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ticking at idle,tappets possibly?

Discussion in 'A4/S4 forum(B5 Chassis)' started by pugpete1108, Jun 14, 2009.

  1. pugpete1108
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    pugpete1108 New Member

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    [Jun 14, 2009]
    my 1.8t has developed a ticking at idle which quitens when accelerating but are quieter.

    would an oil flush/change help this? or is it something more serious?

    its due an oil change anyway so is there a reccommended oil to use?

    cheers
    pete
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  3. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Jun 14, 2009]
    I would be tempted to do a good flush with 1/4 diesel. It sounds like you oil pump screen is clogged causing starvation at tick over tbh. Std prob for these cars sadly,
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  4. pugpete1108
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    pugpete1108 New Member

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    [Jun 16, 2009]
    what as in diesel fuel? is that safe?

    is it difficult to just remove the sump and clean it from there?
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  5. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Jun 16, 2009]
    Depends what tool you have access to, as the subframe needs to be removed, or lowered and the engine supported accordingly to access the sump. The job itself is easy once you have access.

    And yes as in diesel fuel, drain off some oil replace with diesel run engine under no load and periodicly rev and hold to 2k revs no more, drop to tick over and repeat for about 10 mins. Drain refil with cheap oil run that through for a few hundred miles, drop that and go full synth. It's a common fix and 85% of the time fixes the problem coupled with regular oil changes afterwards
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  6. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jun 16, 2009]
    i would make two addendums to that:

    1. You can go all the way to using neat diesel instead of oil, and i've done it before with no ill effects, but 50/50 Derv/Oil is probably fine for a starting point. Ideally you want to warm the engine up to operating temperature before draining half the oil out and refilling with derv, its not as effective on a cold engine.

    2. If your engine is ropey, i wouldnt let it idle on the derv/oil mix. The thinner the oil is, the lower your oil pressure will be, and on our engine with its dodgy oil pump the pressure will often drop below 1 bar at idle on a hot day with normal engine oil. With some thin oil because its been thinned down with derv, it might get dangerously low. I would suggest using 1500rpm as a minimum, with short 30sec increases to 2k every few minutes, as that way your likely to ensure the pressure stays above 1bar.
    Also, dont allow the turbo to spool up at all during the flush. I found using a small thin piece of plastic jammed in the throttle linkage moved the butterfly enough to hold a reasonably fast idle.
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  7. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Jun 16, 2009]
    We love our diesel flushes on here,lol
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  8. Lee Goodall
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    Lee Goodall ..got my head together!

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    [Jun 16, 2009]
    I would def do a flush but also check your oil pressure too as it my be a problem with your pump.

    If you're worried about using diesel to flush you can buy flushing oil.. I always use Comma flushing oil which you use neat in the system and run at temperature then drain.
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  9. Lee Goodall
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    Lee Goodall ..got my head together!

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    [Jun 16, 2009]
    #8
  10. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jun 16, 2009]
    Thats what i used when i got the A4, but a couple litres of diesel is cheaper, and its basically the same stuff.
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  11. Lee Goodall
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    Lee Goodall ..got my head together!

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    [Jun 16, 2009]
    True.. but you don't get the flashy green bottle lol
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  12. docurley
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    docurley Moderator Staff Member Moderator

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    [Jun 16, 2009]
    Agreed if you smell these engine flush gear you will not the smell of diesel in them all.
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  13. pugpete1108
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    pugpete1108 New Member

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    [Jun 20, 2009]
    ok cheers will give this a go next week when i'm off.

    what oil is reccomended after using cheap oil ?

    is it a good idea to do the filter too? i guess it is
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  14. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jun 20, 2009]
    Yep change the filter with the oil.

    I just buy a fully synth oil from the factors, whatever their own brand is, comma/granville/carplan/autocare etc and change it regularly.
    #13

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