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  1. Low Oil Pressure warning - Intermittent 
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    Hi all, new to the forum although I have been lurking/browsing for a while. I've recently purchased a 2007 Audi A6 avant 2.0 TDI S-Line (BRE) auto.

    I'm getting an intermittent low oil pressure warning alarm. I've read several threads about oil pressure, oil pump, balance shafts etc etc. The reason I've started a new thread here is that my car has had nearly all suggested parts checked, cleaned or replaced under warranty, and the garage are scratching their heads with it now! Looking for some advice or things that I can ask my garage to check. Bear in mind; this car is still under warranty, so anything you suggest to do won't be costing me

    This is the list of work that the car has had done, some was done just before I purchased the car, and the rest has been done in the last couple of weeks.... All info taken from invoice/service sheets from the past few months


    1. Full service
    2. New front tyres
    3. New rear pads and discs
    4. Replaced front velocity joints
    5. Replace rocker cover gasket
    6. Replaced faulty mass flywheel
    7. Cambelt kit and water pump
    8. Replaced cam seals
    9. Investigate engine knock; Replaced number 1 -4 injectors (Edit: Spoke with garage and I think they only replaced 1 injector - bad English on the service sheet!!)
    10. New fuel filter
    11. Oil & filter change
    12. Replaced lambda sensor
    13. Investigate oil pressure fault; Removed cambelt and oil pump
    14. Removed oil sump, inspect and clean sump and pickup strainer (mechanic advised that he cleaned out some oil related pipes/hoses too)
    15. Fit new oil pump and hex shafts
    16. Rebuild engine and tested
    17. Replaced oil pressure switch
    18. Changed oil and filter
    19. Replace/top up fluids
    20. Re-Gas air con, found ac pump faulty
    21. Supply and fit new air con pump


    As you can imagine, after such an extensive list of work, I was fairly confident that all would be good.... But after a 40min drive and I got the oil pressure warning come on three times. I then parked up, came back to the car an hour later and drove it home - no warning lights. I then drove the car for well over an hour & half and the warning light popped up only once!??!

    Other things to note (*might be related*?)... Sometimes (only sometimes) the revs bounce when idling and the engine feels very shaky. On the rev counter the needle bounces between 1 and the marker just below 1. It's as if I'm very gently tapping the accelerator in neutral. The other thing to note is that a friend was following me driving it recently and said "it stinks".... not too helpful, but my in-laws were in their camper behind him and they said that the smell reached their cab - two cars back! He noticed that at the bottom of a long downhill when I put my foot down to go back up the other side that it smoked a bit and smelled quite strong, couldn't describe the smell but the smoke was whiteish with a blue tinge... I've tried looking out for it in the mirrors but can't say I've noticed it, I've definitely noticed a strong smell around the back though.

    I'm taking it back to the garage today who are very apologetic and said they'll be taking me under their wing with this, assuring me that they'll get to the bottom of it. As I said, it's under warranty so not costing me anything yet. I'm after some information/ideas/suggestions of things to tell the mechanic to check, please fire away! My garage is next door to a diesel specialist, so maybe they could assist?

    The car has had so much work done on it, that I'm sure if I can get this oil issue sorted I'd have several years of happy motoring! If I can get it sorted... It's been in the garage for longer than I've owned it now , been with them so long that I'm thinking of asking for a new MOT once it's finished.

    Any help greatly appreciated.
     
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  2. Re: Low Oil Pressure warning - Intermittent 
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    Odd one , but the oil pump drive really needs the re-enginnered modification to eliminate the well known issue.

    Oil Pumps - KMB Parts Direct
     
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  3. Re: Low Oil Pressure warning - Intermittent 
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    Hello, thanks for the response. The well know issue being the balancer shaft issue, yes? They've replaced the oil pump and "hex shafts" already, he said he inspected the balancer shaft assembly and it looks ok... Thought that might protect me from balancer shaft / oil pump failure for a while at least! Doubt that I'd get them to purchase and install what you've linked to under warranty, although something to bear in mind later - thanks.
     
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  4. Re: Low Oil Pressure warning - Intermittent 
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    Sound like a bunch of numpties to me .

    The keyway in the balancer shaft that receives the 77mm hex key is not hexagonal !!

    Furthermore it only has 15mm contact length which adds up to a slack arrangement and not an engineering fit .

    Oem CR 100mm increases the contact length by more than double to 35mm .

    An aftermarket modified remanufactured 100mm balancer shaft kit to 38-40mm with the balancer shaft keyway actually being hexagonal and 10 times harder chrome vanadium .
     
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  5. Re: Low Oil Pressure warning - Intermittent 
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    Just as I was starting to trust them! :\ So you're saying that Kit 9 in that link you sent me; "Kit 9 – KMB9– Audi / VW 2.0tdi Oil Pump Balance Shaft - Gear Driven" - is the right part and should protect me from the known problems related to oil pump/balancer shaft.

    I'll send the link to the garage and see what they say, but is that likely to affect the Oil Pressure warning that I keep getting?
     
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  6. Re: Low Oil Pressure warning - Intermittent 
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    Have you had the oil pressure tested mechanically,and don't jump down my throat but are you sure it's not the oil level alarm.
    A4 B6,A4B7Quattro,MK4 Golf,MK5Golf gone and well forgotten,MK6Golf.
     
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  7. Re: Low Oil Pressure warning - Intermittent 
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    Hello.. yes the oil pressure was tested and he put on the service sheet "found oil pressure drops when engine revving". He then replaced the oil pump etc... however, upon talking to him this morning he didn't test the oil pressure again afterwards...Seems like the logical thing to do right?
    Definitely oil pressure alarm, not oil level!
     
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  8. Re: Low Oil Pressure warning - Intermittent 
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    Ok just a thought about the level,you wouldn't be the first to get them mixed up,anyway first thing first insist on a oil pressure test that will confirm if its low or your new pressure switch,have they actually changed the balance shaft itself or just the hex drive,if its worn inside then its not going to drive the pump.
    A4 B6,A4B7Quattro,MK4 Golf,MK5Golf gone and well forgotten,MK6Golf.
     
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  9. Re: Low Oil Pressure warning - Intermittent 
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    Reading through this it looks like the oil pump and hex key have been changed but only a visual check and 'ok' on the balancer drive bi-hex keyway, it seems like the new key is still slipping in the original bi-hex balancer keyway when the engine is revved and load increases on the oil pump and this worn keyway. As for the poor running and smoke it could be the cam timing needs tweeking since the belt was changed, if they have VCDS they can check the torsion value and idle stabilisation values. that car's had some money spent on it recently.
     
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  10. Re: Low Oil Pressure warning - Intermittent 
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    Well 10 out of ten for doing all that on warranty,hope the auto box doesn't play up or they'll be pulling there hair out not scratching it.
    A4 B6,A4B7Quattro,MK4 Golf,MK5Golf gone and well forgotten,MK6Golf.
     
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