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Mk 4 rough starts and lumpy idle PLZ HLP

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  • #1

    Mk 4 rough starts and lumpy idle PLZ HLP

    Car: 1.6L Man

    Problem: 1.Rough start in the morning and lumpy idle- then OK after 5 min

    2.Flat spot in power ( i think its the MAF)

    Apart from Vag Com check, anyone got any suggestions on things i should look at or replace?

    Thanks in advance
    Mick
    Tags: None
  • #2
    Originally posted by mikk@ View Post
    Car: 1.6L Man

    Problem: 1.Rough start in the morning and lumpy idle- then OK after 5 min

    2.Flat spot in power ( i think its the MAF)

    Apart from Vag Com check, anyone got any suggestions on things i should look at or replace?

    Thanks in advance
    Mick
    You may possibly have a air leak. Have a look for any split or broken pipes. Have you done any mods recently?
    Originally posted by Whubbsie
    There is nothing better than a polo badge, thats why you will notice Veyron drivers with polo gti badges.... they know where the true sizzles at!

    Comment

    • #3
      Nah, no mods..
      I got the car with an ABT? air induction kit but pretty standard otherwise..

      Comment

      • #4
        Originally posted by mikk@ View Post
        Nah, no mods..
        I got the car with an ABT? air induction kit but pretty standard otherwise..

        Does that conect after the MAF or before it?

        If it replaced the pipe after the MAF, it may be loose letting un-filtered (and un-meterd) air in. That would give you the symptoms you have now...

        It would be worth while to suss it out.

        Otherwise, disconect the MAF and see if it goes away. If it does you have a MAF that is returning a bad reading.
        Originally posted by Whubbsie
        There is nothing better than a polo badge, thats why you will notice Veyron drivers with polo gti badges.... they know where the true sizzles at!

        Comment

        • #5
          Do a visual for obvious stuff and then you really need to run a scan. Also measured vale blocks - block 03 will check for unmetered air. There is a Vac pipe that comes adrift on the intake elbow near the cyl head and having said that the intake elbows are notorious for splitting and can go unseen unless pressed as it is a concertina, when accelarating the split opens up.
          Good luck
          Jmac
          Alba European
          Service, Diagnostics and repairs. Mobile Diag available on request
          Audi/VW/Porsche Factory trained tech 25+ yrs exp
          For people who value experience call 0423965341

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          • #6
            Here is a pick..

            As it shows, air is first FILTERED then MEASURED before entering the engine and the last time i diconnected the MAF, the car wouldnt start at all.
            Anyone know how effective the eBay cables are for checking faults?
            ALSO, anyone heard the theory that if you change the length of pipe from air flow meter MAF to throttle on a standard car, it could cause problems?
            Cheers
            Last edited by mikk@; 26-05-2008, 12:52 PM.

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            • #7
              Sometimes the coolant temp sensor (G62) can cause this problem on cold start have you had the car scanned?

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              • #8
                Originally posted by Been DUBBED View Post
                Sometimes the coolant temp sensor (G62) can cause this problem on cold start have you had the car scanned?
                Nope.. i thought there might be some obvious things i can check myself before i get it scanned.
                Any1 know of a worshop in Wollongong to perform scan?

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