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Can anyone help even audi failed

Discussion in 'A3/S3 Forum (8L Chassis)' started by liquids3, Jun 15, 2011.

  1. liquids3
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    liquids3 Member

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    My car has developed a overfueling problem!,over 2,000 revs fine!,under black smoke wrong idle!,it started overfuleing while away in holiday,so found a local audi delership to have a look after i checked most common faults!,they said it was a maf sensor so changed that still the same!,one coil pack looked black so changed that with a set of plugs,still the same,then changed temp sensor ,same!,have cleared fuel rail and fuel return pipe done compresion check!,only thing on diagnostics coming up is cylender 1 and 2!,but surely is due to fueling isue!.the car was mapped one month ago!,only thing i can think is a faulty ecu!,please help i hav spent £550 already!,car is booked back in with tuner race developments for friday!
    #1
  2. s3dave
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    s3dave TFSI Hybrid

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    I would take it back to the Tuner... it could be a big vac leak...
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  3. Alex C
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    Alex C Active Member

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    i would guess at a big vac leak too if the problem is at its worst on idle
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  4. liquids3
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    liquids3 Member

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    Checked all the pipes!,one split one colapsed so changed!,also when you reset coads or take batterey of its fine for ten mins so its chucking fault up again!,cant be mechanical!
    #4
  5. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    could be a sticking injector?
    #5
  6. liquids3
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    liquids3 Member

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    True thats what i thought!,but would it if the prob goes after reseting coads?,then chuck's them up again?
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  7. Welly
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    Welly VX220 SC Driver :)

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    This would be likely.

    You said the only thing coming up on diag is cylinder 1 & 2. What about them?

    Fault codes would be useful.
    #7
  8. liquids3
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    liquids3 Member

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    And did cleen them up!
    #8
  9. Welly
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    Welly VX220 SC Driver :)

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    Hmmmm. Is this where you got it mapped in the first place?
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  10. liquids3
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    liquids3 Member

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    Il try find fault coad
    #10
  11. badger5
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    badger5 RIP S3dave Site Sponsor

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    did this occur immediately after remapping or happened since?

    you drove past my place to get to theirs ;)
    #11
  12. liquids3
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    liquids3 Member

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    No it was about a month afterwords!,plus a map eaither is there or not!,it would reset to standard settings if so!,oh is it yea im only bristol they are **** hot and so freindly up trd!,you'll have to pop up on friday no raceing though lol!
    #12
  13. Alex C
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    Alex C Active Member

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    he did what!! disgracefull lol
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  14. beachbuggy
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    beachbuggy Active Member

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    No ones mentioned it yet, but I'd say a faulty FPR could be the problem. They increase fuel pressure as boost rises, if the FPR is stuck then it could be raising the fuel pressure constantly and not just with boost as it should. Just try a known working one, also this would through up anything in vdcs either so it's more a try and see fix.
    #14
  15. s3dave
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    s3dave TFSI Hybrid

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    Good Shout..^^^
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  16. liquids3
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    liquids3 Member

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    Did cleen it out but if its stuck could be yes!,jst spent to much with trial n error!,il give it ago with a mates s3 worth a go!cheers!
    #16
  17. Welly
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    Welly VX220 SC Driver :)

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    I am keeping well quiet. See no evil, hear no evil, speak no evil.....
    #17
  18. Welly
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    Welly VX220 SC Driver :)

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    I still say some fault codes would be useful...
    #18
  19. 666markyboy
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    666markyboy Active Member

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    try swapping the injectors around , clear the codes and if it comes back on the same cylinders then you know it's not your injectors..... it's something you can try thats not gonna cost you money
    #19
  20. liquids3
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    liquids3 Member

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    Il have to use mates diagnostics to grab fault coads!,but within those cylenders new coils spark plugs and did swap and cleen injectors but not seen where the faught picks up again good point!,il try it and get fault coads!,cars ah like woman one minuite fine then they kick up faults!!
    #20
  21. badger5
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    badger5 RIP S3dave Site Sponsor

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    this thread is useless without actual faultcodes dude
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  22. liquids3
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    liquids3 Member

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    Wel will check all fault coads again tomoz!,but when we first checked them,back though vagcom,it came up with second lamda sensor,because its mapped out!changed for new one anyway,n75 deleat,should kick up fault due to n75 deleat!,and cylender 1,2!
    #22
  23. superkarl
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    superkarl MAN OF STEEL

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    Codes.
    #23
  24. badger5
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    badger5 RIP S3dave Site Sponsor

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    cyl 1 and 2 what???

    jeez your hard work - lol
    #24
  25. Welly
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    Welly VX220 SC Driver :)

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    It's impossible to help you mate as you have given no-one ANY specifics at all. Fault codes are the key to unlocking problems.

    'Cylinder 1 and 2 - intermittent eating toast and marmite for breakfast'?
    #25
  26. 666markyboy
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    666markyboy Active Member

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    "'Cylinder 1 and 2 - intermittent eating toast and marmite for breakfast'? "


    Eeeeewwwww no wonder it's fecked :)
    #26
  27. liquids3
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    liquids3 Member

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    Fault coads. P0300/35/10. P0304/3510. P0302/35/10. P1240/3510. P1602/3510. Any help would be great!, injectors swaped was cylender 1 and 2 now 2 and 4 could injectors be the cause????
    #27
  28. beachbuggy
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    beachbuggy Active Member

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    #28
  29. Welly
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    Welly VX220 SC Driver :)

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    Links for the correct codes:

    16684/P0300/000768 - Ross-Tech Wiki
    16688/P0304/000772 - Ross-Tech Wiki
    16686/P0302/000770 - Ross-Tech Wiki
    17648/P1240 - Ross-Tech Wiki
    18010/P1602/005634 - Ross-Tech Wiki

    The power supply one is where you have disconnected the battery.

    The others look to be injector related. I am guessing that you didn't clear the codes when you swapped the injectors, as that would really have helped diagnose.

    If you have swapped injectors from cylinders 4 and 2 around, then it will be one of those, looking at your codes. It's hard to say which as it retains the previous codes.

    Simple to diag though, if it misfires at idle, simply unplug the harness from those two injectors, and see which one makes no difference to running. That will be the one.
    #29
  30. 666markyboy
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    666markyboy Active Member

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    I still think it's the Marmite :puke2:
    #30
  31. Welly
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    Welly VX220 SC Driver :)

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    Marmite, the well known Octane booster..... lol.
    #31
  32. Dane
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    Dane Faster than a V12 Q7

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  33. Welly
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    Welly VX220 SC Driver :)

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    Ewwwww, wrong un!
    #33
  34. liquids3
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    liquids3 Member

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    I did do that test to determin the coil went in the first place!,just checked again and coil four was gone,which is prob kicking cyl 2 out!,changed coil now drives alot better coil still fine,still black smoke so either need to burn carbon of more or somethink is making the coils go!,or something from what i have changed blew the coil?
    #34
  35. Welly
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    Welly VX220 SC Driver :)

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    I'm sorry, and not wishing to be rude, but what the hell are you talking about?

    You have clearly go an injector issue which I would look to resolve first. Fault codes don't just come up for no reason.

    You have black smoke, a fuelling issue most likely - and a fault on an injector - I'd start there.
    #35
  36. liquids3
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    liquids3 Member

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    True that why i said there must be another cause!,but surely an injector would either work or not work!,i.e blocked!,changed coil and they are now all acting the same!,i don't know im asking?,just sound weird!,has any1 else had this prob?
    #36
  37. Alex C
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    Alex C Active Member

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    i would have thought that if it were coilpacks it would rear its ugly head when the engine is under load....not idle, you say its fine over 2000 rpm...

    people are suggesting injectors and your fault codes are also pointing towards injectors

    you swaped your injectors around and your fault codes jump with them...

    injectors were on cylinders 1&2 and thats where you had fault codes?

    You swap your dodgy injectors to cylinder 3&4 and now you have fault codes across all 4 cylinders.... thats probably because you didnt clear the fault codes from cylinders 1&2 before re-scanning

    injector, injector, injector, injector, injector, injector...so....i changed the coilpack and guess what.....oooh do tell :banghead:
    #37
  38. Welly
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    Welly VX220 SC Driver :)

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    Thanks mate, I'm glad someone else sees it how I do.
    #38
  39. 666markyboy
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    666markyboy Active Member

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    And if it was a sticky injector it could be staying open longer than it should thus over fueling and giving you black smoke
    #39
  40. liquids3
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    liquids3 Member

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    That fair enough im not saying anyones wrong but have been told it could be fuel return pipe ect!,just trying to work it out did'nt think origianly injectors would do that!,does make sence though!,and the coil was'nt sparking on cyl 4!
    #40

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