Would my car misfire on cold start if my HPFP was going out.

Jonny550 · 01-24-2011, 12:08 AM

its kind of been driving me crazy on what exactly is wrong with the car at this point. Iam leaving out of town in a couple days and i want to know what the problem before that happens.

I talked to couple a couple people and it seems that the symptoms iam getting are HPFP failure i.e. boost surging, cruising speed limps, etc.

But i have never heard of cold start misfiring with a bad HPFP.

I just had the injectors,plugs,coils replaced so its not the problem.

My question is. Would the car cold start misfire ( repeatedly) with a bad HPFP or would something else cause this problem? i.e. vanos etc?

themyst · 01-24-2011, 12:30 AM

Take it back to the dealer

AlpineG05 · 01-24-2011, 12:38 AM

Injectors or plugs

02themax · 01-24-2011, 11:13 AM

Quote:

Originally Posted by Alpine 335i

Injectors or plugs

Even though you said they were replaced I would have to agree with this. Are you sure all the injectors, plugs and coils got done?

ModBargainsTech · 01-24-2011, 11:22 AM

It could be a fuel pump issue. I would take it back to the dealer and get it checked out.

-Frank

Express · 01-24-2011, 11:23 AM

i feel like your car goes to the dealer more than any car on this forum.

=(

scott135i · 01-24-2011, 12:43 PM

This could be your HPFP.... Sounds similar to the way mine crapped out in my previous N54.

Jonny550 · 01-27-2011, 10:03 AM

Quote:

Originally Posted by express705

i feel like your car goes to the dealer more than any car on this forum.

=(

yep iam enjoying my loaners more then my car....sucks

jpsimon · 01-27-2011, 10:05 AM

When one of my injectors was failing I had misfires on cold start

Jonny550 · 01-27-2011, 10:13 AM

Quote:

Originally Posted by jpsimon

When one of my injectors was failing I had misfires on cold start

well their is a difference between the misfires i had when my injectors were bad and now. Its more of a surging misfire not a shaking misfire.

the needle will just go up and down until i shut it off.

i uninstalled the JB and it seems to have gone away oddly.

01-24-2011, 12:08 AM	#1
Jonny550 Brigadier General 252 Rep 4,936 Posts Drives: 2012 550i Xdrive Join Date: Feb 2009 Location: Jersey Shore iTrader: (14)	Would my car misfire on cold start if my HPFP was going out. its kind of been driving me crazy on what exactly is wrong with the car at this point. Iam leaving out of town in a couple days and i want to know what the problem before that happens. I talked to couple a couple people and it seems that the symptoms iam getting are HPFP failure i.e. boost surging, cruising speed limps, etc. But i have never heard of cold start misfiring with a bad HPFP. I just had the injectors,plugs,coils replaced so its not the problem. My question is. Would the car cold start misfire ( repeatedly) with a bad HPFP or would something else cause this problem? i.e. vanos etc? __________________ [SIGPIC][/SIGPIC] .
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01-24-2011, 12:30 AM	#2
themyst Major General 185 Rep 6,631 Posts Drives: '16 MK7 GTI Join Date: Feb 2009 Location: NYC iTrader: (8)	Take it back to the dealer __________________ E90 LCI N54 6AT
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01-24-2011, 12:38 AM	#3
AlpineG05 hi 190 Rep 1,181 Posts Drives: Alpine White G80 Comp Join Date: Feb 2008 Location: Bakersfield, Cali iTrader: (1)	Injectors or plugs __________________ 2022 M Sport G05 Jb4, CTS catless dp, M performance exhaust, bms intake, IND goodies, Maxton kit
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01-24-2011, 11:22 AM	#5
ModBargainsTech Private 0 Rep 79 Posts Drives: E92 335i/E90 335i/ E82 135i/ Join Date: Jan 2011 Location: La Habra, Ca iTrader: (0)	It could be a fuel pump issue. I would take it back to the dealer and get it checked out. -Frank
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01-24-2011, 11:23 AM	#6
Express Major General 374 Rep 8,688 Posts Drives: 06 330i Join Date: Dec 2008 Location: The Promise Land iTrader: (17) Garage List 2006 BMW 330i [8.30]	i feel like your car goes to the dealer more than any car on this forum. =(
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01-24-2011, 12:43 PM	#7
scott135i Colonel 372 Rep 2,080 Posts Drives: 2020 X5 M50i Join Date: Feb 2009 Location: NYC Metro iTrader: (12)	This could be your HPFP.... Sounds similar to the way mine crapped out in my previous N54.
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01-27-2011, 10:05 AM	#9
jpsimon Team Zissou 3119 Rep 10,199 Posts Drives: 2022 AWD M3 Comp - SMB Join Date: Dec 2006 Location: CT iTrader: (7)	When one of my injectors was failing I had misfires on cold start
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