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  1. #1
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    audi 2.5 tdi noisy after pump change

    Hi
    Just changed the diesel injection pump on my 1999 a4 2.5 diesel.
    It sounds like an old tractor.
    Power is well down to what it was.
    Could this be the pump timing out?.
    The pump was running great in the doner car.
    Thank you.
    davek

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  3. #2
    "Stick a V8 in it!"

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    Have you set up the timing using vagcom?

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
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  4. #3
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    Hi
    thanks for your reply.
    I marked the old pully's and used them on the new pump.
    I have vag.com but could not find a how to on pump timing.
    I have adjusted the timing via the cam pully but no change.
    any advice on this would be very welcome.
    So do you think this is my problem.
    The car runs ok but for this damn clacking noise.
    thank you very much.
    davek

  5. #4
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    If you have a 'proper' VCDS, then go to Basic Settings, Block 4 and click the TDi Timing button. With the graph up, choose your engine (bottom on the list for the 2.5TDi) and get it between the lines. The engine will cycle between full advance and retard every 10 seconds, and the line will only be visible during the retard cycle.
    If you have VCDS Lite, or some 'other' copy then TDi Timing doesn't have the 2.5 engine.
    In this case, after starting the car, go to Measuring Blocks, Group 19, and check commencement of injection stored in the memory during start up. It should read between 2.0 ATDC to 4.7 BTDC. Once the engine is running, get it up to a temp of 85C - if you can get it that warm! In Basic setting, go to Group 4 and your timing should read between 0 ATDC and 4 ATDC when the display in zone 2 reads 'retarded', and the injection valve duty cycle should be 100%. When you are in Basic settings Group 4, the engine will cycle between advance and retard every 10 seconds (it starts to 'hunt')
    This method works, but not as accurately as the VCDS method and is complicated
    The Basic settings is important, as in Measured Blocks, the pump ECU will adjust the timing. This means you may have problems with a non-genuine Vag-Com.

    As has been mentioned many times before, you cannot time this pump effectively without the dynamic check, although I adjusted my first one by trial and error, gradually retarding it until most of the 'bark' had gone. When my Ross-Tech lead arrived (less than a week delivered!) I wasn't terribly far out.
    You really do want a genuine VCDS and lead, plus a copy of the Elsa-Win manual system, or similar if you are working on these cars.
    Last edited by PAULF; 28th April 2011 at 11:47. Reason: Group/Block terminology!
    1999 A4 B5 1.9 TDi FWD Saloon, Green SOLD
    2000 A4 B5 2.5 TDi Quattro Avant, Maroon, 'Panzer' Plated (currently sporting wrecked engine - and gearbox )
    2000 A4 B5 2.5 TDi Quattro Saloon, Blue, 'Panzer' Plated, Cruise Control retrofitted, OEM 6 Disc Changer retrofitted
    2006 A6 Allroad 3.0 TDi Blue, awaiting stuff to be done!

  6. #5
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    Hi
    thank you.
    i have a problem.
    group 2 and 19 are not available.
    What version do i need.and can i adjust the timing with vag.com.
    thanks.
    dave

  7. #6
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    You really ought to get the latest version, VCDS 10.6 I think, but it's the real lead you need.
    NMH sells them on this site, or get one from Ross-Tech direct, as I did. The E-Bay leads only work with limited functionality, if at all.
    If you have an E-Bay lead, you can download VCDS Lite from Ross-Tech for free, but you will have to use method 2 to check the timing, which is a bit fiddly.
    VCDS (the new name for Vag-Com) will not adjust your timing. You must check it Dynamically as above, adjust the pulley, then check again. Repeat until it is correct.

    I have made an edit in my previous post far clarity
    1999 A4 B5 1.9 TDi FWD Saloon, Green SOLD
    2000 A4 B5 2.5 TDi Quattro Avant, Maroon, 'Panzer' Plated (currently sporting wrecked engine - and gearbox )
    2000 A4 B5 2.5 TDi Quattro Saloon, Blue, 'Panzer' Plated, Cruise Control retrofitted, OEM 6 Disc Changer retrofitted
    2006 A6 Allroad 3.0 TDi Blue, awaiting stuff to be done!

  8. #7
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    Hi
    I have the real ross tech lead.
    not mine its on load could not afford my own.
    thanks.dave

  9. #8
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    Hi
    thanks for all your help.
    Fiddling with the timing,then all of a sudden a bang then loads of knocking.
    Noticed the timing belt had jumped 2 inches.
    checked belt for missing teeth and for tension but all was perfect.
    all i done before thtis is fit a hand pump for priming.
    never mind.
    thanks.
    dave

 

 

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