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engine shuts off in a weird way

Discussion in 'A3/S3/Sportback (8P Chassis)' started by khalil, Jan 17, 2012.

  1. khalil
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    khalil Member

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    [Jan 17, 2012]
    hi all its been a while since i posted,
    i have a little problem with my 2.0 tdi 140, when i switch off the engine it shuts off with a weird noise, before it used to shut off smooth but now it shuts off with a rattle,

    so far had the flywheel and clucth done but that made no difference to that problem,

    any ideas guys?
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  3. Johnny Bravo
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    Johnny Bravo 6+1 Gears

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    [Jan 17, 2012]
    Do you have any error light on?
    This may occur if the cut-off flap is malfunctioning.
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  4. khalil
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    khalil Member

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    [Jan 17, 2012]
    thanks for the reply, no there is no error on the dash,

    or does a tdi shut off that way?
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  5. warren_S5
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    warren_S5 Moderator Staff Member Moderator VCDS Map User

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    [Jan 17, 2012]
    Does the rattle sound metallic?

    Engine mounts or exhaust (heat shield or mounting brackets). Take it no tools have been left anywhere ;-)
    #4
  6. khalil
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    khalil Member

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    [Jan 17, 2012]
    yes mate it does sound metallic,

    you think it can be the "motor intake manifold flap"?
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  7. c_w
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    c_w Active Member

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    [Jan 17, 2012]
    The TDI usually has a rattlesnake noise on shut-down when some kind of solenoid shuts off.
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  8. khalil
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    khalil Member

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    [Jan 17, 2012]
    i am sure when i used to switch it off before it used to be smooth, now when i turn the car off it sound like it cuts off instantly if that makes any sense
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  9. Clover001
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    Clover001 New Member

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    [Jan 18, 2012]
    Alot of the TDI engones make this sort of noise when shut off, if theres no light on the dash i wouldnt of said it was anything serious, u nless it really bothering you, think mine makes a rattling noise when shutting off
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  10. AidenUK
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    AidenUK Well-Known Member

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    [Jan 18, 2012]
    Mine does the same, always has, just had the cam belt changed and it's still there. No warning lights so I'm not bothered really as it would be like searching for a needle in a haystack!
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  11. khalil
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    khalil Member

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    [Jan 18, 2012]
    thanks all, i think its is normal after all, had it checked by a mechanic, say its normal for a diesal
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  12. NHN
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    [Jan 18, 2012]
    So holding clutch in whilst shutting car down doesnt make any difference?

    Also try gradual like pedal held in halfway.

    If its the IMF, then its more than likely the teeth have broken inside if its the older plastic version, which I guess could make a noise if its loose as such & wavering on the motor if that makes sense.
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  13. khalil
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    khalil Member

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    [Jan 18, 2012]
    when i have the clutch down and than switch it off it still the same,

    how would i know if it is the IMF, wouldnt that throw the engine light on the dash?
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  14. NHN
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    [Jan 18, 2012]
    Not neccessarily mate, if its working but missing some teeth then it maybe wont throw a fault as effectively the car still sees a working flap as such, its speculative as we not there to hear the noise.
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  15. khalil
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    khalil Member

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    [Jan 18, 2012]
    if i was to take off the big black hose, would i be able to see if the flap is working?, or would i need to take off the IMF?(believe its held by 3 bolts)
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  16. NHN
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    [Jan 18, 2012]
    I guess you could do this yes mate with a torch momentarily.
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  17. khalil
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    khalil Member

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    [Jan 18, 2012]
    thanks mate, one last thing, the flap it should move smoothly? how would i be able to tell if there is a problem within the flap, ie should i get someone to turn the engine off while i take or look? or is that a no no
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  18. Johnny Bravo
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    Johnny Bravo 6+1 Gears

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    [Jan 20, 2012]
    This would be the best way.
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  19. khalil
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    khalil Member

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    [Jan 20, 2012]
    this morning i undid the black hose, put i mirrror to see is the flap was open or closed, but i found that the flap was open(engine shut), you guys think thats the problem i am having with the wierd cut off?
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  20. khalil
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    khalil Member

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    [Jan 22, 2012]
    just a update,
    i did pull out the black hose, tried to move the flap, which seems stuck, after that put the hose back on and the motor on the IMF made a loud ticking noise when i switched the engine on for few seconds, luckly i have warranty so had it replaced, now it shuts off smooth again,

    thanks to all that help, cheers
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  21. warren_S5
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    warren_S5 Moderator Staff Member Moderator VCDS Map User

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    [Jan 22, 2012]
    Interesting, mine made this ticking on my last S3, must have been this flap.

    Really pleased you've got it sorted khalil.
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  22. NHN
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    [Jan 24, 2012]
    Cool glad to see a successful fix.
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