be leaky injectors. When you first start it up, it burns off the fuel that leaked out while sitting overnight. Does yours do it after its warmed up too? __________________ Current: 2021 M340i xDrive Previous: '18 340i xDrive; '15 335 xDrive; '14 435i xDrive; '09 335 E92 xDrive
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12-24-2011, 12:45 AM	#7
vase330 Colonel 102 Rep 2,760 Posts Drives: 19 E63S; 15.5 RangeRover ATB Join Date: Jan 2007 Location: Arlington, Va iTrader: (1)	If its not your HPFP failing, it might also be early stages of LPFP failure symptoms. My pressure sensor and LPFP both failed. LPFP failure is common too, just less common than HPFP failure. The problem with these symptoms is they can be anything in the fuel system or ignition system. Codes for pressure sensor, don't necessarily mean it is the sensor. They test the fuel pressure everything checks out, so they assume your sensor is faulty. Only the spurious low pressure fuel codes are actually being caused by a randomly faltering LPFP. __________________ E92 335 \| Space Gray \| Saddle Brown Dakota \| Dark Burl Trim \| ZPP \| ZSP \| AT \| Idrive \| 6FL \| FBO \| Dinan CAI \| Quaife LSD \| STG3 PROCede.
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12-24-2011, 08:41 AM	#8
SouthfloridaE92 Second Lieutenant 14 Rep 252 Posts Drives: 2011 Black e92 335i 6MT Join Date: Aug 2011 Location: Fort lauderdale iTrader: (2)	Also i just has my low pressure pump replaced about a month ago
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