Sky InsuranceEM Tuning
Page 1 of 2 12 LastLast
Results 1 to 40 of 68
Like Tree2Likes

Thread: Starting the S3 with low fuel stutters

  1. #1
    1st Gear

    Status
    Offline
    Join Date
    Jun 2009
    Location
    Woking, Surrey
    Posts
    131

    Starting the S3 with low fuel stutters

    Hi guys, so I'm sure this is probably the fuel pump, but thought I'd ask for confirmation.

    When my S3 (AMK) starts from cold, the amount of fuel in the tank dictates how well it starts. With a full tank, it virtually switches on, however with the tank running low (less than a quarter remaining) the car seems to stutter when you first start it. It seems to be fine once it gets going, but I'm guessing this is an early indication that the pump is pretty close to needing replacing? If this is the case, could this be affecting the fuelling all the time as well? Also, how difficult (read: expensive!) is it to replace?

    Ta muchly.
    2001 (Y) Audi S3 AMK | Forge 007p | H&R ARBs | Powerflex Bushes All Round | Badger5 3" TIP & Jetex JR Filter | R-Tech Stage 1 Map | Brembo 4-Pot Callipers (Monoblock from Clio 197) with Ferodo DS2500 & EBC Ultimax Discs | N249 Bypass | Milltek Cat Back Non-Res Special Tips

  2. # ADS
    ADS
    Join Date
    Always
    Location
    Global
    Posts
    Many
     
  3. #2
    <tuffty/>'s Avatar
    Badger 5 Edition

    Status
    Offline
    Join Date
    Sep 2008
    Location
    Gloucestershire
    Posts
    15,016
    Wouldn't have thought its the pump tbh... you could get the pressure checked on a dyno as this would tell you for sure if the pump is getting tired but if the pump struggling on startup you would be having serious running issues under boost etc... it could be the fuel lines de-pressurising over night and its an initial pressure catches it out... but tbh I think its unlikely pump related especially if the engine is running ok was over it and under boost when warm etc..

    Fuel pump failure normally manifests itself as AFR going lean at high rpm under boost as the pressure drops off... seen this on a couple of S3's recently but pretty sure start up was fine...

    Maybe injectors are a little dirty and in need of a clean?

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  4. #3
    1st Gear

    Status
    Offline
    Join Date
    Jun 2009
    Location
    Woking, Surrey
    Posts
    131
    Hmmm, I just find it strange that the amount of fuel in the tank plays such a large part in how well it starts. If it was a drop of pressure in the fuel line, is there a way I can remedy this? I can't imagine the spluttery start is doing the engine much good!

    Can I measure the AFR with VCDS-Lite?

    I've been meaning to clean the injectors soon anyway, just need to find a local sonic bath *nudge nudge* hehe.
    2001 (Y) Audi S3 AMK | Forge 007p | H&R ARBs | Powerflex Bushes All Round | Badger5 3" TIP & Jetex JR Filter | R-Tech Stage 1 Map | Brembo 4-Pot Callipers (Monoblock from Clio 197) with Ferodo DS2500 & EBC Ultimax Discs | N249 Bypass | Milltek Cat Back Non-Res Special Tips

  5. #4
    <tuffty/>'s Avatar
    Badger 5 Edition

    Status
    Offline
    Join Date
    Sep 2008
    Location
    Gloucestershire
    Posts
    15,016
    Fuel pump should prime when you first turn on the ignition, this should re-pressurise the lines... I don't know for sure but there should be a non return valve on the pump but if there isn't or this is getting tired then the pressure differential between the lines and the tanks fuel level could be syphoning back fuel through the lines as the tank level drops and contributing to the effect you are experiencing...

    The block you need for AFR is 031 on VCDS... not sure if the lite version allows that though

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  6. #5
    "Stick a V8 in it!"

    Status
    Offline
    Join Date
    Jan 2008
    Location
    Glenrothes, Fife, Scotland
    Posts
    14,900
    try cycling the ignition twice when the tank is low and see if that helps it start.

    Ie ignition on, wait for the pump to whirr then stop, ignition off and then back on, wait for whirr to stop then start. If it helps, its perhaps suggestive of a faulty non-return valve.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  7. #6
    1st Gear

    Status
    Offline
    Join Date
    Jun 2009
    Location
    Woking, Surrey
    Posts
    131
    I'll give that a go later. If it is the Non-Return Valve, how does one go about replacing it?
    2001 (Y) Audi S3 AMK | Forge 007p | H&R ARBs | Powerflex Bushes All Round | Badger5 3" TIP & Jetex JR Filter | R-Tech Stage 1 Map | Brembo 4-Pot Callipers (Monoblock from Clio 197) with Ferodo DS2500 & EBC Ultimax Discs | N249 Bypass | Milltek Cat Back Non-Res Special Tips

  8. #7
    s3dave's Avatar
    TFSI Hybrid

    Status
    Offline
    Join Date
    Nov 2009
    Location
    west yorks
    Posts
    10,055
    Quote Originally Posted by aragorn View Post
    try cycling the ignition twice when the tank is low and see if that helps it start.

    Ie ignition on, wait for the pump to whirr then stop, ignition off and then back on, wait for whirr to stop then start. If it helps, its perhaps suggestive of a faulty non-return valve.
    Interesting I have had this problem since ive owned the car, and ive done what aragorn as suggested and it works....
    I think mine maybe a little advanced than yours, as my car will not start first time...2nd go no problem everytime.
    Now the interesting thing is im a skinflint (not that) and i start sweating if i put more than £40 in juice at any one time, however last night i put £60 in.........i was talking to somebody.....lol, and low and behold the car started first time this morning......first time ive put £60 in and first time it as started first time ....for me, so you maybe onto something here Hadders...

  9. #8
    jdas03's Avatar
    3rd Gear

    Status
    Offline
    Join Date
    Jun 2009
    Location
    Surrey, UK
    Posts
    597
    I have an AMK and exactly the same issue! Mine takes a while to start from cold with little juice in it, but with a full tank no problem at all! barely needs to turn over! I though fuel pump so i'd be interested to see how this turns out.
    SPEC/DONE:
    Bose, 18" Wheels, Recarro, EBC Turbo Groove discs and Yellow Stuffs pads, TT Pedals, Coilovers, R-Tech Stage 1, Yellow dog bone mount, Powerflex Front ARB Bushes, FK AK Street Coilovers, LCR Front Splitter

    WANTED/TO DO:
    R32 Rear ARB (or uprated ARBs front and back), S3 Armrest, Brembos, FMIC, 3"DP, Cat Back Exhaust

  10. #9
    s3dave's Avatar
    TFSI Hybrid

    Status
    Offline
    Join Date
    Nov 2009
    Location
    west yorks
    Posts
    10,055
    Started again first time lol thats twice since i owned the vehicle , so i will be observing closely at what point it starts deteriorating, (only used about 1L yesterday)
    So its looking like the gravity of the fuel is helping the pump....

  11. #10
    www.badger5.co.uk

    Status
    Online
    Join Date
    May 2004
    Location
    nr Glos
    Posts
    6,935
    I dont recall seeing a non-return valve on the stock pump setup lines.

    Does your pump prime (whirrr click) when you open your drivers door.
    does your pump prime (whirrr click) when you turn ign on (but not crank)

    Does your courtesy light work from the drivers door?
    **http://www.facebook.com/Badger5Ltd**

    Check out the ever Growing eBay Shop>
    http://stores.ebay.co.uk/Badger-5-LTD?_trksid=p4340.l2563

    Badger 5 Ltd, Queen Annes Gate, Oldends Lane, Stonehouse, Glos, GL10 2DG


    http://www.badger5.co.uk, Tel:01453822880
    bill@badger5.co.uk
    **NEW** Badger5 Section CLICK here>> http://www.audi-sport.net/vb/213-badger-5/

  12. #11
    s3dave's Avatar
    TFSI Hybrid

    Status
    Offline
    Join Date
    Nov 2009
    Location
    west yorks
    Posts
    10,055
    Quote Originally Posted by badger5 View Post
    I dont recall seeing a non-return valve on the stock pump setup lines.

    Does your pump prime (whirrr click) when you open your drivers door.
    does your pump prime (whirrr click) when you turn ign on (but not crank)

    Does your courtesy light work from the drivers door?
    On mine i can hear buzzing when the door opens but no click, the interior lights work when the doors open yes

  13. #12
    1st Gear

    Status
    Offline
    Join Date
    Jun 2009
    Location
    Woking, Surrey
    Posts
    131
    Indeed, I tried the two times prime approach and it started fine with a low fuel load.

    I've not noticed mine priming when I open my door, but it definitely primes when I turn on the ignition (without crank). I'll have a listen later when I get back to the car.
    2001 (Y) Audi S3 AMK | Forge 007p | H&R ARBs | Powerflex Bushes All Round | Badger5 3" TIP & Jetex JR Filter | R-Tech Stage 1 Map | Brembo 4-Pot Callipers (Monoblock from Clio 197) with Ferodo DS2500 & EBC Ultimax Discs | N249 Bypass | Milltek Cat Back Non-Res Special Tips

  14. #13
    BENJAMIN's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Mar 2011
    Posts
    459
    Mine does this too. I've fitted a new pump and filter (because it was going lean @5500 rpm upwards) Still takes longer to start and sometimes stutters into life if the fuel gauge is below a quarter. Don't waste your money on a new pump (unless yours is lean anyway) it probably won't fix the poor starting.

  15. #14
    kelk11's Avatar
    1st Gear

    Status
    Offline
    Join Date
    Feb 2009
    Posts
    102
    Mine has also started doing this over the last 2 months when the tank is below a qtr, sometimes on the verge of stalling but fine after around 3 secs of running

  16. #15
    Gops's Avatar
    6th gear @7000rpm

    Status
    Offline
    Join Date
    Nov 2009
    Location
    Coventry
    Posts
    2,504
    Didn't nick have this problem? he changed the temp sender and it was fine? I ordered one of them because i have this problem. I shall see if it cures it, im due to pick it up tomorrow and will fit it too.
    Quote Originally Posted by <tuffty/> View Post
    its either mapped or broken...

  17. #16
    1st Gear

    Status
    Offline
    Join Date
    Jun 2009
    Location
    Woking, Surrey
    Posts
    131
    I've had this problem for quite some time and had the temp sender replaced in that time. And the thermostat.

    This non-return valve sounds like it could be the culprit. Once it gets going it doesn't seem to be a problem, I'm just worried about the long term effects of this on other components.
    2001 (Y) Audi S3 AMK | Forge 007p | H&R ARBs | Powerflex Bushes All Round | Badger5 3" TIP & Jetex JR Filter | R-Tech Stage 1 Map | Brembo 4-Pot Callipers (Monoblock from Clio 197) with Ferodo DS2500 & EBC Ultimax Discs | N249 Bypass | Milltek Cat Back Non-Res Special Tips

  18. #17
    DJ_Troopa's Avatar
    Back in a turbo!

    Status
    Offline
    Join Date
    Oct 2008
    Location
    West London
    Posts
    1,735

    My Social Networking

    Visit DJ_Troopa's Instagram Channel
    I've had this for a while now but it's not the fuel pump as i changed it. Mine's vacuum/boost leak related apparently. But it only happens the next morning on cold starts which i don't understand.

    Inferi Black Cupra K1

  19. #18
    1st Gear

    Status
    Offline
    Join Date
    Jun 2011
    Location
    S.E. Melbourne/ Australia
    Posts
    146
    I would suggest to replace the fpr, discovered that the injector rail loses pressure as soon as the engine is off and that might drain the pressure line through the return line.
    The non return valve is incorporated into the pump.
    2000 Brilliant Black TT Quattro.
    2010 Daytona Grey TTRS.

  20. #19
    www.badger5.co.uk

    Status
    Online
    Join Date
    May 2004
    Location
    nr Glos
    Posts
    6,935
    Quote Originally Posted by Rosso TT View Post
    The non return valve is incorporated into the pump.
    Its on the return line in the pump housings top.. see it now (just tested one here) not on the physical pump at all, but the top cover housing.
    **http://www.facebook.com/Badger5Ltd**

    Check out the ever Growing eBay Shop>
    http://stores.ebay.co.uk/Badger-5-LTD?_trksid=p4340.l2563

    Badger 5 Ltd, Queen Annes Gate, Oldends Lane, Stonehouse, Glos, GL10 2DG


    http://www.badger5.co.uk, Tel:01453822880
    bill@badger5.co.uk
    **NEW** Badger5 Section CLICK here>> http://www.audi-sport.net/vb/213-badger-5/

  21. #20
    s3dave's Avatar
    TFSI Hybrid

    Status
    Offline
    Join Date
    Nov 2009
    Location
    west yorks
    Posts
    10,055
    Easy to test bill?

  22. #21
    1st Gear

    Status
    Offline
    Join Date
    Jun 2011
    Location
    S.E. Melbourne/ Australia
    Posts
    146
    Quote Originally Posted by badger5 View Post
    Its on the return line in the pump housings top.. see it now (just tested one here) not on the physical pump at all, but the top cover housing.
    I'm very comfident there's one too in the pump itself Bill, i dismantled my old pump and saw it, i'll take some pics.
    2000 Brilliant Black TT Quattro.
    2010 Daytona Grey TTRS.

  23. #22
    www.badger5.co.uk

    Status
    Online
    Join Date
    May 2004
    Location
    nr Glos
    Posts
    6,935
    Quote Originally Posted by Rosso TT View Post
    I'm very comfident there's one too in the pump itself Bill, i dismantled my old pump and saw it, i'll take some pics.
    i have pump in parts here.... non-return is in pump head not physical pump on this one
    lcr one here
    **http://www.facebook.com/Badger5Ltd**

    Check out the ever Growing eBay Shop>
    http://stores.ebay.co.uk/Badger-5-LTD?_trksid=p4340.l2563

    Badger 5 Ltd, Queen Annes Gate, Oldends Lane, Stonehouse, Glos, GL10 2DG


    http://www.badger5.co.uk, Tel:01453822880
    bill@badger5.co.uk
    **NEW** Badger5 Section CLICK here>> http://www.audi-sport.net/vb/213-badger-5/

  24. #23
    1st Gear

    Status
    Offline
    Join Date
    Jun 2011
    Location
    S.E. Melbourne/ Australia
    Posts
    146
    2000 Brilliant Black TT Quattro.
    2010 Daytona Grey TTRS.

  25. #24
    www.badger5.co.uk

    Status
    Online
    Join Date
    May 2004
    Location
    nr Glos
    Posts
    6,935
    yes. the pump head, not the pump itself... which is a basic pump
    **http://www.facebook.com/Badger5Ltd**

    Check out the ever Growing eBay Shop>
    http://stores.ebay.co.uk/Badger-5-LTD?_trksid=p4340.l2563

    Badger 5 Ltd, Queen Annes Gate, Oldends Lane, Stonehouse, Glos, GL10 2DG


    http://www.badger5.co.uk, Tel:01453822880
    bill@badger5.co.uk
    **NEW** Badger5 Section CLICK here>> http://www.audi-sport.net/vb/213-badger-5/

  26. #25
    Gops's Avatar
    6th gear @7000rpm

    Status
    Offline
    Join Date
    Nov 2009
    Location
    Coventry
    Posts
    2,504
    Changed temp sensor and cleaned the injectors ultrasonically and it seems to have cured it? Im waiting for a cold morning so i can try it then..
    Quote Originally Posted by <tuffty/> View Post
    its either mapped or broken...

  27. #26
    Gops's Avatar
    6th gear @7000rpm

    Status
    Offline
    Join Date
    Nov 2009
    Location
    Coventry
    Posts
    2,504
    Just thought I update.. I still get bad starts when the fuel is under 1/4 tank. Gonna Change the fuel pump as its 13 years old.
    Quote Originally Posted by <tuffty/> View Post
    its either mapped or broken...

  28. #27
    JD09's Avatar
    I'm not modding, I'm improving

    Status
    Offline
    Join Date
    Dec 2009
    Location
    Cheshire, Alderley Edge
    Posts
    3,078
    Just to add, above quarter tank mine starts every time. Below, it flutters a little, revs and settles. Will try the two turns method! Love AS for this sort of thing.

  29. #28
    Gops's Avatar
    6th gear @7000rpm

    Status
    Offline
    Join Date
    Nov 2009
    Location
    Coventry
    Posts
    2,504
    It does help when you prime the pump twice. But that's what Makes me think its the pump. I'm due to change mine
    Quote Originally Posted by <tuffty/> View Post
    its either mapped or broken...

  30. #29
    vrbob's Avatar
    Thats no Moon, Thats a space station!

    Status
    Offline
    Join Date
    Jun 2007
    Location
    Southampton
    Posts
    2,275
    Quick bump

    Did this ever get resolved? if so what was the cure?

    as my car has been doing this on cold starts for a while now and would like to rectify it if possible.

    I was tempted to try a new CTS although I have scanned the car today and get no faults whatsoever (which is nice)

    Any thoughts?
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
    Mods : Revo Stg 2 & Select+, FMIC, 3" DP & 200 Cell Cat, 007P, Jetex Filter & 80mm TIP & Heatshield, Complete LED Kit, Gen VW Aero Wipers, Full Powerflex Kit, R32 RARB, AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, BB Uprated Actuator,
    N249 Delete & Catch Can, AP TVR 4Pot Brakes & DS2500`s, Sachs Carbon/Kevlar Clutch

  31. #30
    mattyboy199's Avatar
    6th Gear

    Status
    Offline
    Join Date
    Nov 2005
    Location
    UK
    Posts
    1,676
    mine does the same i think its the fuel pump. Only since i read something on here did i take fuel levels into account & under 1/4 tank it does struggle. I initially thought it was to do with the temperture.
    2002 Dolphin grey S3 - Sym2+bose, heated leather, ally mirrors, R32 ARB's with superpro, Jabba stage 2 map, TFSI coils, Samco TIP, Forge DV & privacy glass

    2010 Green Kawasaki Ninja ZX6R - Akrapovic baffleless race can, LED cluster & HID's

    wanted for 8L S3:
    Unmarked grey rear bumper panel
    Milltek system

  32. #31
    s3mad_dude's Avatar
    Noggies ruuuule!

    Status
    Offline
    Join Date
    Jan 2006
    Location
    Hampshire
    Posts
    451
    I replaced my fuel pump when the car failed to start one day (about a year or so ago) but luckily I've not had this problem. So, are you guys definitely sure it's pump related? My pump must've been tired before it stopped working yet I never had any issues with cold starting.

  33. #32
    vrbob's Avatar
    Thats no Moon, Thats a space station!

    Status
    Offline
    Join Date
    Jun 2007
    Location
    Southampton
    Posts
    2,275
    well its not the pump cos I just put a brand new one in 2 days ago yet this issue is still there.
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
    Mods : Revo Stg 2 & Select+, FMIC, 3" DP & 200 Cell Cat, 007P, Jetex Filter & 80mm TIP & Heatshield, Complete LED Kit, Gen VW Aero Wipers, Full Powerflex Kit, R32 RARB, AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, BB Uprated Actuator,
    N249 Delete & Catch Can, AP TVR 4Pot Brakes & DS2500`s, Sachs Carbon/Kevlar Clutch

  34. #33
    1st Gear

    Status
    Online
    Join Date
    Nov 2009
    Location
    Midlands
    Posts
    270
    Mine doesn't prime when you open the door, had it since 2003 and it never has.
    Have you changed the fuel filter?
    I forgot and it ruined the fuel pump
    Dave
    2001 S3 | 210/256/270 switchable APR software | Absolute Red |

  35. #34
    Sam_'s Avatar
    Down under

    Status
    Online
    Join Date
    Mar 2011
    Location
    Sydney, Australia
    Posts
    2,636
    Same issue. It was fine before I done the following:

    - Fuel pump (new VDO/Siemens)
    - Plugs (BKR7Es - properly gapped)
    - Left the car for 3 and a bit weeks

    Sometimes it'll go first time if I turn it over for a bit longer than normal.

    I was planning on cleaning the TB, Injectors and FPR again (I done them around 18 months ago).

    I also have other issues with knock which I think is unrelated (N75 possibly) but I was hoping would be fixed by the pump.
    Handling mods++. GTX30 soon-ish. Hiding parts from the mrs since 2011. Build thread

  36. #35
    vrbob's Avatar
    Thats no Moon, Thats a space station!

    Status
    Offline
    Join Date
    Jun 2007
    Location
    Southampton
    Posts
    2,275
    My car always starts first try everytime but then the revs drop as if its gonna stall like 300-400rpm and then pick up to say 1200 to finally settle just above 1000 whilst the auto choke is running so this is the stutter I am getting

    this whole thing takes no more than 2 or 3 secs and then the car is fine but it never used to do this so it must be a fault somewhere as such. and it only does it when engine is stone cold
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
    Mods : Revo Stg 2 & Select+, FMIC, 3" DP & 200 Cell Cat, 007P, Jetex Filter & 80mm TIP & Heatshield, Complete LED Kit, Gen VW Aero Wipers, Full Powerflex Kit, R32 RARB, AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, BB Uprated Actuator,
    N249 Delete & Catch Can, AP TVR 4Pot Brakes & DS2500`s, Sachs Carbon/Kevlar Clutch

  37. #36
    JD09's Avatar
    I'm not modding, I'm improving

    Status
    Offline
    Join Date
    Dec 2009
    Location
    Cheshire, Alderley Edge
    Posts
    3,078
    If mine is low on fuel, it won't start "nicely" first time, so it'll turn over, turn over, turn over, kick in. Cold temps mean maybe three or four seconds. Warm temps, two seconds.

    Two turns method means it starts instantly every time, regardless of fuel or temp. Not an issue in my mind.

  38. #37
    vrbob's Avatar
    Thats no Moon, Thats a space station!

    Status
    Offline
    Join Date
    Jun 2007
    Location
    Southampton
    Posts
    2,275
    Mine actually died today when I tried to start it and leave it alone started second time but wasn't happy till I gave it a bit of revs above 1000rpm and it was fine.

    So I have an old CTS here from my old S3 which I think is ok so am gonna chuck it in and see if it helps the cold start issue. also popped out the FPR and the little green washer has seen better days so I beefed it up with a second smaller o ring as it may of been losing pressure to the fuel rail.

    For my car its defo something to do with the auto choke not kicking in properly when its stone cold

    Will post back with my results
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
    Mods : Revo Stg 2 & Select+, FMIC, 3" DP & 200 Cell Cat, 007P, Jetex Filter & 80mm TIP & Heatshield, Complete LED Kit, Gen VW Aero Wipers, Full Powerflex Kit, R32 RARB, AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, BB Uprated Actuator,
    N249 Delete & Catch Can, AP TVR 4Pot Brakes & DS2500`s, Sachs Carbon/Kevlar Clutch

  39. #38
    russwuss's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Feb 2013
    Posts
    351
    Quote Originally Posted by vrbob View Post
    Mine actually died today when I tried to start it and leave it alone started second time but wasn't happy till I gave it a bit of revs above 1000rpm and it was fine.

    So I have an old CTS here from my old S3 which I think is ok so am gonna chuck it in and see if it helps the cold start issue. also popped out the FPR and the little green washer has seen better days so I beefed it up with a second smaller o ring as it may of been losing pressure to the fuel rail.

    For my car its defo something to do with the auto choke not kicking in properly when its stone cold

    Will post back with my results
    Very interested to see the results to... mine did this before swapping fuel pump, was OK for a few days after the pump swap (guessing cos ambient temp was higher) and now its back again. I seem to have in my mind I've read about this before and someone said camshaft position sensor cured theirs - or I could be going insane

  40. #39
    sean_s3's Avatar
    1st Gear

    Status
    Offline
    Join Date
    May 2009
    Location
    West Yorkshire
    Posts
    264

    Starting the S3 with low fuel stutters

    Currently battling with this issue. I fitted a new fuel pump a few month back and I also swapped out the cts which did cure it for a while. The cts was an used genuine part I had lying about so it's possible this has gone bad.

    I've decided to leave it for now and wait for it to throw a fault code rather than start replacing bits blindly. It only happens on frosty mornings.
    S3 Big Turbo

  41. #40
    mattyboy199's Avatar
    6th Gear

    Status
    Offline
    Join Date
    Nov 2005
    Location
    UK
    Posts
    1,676
    I'm less than a 1/4 of tank & tonight after it standing since sunday it did struggle however after popping down the gym it didnt struggle at all. I think its time related, if theres no return valve this would make sense.
    2002 Dolphin grey S3 - Sym2+bose, heated leather, ally mirrors, R32 ARB's with superpro, Jabba stage 2 map, TFSI coils, Samco TIP, Forge DV & privacy glass

    2010 Green Kawasaki Ninja ZX6R - Akrapovic baffleless race can, LED cluster & HID's

    wanted for 8L S3:
    Unmarked grey rear bumper panel
    Milltek system

 

 
Page 1 of 2 12 LastLast

Similar Threads

  1. Audi a4 2.0 tdi VERY poor fuel economy (20mpg) and engine starting problems.
    By audi 88 in forum Audi S4/A4/A4 Cab (B8 Chassis)
    Replies: 1
    Last Post: 26th July 2011, 17:00
  2. Audi a4 2.0 tdi VERY poor fuel economy and engine starting problems.
    By audi 88 in forum Audi S4/A4/A4 Cab (B7 Chassis)
    Replies: 2
    Last Post: 26th July 2011, 10:54
  3. A6 Quattro 2.5TDI Starting/Fuel fault
    By The Fiend in forum A6/S6/Allroad forum (C5 Chassis)
    Replies: 0
    Last Post: 27th September 2009, 22:51
  4. fuel stats for a full tank of 97RON fuel in remapped 1.8T Sport...
    By Pete69zx in forum A3/S3 Forum (8L Chassis)
    Replies: 16
    Last Post: 7th January 2007, 14:15
  5. Car intermintantley stutters
    By neversaydie in forum A3/S3 Forum (8L Chassis)
    Replies: 4
    Last Post: 17th December 2004, 13:10

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

Content Relevant URLs by vBSEO