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car turns over but will not start?!

marra_123 May 22, 2012

  1. marra_123

    marra_123 New Member

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    Can anyone please help me? A4 TDI 170 on a 07 plate

    I have an intermittent problem.. I get in the car and the engine turns over and over but will not start?? Ive noticed that when this happens the heater coil light does not come on at all?!
    After a while it can be 2mins to 10 mins of takin key in and out and locking and un locking car, all of a sudden the heater coil light comes back and boom it starts.. also doesnt miss a beat once its started?? its got me beat tho...

    It shows no fault codes either!


    Any help would be appreciated!
     
    Thorsballs likes this.
  2. outsideline

    outsideline Active Member

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    possible cam shaft position sensor, they are well sensative on this engines. although far as im aware they arnt linked to glow plug light???
     
  3. Viking

    Viking Bloody Viking...

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    This issue used to haunt TDIs about 10 years ago. The problem then was the main ecu relay (provides power to the ecu) failed and didn't power up the ecu. A lack of glow plug light was always a giveaway. It was relay 109 which was faulty back then (on the Mk4 Golf platform etc.) but I'm not sure which relay it would be now.
     
  4. marra_123

    marra_123 New Member

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    Thanks for the replys guys! it was fine for about 2 weeks then last night it did it again, so i lifted the bonnet and slapped the top of the ecu and it fired up straight away!!!
    so i think your right its deffo a relay problem or worst case a ecu problem..

    gettin a bit pissed off with it now it seems to be problem after problem, not bad to say i paid 25.5k new for a so called prestige car.....
     
  5. kite

    kite Member VCDS Map User

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    Have you sorted this, A mate has the same problem.
     
  6. Lee Applin

    Lee Applin Guest

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    if its definatlly resolving the issue tapping the ecu you need to get it opened and examined and any dry joints reflowed etc, its not as uncommon as you think, i done a volvo dashboard the other day that had some dry joints

    i use my gas iron on a low setting, it can melt solder ina few secs so i just wave it over most joints chips etc normally resolves it, bit like the old vauxhall edu units.
     
  7. marra_123

    marra_123 New Member

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    its deffo the ecu relay. i even went in behind the fuse panel and wiggled all the relays and its not done it for about a month now.
    just need to find which relay it is cuz audi aint interested in helping me. im still gonna change it, tho im gonna go down to audi so they cant fob me off.
     
  8. Utred

    Utred New Member

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    I'm having the exact same problem as yourself - did you manage to solve the issue in the end?
     
  9. Thorsballs

    Thorsballs New Member

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    Any update on this one?

    My car is a 56 A4 1.9tdi SE and is doing exactly the same thing...intermittent no glow plug light on dash and the car won't start. The only error code is 01314 (no communication). Slapped the plastic cover on the ecu box as the guy said above and it works!!

    Do I change a relay? Which one? I am a total novice by the way.

    Please help, it's seriously doing my head in now! Please!!!!
     
  10. mike81

    mike81 New Member

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    i have an audi a4 tid sline 170 on a 56 plate,had the same problem about a month ago i changed the relay under the ecu under bonnet,was a grey relay think the number was 614 but will check for defo on old 1 tomoz,was a bit fiddley to get the cover off ecu but not to bad.relay cost 26 quid form tps and was a little bigger than original but touch wood since i changed it it been ok,the relay was for fuel pump/main power relay for ecu,hope this helps
     
  11. Thorsballs

    Thorsballs New Member

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    Mike81, thanks very much for you help/ advice. Ill get the relay swapped at the weekend. It's taken months for me to get the right answer to this fault, you wouldn't believe what so called "experts" at a couple of garages wanted to replace to fix this! Hopefully anyone else with the same issue will see this thread and won't have to fork out what I have over the last couple of months. If you can remember the relay number that would be great. Thanks again.
     
  12. gruf

    gruf Member

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    i dont know if this will help but i had a very similar issue with my petrol b5, it was the key reader around the ignition barrel that made the immobiliser not turn off, dont know if this helps but it sounded very much the same
     
  13. kev1973

    kev1973 New Member

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    morning all,

    Ive just signed up as I am having the exact same problem with a 2006 A4 tdi 140. It does it to mine once or twice a month, including today when its snowing heavily.....

    Has anyone got any further info on what this problem could be, ive not yet slapped the ecu, to try that as I had to go to work in MS's car.

    Is the ecu relay 614 and is it worth swapping it.

    Ive had the car towed to a garage but it started first time when it was there.. grrrrr
     
  14. Thorsballs

    Thorsballs New Member

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    I swapped the 614 relay and that fixed the problem. It's never happened since. The replacement relay is slightly larger so don't panic when you see the size difference. A bit awkward to fit as its underneath the ecu. I think it cost me £16 for the relay.

    Forgot to add, you'll notice the pins on the old relay are burnt. I gather it was a design fault hence the replacement is larger.
     
  15. kev1973

    kev1973 New Member

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    thanks for the reply, ive ordered one that isbeing delivered tomorrow, when i got home tonight, it would still not start, i popped the bottom and tapped the ecu case a few times with my keys, and it started up first time. Maybe there is a loose relay somewhere inside but with 7" of snow on the ground and having ordered the part (15 pounds) ill just swap it.
     
  16. Darren Pountney

    Darren Pountney New Member

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    Just had this happen on my 05 sline diesel and replaced all 4 glow plugs. Work intermittent and then failed again tonight. A A not sure what problem is but I'm pinning my hopes on the new relay 614 which arrives Tuesday. Fingers crossed and any help appreciated please
     
  17. Darren Pountney

    Darren Pountney New Member

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    Did it get sorted with 614 replacement?
     
  18. kev1973

    kev1973 New Member

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    Yes, it did it's been fine since, a cheap fix for a change, there is another thread on the subject, but I'd just swap it anyway
     
  19. Darren Pountney

    Darren Pountney New Member

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    Yes on order for delivery Tuesday, fingers crossed this does the trick as really uncomfortable using the car at moment. Seems to only do it when Car us warm as well as turned over find first thing last two mornings.
     
  20. kev1973

    kev1973 New Member

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    Hope it sorts it, in the meantime tapping the box that holds the relay got mine started a couple of times when it was playing up.
     
    Last edited: May 24, 2015
  21. Darren Pountney

    Darren Pountney New Member

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    Holds the fuse or relay?

    I'll try latEr as a a man did try thus Saturday no luck,

    Then Sunday morning bang starts first time,

    Frustrating, com
     
  22. kev1973

    kev1973 New Member

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    Apologies, I meant the relay in the scuttle panel.. I know what you mean, I got the aa out and it started first time when he tried it!
     
  23. Darren Pountney

    Darren Pountney New Member

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    Had the relay out several times saturday night

    Cleaned it it looks ok but as seem to think it has every chance of being faulty.

    So hope it gets the job done as car has been a beauty,..

    Daz
     
  24. Darren Pountney

    Darren Pountney New Member

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    Well changed the relay 614 - upgraded now to a 644 by Audi as been superseded.
    Still get the intermittent glow plug light issue but pop the bonnet and tap the ecu and I usually get her started.
    Not sure where to go now :(
    Daz
     

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