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E60 (2004 - 2010)
BMW 5-Series (E60 chassis) was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E60 is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

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  #1  
Old 04-23-2013, 09:54 PM
amit1947 amit1947 is offline
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Start Up Hesitation with Video!

Ok so I captured my long start up and hesitation video. This only occurs after letting the car sit for several hours. After starting up, the idle seems smooth. No CEL.

Here's the youtube link:



What could this be?
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  #2  
Old 04-23-2013, 10:04 PM
UltimateDriving UltimateDriving is online now
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I bet it is the fuel pump. Search for BMW HPFP
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  #3  
Old 04-23-2013, 10:18 PM
amit1947 amit1947 is offline
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Yes I know about the HPFP, but it was replaced on this car before I bought it (CPO) last year. And I thought the HPFP issue was "fixed" by now. But who knows, maybe the pump they used is an older revision, I think it was replaced in late 2011.

I am thinking it could be the fuel injectors leaking fuel, while the car sits, or a bad LPFP/sensor, or even carbon build up on the intakes. The car has 46k miles on it and the spark plugs were just replaced at 40k (routine service). All 6 injectors were replaced about 10k miles ago as well.
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Old 04-24-2013, 06:53 AM
l1tech l1tech is offline
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If it is a leaking fuel injector usually the car would act flooded when you try to restart and should stumble a bit when it starts. To me it seems like the fuel pressure is bleeding off. the engine cranks until the fuel pressure comes up and then it starts and all seems well. Possibly a defective check valve in the fuel pump
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  #5  
Old 04-24-2013, 07:18 AM
pcy pcy is offline
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2006 530i does not have HPFP, it has regular fuel pump.
As others suggested, fuel pressure regulator may not be holding the pressure. When was the fuel pump replaced? Did they replace the fuel filter as well at that time?

At 45K miles, with the fuel pump already replaced, now I am not sure if it is fuel pump issue.

Last edited by pcy; 04-24-2013 at 07:21 AM.
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  #6  
Old 04-24-2013, 07:54 AM
amit1947 amit1947 is offline
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My mistake. I havent updated my profile. I have a 2010 535i.
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  #7  
Old 04-24-2013, 12:39 PM
pjinca pjinca is online now
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Have the dealer take a look at the HPFP again and the fuel rail, since those also get clogged and fail.
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  #8  
Old 04-25-2013, 01:46 PM
schpenxel schpenxel is offline
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What sort of fuel pressure is used in direct injection engines?
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  #9  
Old 04-25-2013, 01:50 PM
535kjp 535kjp is offline
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Quote:
Originally Posted by amit1947 View Post
My mistake. I havent updated my profile. I have a 2010 535i.
my 2010 started just like this predominantly on cold starts like overnight. Dealer changed the HPFP and Low Pressure Fuel Sensor and it seems to have remedied the problem for now

Now my problem is misfiring, so I'll probably go back to get the injectors changed. I also realized today that usually when I start the car in the morning, it will start at an initial RPM then about a second or two later raise higher like its getting more power. So it might start at like 900 and raise up to 1200 or so a second or two later

Last edited by 535kjp; 04-25-2013 at 01:55 PM.
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  #10  
Old 04-26-2013, 05:29 PM
amit1947 amit1947 is offline
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I took my car to the dealership this week.

So I got a call from the SA telling me that the long crank was being caused by the HPFP. This was replaced.

I also had a bad "leaking" injector #4 which resulted in all 6 injectors being replaced by the newer "2013" style parts.

Here is the service paperwork:

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  #11  
Old 04-26-2013, 05:32 PM
amit1947 amit1947 is offline
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I am assuming that the pressure test result for the HPFP (5.5 Bars) was the failure?

Does anyone know what the pressure should be?
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