1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

A4 2.5 Tdi Quattro - Severe engine knocking and loss of power.

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by richardj, Sep 8, 2012.

  1. richardj
    Offline

    richardj New Member

    Joined:
    Sep 8, 2012
    Messages:
    10
    Likes Received:
    0
    Morning all,

    I'm new to the forum and new to Audi's and I'm sorry that my first proper post is a request for help, but I had some major problems with my car last night....

    3 weeks ago, I purchased a A4 2.5Tdi quattro with 104000 miles on the clock. I decided on this car as I do a lot of motorway miles but also have a need to tow a hefty trailer once in a while. this seemed like the perfect comprimise. Up until yesterday I had done around 2000miles of motorway driving without problem, the engine seemed to be running perfectly fine with no rattles bumps or thuds. It didn't seem to be burning any oil and I was plesently suprised with the MPG I was achieving.

    ....anyway i left work last night and was heading along the A31 for well desrved weekend away in Dorset, unfortunately I never made it. The traffic was heavy and I'd been crawling along for around 10 minutes at start-start pace. I came to a stop on an uphill section and as the traffic started to move away, I pulled off in 1st gear quite sharply, but not floored and there was a big cloud of smoke and the engine was very sluggish. it then started knocking and I managed to crawl into a laybay a few hundred yards down the road.

    The engine slowed to an idle and there was a large, what can only be described as a thumping from the engine that was shaking the whole car...it was almost as if one of the pistons was punching its way out of the engine block, it definately wasn't a rattle like I've heard on broken engines before. Needless to say I turned the car off and called the recovery truck. I checked the oil level and it hadn't moved since I last checked it. I couldn't see any fluids leaking from the car. although the recovery truck was wet when the car came off, I couldn't see anything wet on the undertray, so i'm not sure if this came from my car or someone elses.

    I'm no car expert, but its sounds quite terminal. From my description, does anyone have any suggestions what has actually happened? Is it worth rebuilding or would it be easier to source a replacement engine?....or worse...write the car off? Anyone know of any good mechanics in the Coventry area? I see Lion Garage in Hickley is well respected, but it would be nice if I could find someone local to have a look before I decide what to do.

    I intend to give the trader I bought the car from a call later, but I would like a bit more info before approaching him.

    Thanks,
    Richard
    #1
  2. Ste_Nova
    Offline

    Ste_Nova Active Member

    Joined:
    Apr 20, 2012
    Messages:
    1,225
    Likes Received:
    43
    if no visual faults then its needs a compression check, or a look down the bores with an endoscope
    #2
  3. BlackQuat
    Offline

    BlackQuat Well-Known Member

    Joined:
    Nov 24, 2009
    Messages:
    1,791
    Likes Received:
    43
    I'd be tempted to whip the sump off and check for any rocker arms or peices of metal.
    #3
  4. marktdisport
    Offline

    marktdisport Active Member

    Joined:
    Jul 14, 2011
    Messages:
    1,195
    Likes Received:
    15
    Could it of jumped some teeth on Cambelt.... Just seems strange was ok before sharp pull off...
    #4
  5. murran
    Offline

    murran Active Member

    Joined:
    Aug 10, 2010
    Messages:
    1,540
    Likes Received:
    34
    dropped a valve?
    if you were nearer id come look at it.
    #5
  6. voorhees
    Offline

    voorhees Moderator Staff Member Moderator

    Joined:
    Dec 18, 2005
    Messages:
    15,020
    Likes Received:
    1,146
    I know a mechanic who can have a look and he won't charge the earth,PM me.

    Oh and welcome to Audi ownership btw :icon_thumright:
    #6
  7. quattrojames
    Offline

    quattrojames Moderator Staff Member Moderator

    Joined:
    Mar 28, 2008
    Messages:
    13,885
    Likes Received:
    475
    Mine had exactly the same symptoms as yours had and it had jumped four teeth when the idler pulley disintegrated. Hopefully you'll have more luck though!
    #7
  8. richardj
    Offline

    richardj New Member

    Joined:
    Sep 8, 2012
    Messages:
    10
    Likes Received:
    0
    Thanks for all the feedback, I've spoken with the guy who I bought the car off and so far he sames to be making all the right noises about getting it sorted. Need to get it to a local mechanic to diagnose the exact problem and then take it from there.
    #8
  9. richardj
    Offline

    richardj New Member

    Joined:
    Sep 8, 2012
    Messages:
    10
    Likes Received:
    0
    You have a PM!
    #9
  10. richardj
    Offline

    richardj New Member

    Joined:
    Sep 8, 2012
    Messages:
    10
    Likes Received:
    0
    OK, I have an update. I took it to a local place that deal with VW and Audi cars. There reckon its the camshaft and have quoted more than I've bought the car for to get it replaced...Bizarrely thay didn't open up the engine to give the diagnosis and the high repair price leads me to believe they don't want the work.

    The guy I bought it off is still talking about getting it repaired and he's on about getting someone local to him that he trusts to look at it, but thats 60miles away, so Ideally I'd still ike someone local to me to fix it.

    So without giving me a heart attack, what should I be looking to pay to get the camshafts and associated parts replaced (if it is that whats wrong).
    #10
  11. AlexGSi2000
    Offline

    AlexGSi2000 Well-Known Member

    Joined:
    Feb 14, 2012
    Messages:
    1,191
    Likes Received:
    115
    Unfortunatley this camshaft issue effects quite a few 2.5 engines - I recently had mine replaced by murran.
    I purchased the parts from a german motorfactors on ebay for just over £1100 which included a new timing belt kit.
    (think the camshaft kit only was around £600 if I remember)

    Im surprised they didnt take off one of the rocker covers - it only takes around 15mins for the left side - from there you can see the wear on cams and any dislodged rocker arms.etc

    I was gutted when I found out as its quite an expense!
    #11
  12. murran
    Offline

    murran Active Member

    Joined:
    Aug 10, 2010
    Messages:
    1,540
    Likes Received:
    34
    what youve described in the first post sound very much like a dropped valve to me. if i were looking at it, id remove both both rocker covers to check the valves and valve gear/valves is/are all still intact, before doing anything else.
    if it has dropped a valve id fit a s/h engine.

    i dont see how that garage can quote you anything other than worst case senario without atleast finding out for sure if it has actually dropped a valve.
    #12
  13. murran
    Offline

    murran Active Member

    Joined:
    Aug 10, 2010
    Messages:
    1,540
    Likes Received:
    34
    any joy with this?
    #13
  14. richardj
    Offline

    richardj New Member

    Joined:
    Sep 8, 2012
    Messages:
    10
    Likes Received:
    0
    Morning all, Thanks for all your help with this. The car went car to the trader to get diagnosed.....unfortunately his mechanic has effectively written the engine off, so rather than get it fixed, he is going to refund me in full for the price I paid for the car. He didn;t say exactly what the problem was, but I think its probably the best outcome for me. If it had been repaired I think I would have always been thinking in the back of my mind that it wasn't a reliable car.

    Shortest Audi ownership in history?

    Anyhow, I should get my money back early next week and I'll be on the look out for a new motor. I still facing a A4 quatrro, but not sure if I would look at the 2.5 again...might just be content with a 1.9.
    #14
  15. AlexGSi2000
    Offline

    AlexGSi2000 Well-Known Member

    Joined:
    Feb 14, 2012
    Messages:
    1,191
    Likes Received:
    115
    Thats a shame - at least the good part of it is that the trader have refunded you in full (im sure some traders would try and play it off against the purchaser)

    I think your right in thinking about a 1.9 - not as powerful but probably more reliable.
    #15
  16. murran
    Offline

    murran Active Member

    Joined:
    Aug 10, 2010
    Messages:
    1,540
    Likes Received:
    34
    can you find out what had gone wrong with the engine? id like to know!
    #16
  17. spartacus 68
    Offline

    spartacus 68 Member

    Joined:
    Dec 17, 2008
    Messages:
    261
    Likes Received:
    29
    If your looking for a B6 1.9 TDI quattro - then here's a nice example: Used Audi A4 Estate 1.9 Tdi 130 Quattro Sport 5dr | Culloden Car Sales

    Pretty sure this is the same car I enquired about a few weeks back (was for sale at Autostation, Elgin, now at Culloden Car Sales, Inverness and price has dropped £500. Both dealers failed to forward information to me - so I haven't taken it any further. Distinctive as it has Gmbh bodykit and rear parking sensors.

    Also petrol version: Used Audi A4 Estate 2.0t Fsi Quattro S Line Special Edition 5dr | Auto Station
    #17

Share This Page