Home > Technical (L322) > Td6 Still Won;t start |
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Mikey Member Since: 10 Jan 2008 Location: Dundee Posts: 1692 |
The injector leak off is tested with the ignition on, not running or cranking, so the above is incorrect You can do a high pressure leak off test, but wouldn't help diagnose a non start issue. |
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13th Oct 2014 5:07pm |
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kingpleb Member Since: 07 Jun 2011 Location: Maybe here. Maybe there, I get everywhere! Posts: 8455 |
I've never done a leak off test on a non running engine...
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13th Oct 2014 5:29pm |
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Mikey Member Since: 10 Jan 2008 Location: Dundee Posts: 1692 |
Looks like I have been doing it wrong for the last 10 years then
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13th Oct 2014 5:56pm |
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kingpleb Member Since: 07 Jun 2011 Location: Maybe here. Maybe there, I get everywhere! Posts: 8455 |
If the ignition is on but the engine is not running then how can there be any decent pressure at the injectors?!
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13th Oct 2014 6:12pm |
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Mikey Member Since: 10 Jan 2008 Location: Dundee Posts: 1692 |
There should be a constant flow of fuel through the HPFP to the fuel rail, from the low pressure feed. Unless there is a fault in the system... |
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13th Oct 2014 7:23pm |
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kingpleb Member Since: 07 Jun 2011 Location: Maybe here. Maybe there, I get everywhere! Posts: 8455 |
The pumps design shouldn't be allowing any fuel to flow past the hpfp at all, it seals as it pumps so unless it's shafted it shouldn't be bleeding any fuel past it.
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13th Oct 2014 7:49pm |
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kingpleb Member Since: 07 Jun 2011 Location: Maybe here. Maybe there, I get everywhere! Posts: 8455 |
This clearly shows my point on the M57 engine.
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13th Oct 2014 7:54pm |
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KurtVerbose Member Since: 08 Aug 2010 Location: Les Arses Posts: 5848 |
Me neither, but here's one on landyzone. |
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13th Oct 2014 8:05pm |
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Mikey Member Since: 10 Jan 2008 Location: Dundee Posts: 1692 |
Lifted from the BMW training manual. Hence why a faulty injector can cause a non start |
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13th Oct 2014 9:01pm |
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kingpleb Member Since: 07 Jun 2011 Location: Maybe here. Maybe there, I get everywhere! Posts: 8455 |
I still can't seenhow the injector can have a supply with out the hpfp supplying pressure unless the hpfp is leaking fluid passed itself somehow. FFRR MY06 facelift With TDV8 Alloys Zeros/ATR's
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13th Oct 2014 9:15pm |
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vaz Member Since: 15 Jun 2014 Location: Colne, Lancashire Posts: 332 |
If you aren't sure about the high pressure supply to the fuel rail being enough, a simple check for you, just to eliminate another possible cause.
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15th Oct 2014 8:51am |
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vaz Member Since: 15 Jun 2014 Location: Colne, Lancashire Posts: 332 |
No, what I meant to say is, that it can stick in place, usually if the pump or engine has been standing for a long while. It would seem to me as though it is a one way valve. Most likely to stop diesel syphoning back to the tank when engine is stopped.
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15th Oct 2014 8:07pm |
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vaz Member Since: 15 Jun 2014 Location: Colne, Lancashire Posts: 332 |
Just checked fuel pressures.
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16th Oct 2014 3:45pm |
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Stuart8185 Member Since: 27 Apr 2015 Location: Edinburgh Posts: 2 |
Hi there I was wondering how you got on.
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28th Apr 2015 8:22pm |
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