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S3 turning over but not firing

Discussion in 'A3/S3 Forum (8L Chassis)' started by Jonesymk2, Dec 10, 2013.

  1. Jonesymk2
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    Jonesymk2 Member

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    Finally got my s3 running Saturday,took it for a run round the block to clean the brakes up as it had been stood a while,while I was out it popped a boost pipe off,I managed to limp it home an it kept cutting out under strain cause of the pipe being off,I got home and turned the car off and left it till Monday night,I put the hose back on and then the battery was flat so tried jump starting it but nothing,tried again today with a charged battery and still nothing,I plugged the works diagnostic machine in and a few faults showed up so cleared them and still nothing,tried a live data test and it wasn't showing any rpm signal while turning over,I swapped the crank sensor for one that came out of a running car and still nothing,tried yet another sensor which again came out of an engine that I knew was running an still no joy,Ive checked all the fuses and there was only 1 fuse gone in number 7 which is for the reverse lights,I've checked the plugs on the coil packs and got a live and earths to those aswell,checked the engine control relay and that's still working,I'm stumped tbh as can't be the coil packs as they were brand new ones and only got put on the car Saturday,anybody got any other ideas atall please as really getting fed up now
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  2. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator

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  3. Jonesymk2
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    Jonesymk2 Member

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    Sorry forgot to say it's getting fuel as had the plugs out a couple times and they were wet
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  4. Sham101
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    Sham101 Member

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    immoberlized
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  5. Sham101
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    Sham101 Member

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    were are you based?
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  6. Jonesymk2
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    Jonesymk2 Member

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    The ecu I've got has had the immobiliser defeated though,I'm in Luton
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  7. s3dave
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    s3dave TFSI Hybrid

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    Try bumping it? or get someone to tow you, it might be flooded with fuel
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  8. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    You say there were a few fault codes but not posted them... they may have been relevant?

    <tuffty/>
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  9. Jonesymk2
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    Jonesymk2 Member

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    I had the spark plugs out and cleaned them up,one code was for 1 of the knock sensors,one was a crash sensor which is always there for some reason,the other 2 were low voltage which I presumed were from the battery going flat
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  10. Jonesymk2
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    Jonesymk2 Member

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    Is there a relay for the injectors anywhere atall
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  11. Jonesymk2
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    Jonesymk2 Member

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    Got spark and there's fuel getting to the fuel rail but only when the car is turning over,doesn't seem to have much pressure behind it either,is there any way to check the injectors are pulsing atall
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  12. s3dave
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    s3dave TFSI Hybrid

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    Check the voltage while somebody turns it over.. i wonder if the pump is tired?
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  13. 16Klappe
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    16Klappe Princess Slayer

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    Crank sensor.
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  14. s3dave
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    s3dave TFSI Hybrid

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    Usually throws the code Jardo...
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  15. Jonesymk2
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    Jonesymk2 Member

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    I've got spark there so surely if the crank sensor was at fault I wouldn't have spark,will check the pump later when I get home
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  16. s3dave
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    s3dave TFSI Hybrid

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    ^^ Correct^^
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  17. 16Klappe
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    16Klappe Princess Slayer

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    If you unlock the car and open the door can you hear the fuel pump prime.
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  18. Jonesymk2
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    Jonesymk2 Member

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    Do they normally prime when the door is opened then,have never really hear it before so will check when I get home
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  19. 16Klappe
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    16Klappe Princess Slayer

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    Yep.

    If it doesn't prime, check the relay.

    The relays are behind the knee pad, to the right of the steering column. It is the lower right hand relay, marked 409.
    #19
  20. Jonesymk2
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    Jonesymk2 Member

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    Ok cool cheers that was going to be my next question where the relay is lol
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  21. Jonesymk2
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    Jonesymk2 Member

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    [​IMG]These are the relays behind the trim but none marked up 409 :-/
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  22. Jonesymk2
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    Jonesymk2 Member

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    The car is a T plate apy car so not sure if anything will be different
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  23. s3dave
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    s3dave TFSI Hybrid

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    The 167 on your pic should be the fuel relay, not sure if its the wrong relay or not, but it obv has been running...
    #23
  24. rustynlc
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    rustynlc Member

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    I had a fault with my immobiliser kicking in so stopping the engine from starting, chucked it on vagcom and basically turnt out to be a flat battery in the key, not sure if this is the same problem as yours but worked for me,
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  25. Jonesymk2
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    Jonesymk2 Member

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    I've got power to the pump when cranking it over it's showing about 9.5 volts
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  26. Jonesymk2
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    Jonesymk2 Member

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    When cranking should the injectors pulse or have a constant live,also should both sides get power through them as I would have thought one wire should stay as an earth :-/
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  27. Jonesymk2
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    Jonesymk2 Member

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    Well it seems like the pump is knackered,undone the inlet manifold and cranked it over and the 1st spray from the injectors seemed good but each spray after got less and less till no fuel came out so think pump or blocked filter so just going to do both
    #27
  28. John ler
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    John ler Member

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    What was the problem in the end
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