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X3 E83 (2004 - 2010)
Talk about the E83 BMW X3 in this forum!

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Old 10-10-2010, 05:44 AM
pcolanto pcolanto is offline
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Location: Massachusetts
Join Date: Jul 2010
Posts: 40
Mein Auto: 2011 E90 M3
Residual fuel pressure loss

Hi all,

In starting to diagnose a rough idle issue, I tested the fuel pressure. With the engine running, pressure is spot on spec at 72.5 psi, but ween doing the bleed down test, (no more than 7.2 psi pressure drop after 20 minutes when the engine is turned off), I drop over 10 psi in 5 minutes and it then slowly continues to drop...about 40 psi after 20 minutes.

This explains the long crank after the car has been sitting overnight. I suspect a leaking fuel injector(s) or check valve on the fuel pump. To test this, I need to clamp the fuel line into the fuel rail to isolate injectors vs. check valve. Is it safe to clamp that line? What clamp has anyone used from a parts store? Anyone have this type of issue before and what was the resolution?
2011 E90 M3
2011 X3 28i
2007 X3 3.0si

2008 328xi
2004 325xi
1997 328iS
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Old 10-10-2010, 05:54 AM
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drivinfaster drivinfaster is offline
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Location: in the sticks you piney
Join Date: Nov 2007
Posts: 12,203
Mein Auto: rescued bmw's
i would suspect a faulty fuel pump check valve instead of a leaky fuel injector. here's a link to the type of pliers i used for this sort of test. they come in all sorts of sizes as they can be used for cooling systems as well.


i would pinch off at a rubber hose between the fuel rail and the pump.

good luck.

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Old 12-21-2015, 01:04 PM
DeNERO DeNERO is offline
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Location: Rochester, NY
Join Date: Oct 2015
Posts: 6
Mein Auto: 2006 X3 E83
Hey, i'm having a few issues with my 2006 X3, Got below codes which i understood to be lean conditions.
2883 fuel trim, bank 2
2882 fuel trim, bank 1

So far i've changed the valve cover due to a crack and changed the gasket as well. No vacuum leak with a smoke test at an indy shop and i need to pass inspection so hence the magnitude of my headache.
I also tested/checked the fuel pressure at the fuel rail/schrader valve and got btw 45-50 psi with the engine idle. I do NOT have a rough idle just have the SES (Service Engine Soon) light on.

I appreciate any tips, help and info you can give. Thanks
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