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Thread: Golf mk5 2008 diesel cranks but won't start

  1. #31
    NostraJackAss Jack@European_Parts's Avatar
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    Yay!


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  3. #32
    Verified VCDS User Vasco Ferraz's Avatar
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    Jack,

    In my opinion there are 3 types of high pressure diesel pumps:

    - Mechanical diesel pump used on the first diesel vehicles.
    - High pressure pump used on the common rail diesel vehicles.
    - Unit injector (pump duse injector).

    These three types of pumps produce pressures around 1500/2000 bar or even higher.

    This TDI engine produces a pressure of 1900 bar per injector.

    All others a low level pressure pumps that serves to pump fuel work with pressures like 5, 6 ,7, 8... bar. Not 1500 bar.
    Vasco Ferraz

  4. #33
    Verified VCDS User Vasco Ferraz's Avatar
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    ^ So this is why when read/ear high pressure pump it must be one of these 3 types of pumps.

    Pinpointdiag shares my opinion.
    Vasco Ferraz

  5. #34
    Verified VCDS User Vasco Ferraz's Avatar
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    Quote Originally Posted by Pinpointdiag View Post
    I read the SSP years ago when I learned that pd engine did not need a high pressure pump.
    Correct. PD engines have other 2 pumps one on the fuel tank and the tandem pump but none reaches the pressure to ignite diesel.

    This high pressure is achieve at the unit injector which can rise the fuel pressure up to 2000 bar or even higher.
    Vasco Ferraz

  6. #35
    NostraJackAss Jack@European_Parts's Avatar
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    Correct. PD engines have other 2 pumps one on the fuel tank and the tandem pump but none reaches the pressure to ignite diesel.

    This high pressure is achieve at the unit injector which can rise the fuel pressure up to 2000 bar or even higher.
    High pressure atomization is not a contingency of igniting diesel fuel for combustion in a CF engine!


    European Parts Emporium/Performance / Immobilizer Solutions EPE
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  7. #36
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    I’v sat and thought for a wee while. If it’s worth continuing this debate as I’ve never been that fussed about getting that last word in, because there is more to life. But the basics of compression ignition are that the high pressure system has always been there to over come effectively the high combustion chamber pressure at the correct time and with the correct volume of fuel. The device that achieves this will require a suitable low pressure fuel supply.
    Vasco, that’s brilliant that you have got your car going and I’m so sorry if I caused distraction. you are very diplomatic.
    But it doesn’t really matter as jack says. about splitting hairs. He is correct that learning and information is king and I understand he
    wants to help people learn rather than tell them what wrong.
    So as he will always be here to help. Probably best to listen to him.

    Take care everyone.

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  9. #37
    NostraJackAss Jack@European_Parts's Avatar
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    But the basics of compression ignition are that the high pressure system has always been there to over come effectively the high combustion chamber pressure at the correct time and with the correct volume of fuel.
    This is to respond to incorrect information, not to get the last word.

    This statement is incorrect for 2 stroke or 4 stroke.

    Lets focus on the 4 stroke principle & since that is what we play with here.

    When fuel is sprayed in an intake path raw, it will operate a diesel engine ( example starting fluid, gas/diesel & or natural gas ) and is why an engine can runaway on it's own oil example, say if turbo leaks oil into intake and nothing is there to close the air inlet.

    A four stroke compresses the fuel in a four or two stroke and ignites the fuel from heat of compression, the only thing high PSI atomization does is help it burn better.

    In a four stroke it does this better when both valves are closed and at the correct time with high PSI it is not a contingency for combustion to take place.

    Just read about how the diesel generator which ran away from underwater natural gas and blew up the oil platform in the Gulf.
    European Parts Emporium/Performance / Immobilizer Solutions EPE
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    Above Magic! No Written record, AUTO-SCAN or Appointment = NO HELP!
    www.FixMyEuro.com <<<<<CLICK HERE! or vwemporium@aol.com ( JPPSG & Unverified members need not PM me & Please don't email or call facility for free tech support...use the forum )
    Getting you CONTROL again of your property - TAKE IT! In Conjunction with.........

  10. #38
    Ross-Tech Employee Dana's Avatar
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    Hi guys,

    When the OP gets around to pulling the in-tank pump for the level sender repair he might try this after reassembling:

    http://wiki.ross-tech.com/wiki/index...CR_TDI_Engines

    Although it is necessary for CRs, most PDs with electric pumps support BS 035.

    We already know this wasn't a timing problem but in the event you ever need to verify G40 is showing some data MVB 051 can be helpful in a PD:

    051,1,Engine Speed,(G28),Specification (Idle): 770...870 RPM\nSpecification (Full Load): 2800...3200 RPM
    051,2,Camshaft,Speed,Specification: Engine Speed/2 = 50 RPM

  11. #39
    Verified VCDS User Vasco Ferraz's Avatar
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    Thanks Dana
    Vasco Ferraz

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  13. #40
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    I will read now about the gulf rig, was that the BP one. That sounds interesting. Most tech’s will have a memory of when a diesel runs off uncontrollably on its own lubricating oil while sitting on the ramp above you so you can’t even try to stall the thing. Try explaining that to the customer. A compression ignition engine will quite efficiently run on pulverised coal dust or anything else that will burn.

    Vasco may have used diesel starting spray to get the vehicle to run but hair spray or air freshener would even have worked, only If needs must. Anything flammable it’s the control that’s the thing. Easy start is a brand name. But if I remember is Ether. And is almost too strong. Fine for starting an old cement mixer but a little to violent for a modern car. Every week at least one diesel arrives after being at another shop with that unmistakeable smell of easy start and a pile of replaced parts.

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