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Cold morning start problems.

Jonesy Jan 28, 2007

  1. Jonesy

    Jonesy Member

    Hi, recently the car has been acting very strange in the mornings, starting wise its fine it will start as soon as I turn the key and stay running, but every now and then I will start the car and it will sound like the engine is trying to jump out of the engine bay there’s a weird pumping noise that sounds like its struggling to do its job. Plus it idles really bad dipping really low like its about to stall, and I cant drive it either as the gas pedal doesn’t respond properly.

    Thing is I turn it off and back on again and it seems fine. Apart from it seems to be in safety mode not allowing me to rev it high and limiting it to what feels like 100bhp.

    Do you think this is a major problem or just the cold weather not getting on with the car, oh and every now and then the coolant warning pops up, I did top it with water and it came back the other day!!! Maybe I need a new sensor?

    Any advice would be appreciated guys,


  2. LaSarthe&Back

    LaSarthe&Back Member

    Oh dear, sounds like a few problems you got.

    First, have you checked the coolant level? If not, top it up and see if it does it again. The coolant temp sensor can cause a few problems for cold starts. Jerky acceleration, taking about 10 secs to start engine... I would change it anyway.

    How many miles has your car done? Is it chipped? Regular oil changes? Have you had the oil pump changed? Heard a few stories on pumps failing.

    Your poor idling is probably caused buy the good ol trusty MAF!!

  3. TheSpaceCowboy

    TheSpaceCowboy Member

    Also with regards to the idling, check the air filter, I changed out my filter and the car idles a lot less erratic. It was nearly black.
  4. eddyg

    eddyg Member

    All of last winter I had a similar issue on my 2002 S3. From cold it would
    initially start OK, and then the revs would drop, almost stall, and then run rough for ~5secs. Then it would run fine all day.

    Had mechanics try to analyse what it was, couldn't figure it out. Sensors all appeared to be OK. Cost too much to start swapping them all out.

    I worked around the issue by giving it a few revs (~2000rpm) just as I started the car.

    Anyway - my battery died two weeks ago, and so I replaced it. Since
    then it has started perfectly.

    So - either it was because my battery was naf (I noticed that the alarm beep is a lot churpier with the new battery. So maybe the battery has been on the way out for ages). Or possibly more likely the extended period (15mins) with the battery disconnected caused the car to do a full ECU reset which fixed the issue.

    So it's worth disconnecting your battery to see if that helps, and if not
    consider a new battery if it's old anyway.

    Cheers, Ed.
  5. simch

    simch Active Member

    coilpacks and plugs seem likely candidates here, according to our french friends over on S3 Passion!! Symptoms like you describe and apparenly there are updated coilpacks that dealers may fit even outside warranty......??

    When the maf played up on my golf, it just lost some revs and top end, as boost was pulled back after about 4k revs. Sound slike your engine jumpin about could be misfiring....??
  6. Jonesy

    Jonesy Member

    thx for the help guys, ive booked it in for wednesdsay to have a full service, its on 84k at the mo, and is over due a service so gonna get a proper one done.

    bout to go scan car as well, ill post back results in a bit.

  7. Jonesy

    Jonesy Member

    Just scanned and got this

    VAG-COM Version: Release 409.1-S

    Chassis Type: 8P - Audi A3/S3
    Scan: 01,02,03,08,09,15,16,17,19,25,37,42,44,46,47,52,55,56,57,69,75,76,77,7D

    Address 01: Engine
    Controller: 8N0 906 018 ö
    Coding: 10710
    Shop #: WSC 78385
    Note: Excessive Comm Errors

    Address 03: ABS Brakes
    Controller: 8N0 907 379 E
    Component: ESP 20 CAN V005
    Coding: 18448
    Shop #: WSC 06435
    2 Faults Found:
    01423 - Lateral Acceleration Sensor (G200)
    57-10 - Electric Circuit Failure - Intermittent
    01423 - Shareware Version. To Decode all DTCs
    27-10 - Please Register/Activate - Intermittent

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