Help with what feels like a misfire

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • CoupeWannabeS2
    S2Forum Addict
    • Nov 2004
    • 403
    • Country: United Kingdom

    #1

    Help with what feels like a misfire

    Was wondering if anyone could comment on an issue i'm having with my ABY.

    It started to run rough, and felt like it had a misfire. Strangely it made the car sound a bit like a Subaru Impreza - presumably because of the apparent misfire. I limped it home - and noted that it wasn't wanting to accelerate very well at all. Also the engine seemed hotter than normal when I parked it up, and considering I carefully drove it home.


    A few days later I had the chance to pull the fault codes, and had the following:

    00516 - Idle speed switch
    00537 - Lambda sensor control
    01250 - Injector Cyl 2
    01251 - Injector Cyl 3
    01252 - Injector Cyl 4
    01253 - Injector Cyl 5

    I then cleared these codes, then started the car and the engine appeared fine. I took it out for a run to replicate the apparent "misfire fault" and see what the fault codes were at that point.

    After around 10 miles it started the apparent misfire again. The only code I got from the car after this second time the misfire presented was 00537 - Lambda Regulation 08-10 Control Limit Surpassed - intermittent.

    I note that the code 00537 can be due to several things such as:

    -Fuel tank empty at least 10 litres
    -Fuel system pressure too low
    -Failure of spark plugs, ignition coils
    and ignition output stages
    -Ingress of air to G70
    -Leak in exhaust system up to catalyst
    -Faulty lambda probe
    -Fuel system pressure too high

    My first question is do the earlier codes and symptoms described give more of a clue as to what the problem might be?


    I was thinking of disconnecting the Lambda, and then seeing if the fault returns or not. Does that seem sensible?

    My logic being if its a faulty Lambda then I wont get the Misfire back, as the car will be on factory settings. If the fault comes back, then I continue to look for other causes.

    Any comments welcome.
  • freakytate
    S2Forum Addict
    • Jun 2014
    • 206
    • Country: United Kingdom

    #2
    hi, i may stand corrected but if it sounds like a subaru id say it possibly missing on 2 cylinders especially when you say no power at all. im new to the s2 scene but using i think it may point to a pos unit that fires the two?

    my lambda goes intermittent but just idles rough and lower mpg, ive also had idle speed switch fault which gave none of your symptoms

    Comment

    • andyg plym
      S2Forum Freak
      • Nov 2006
      • 4646
      • Country: England

      #3
      Maf sensor is my bet, these faults sound very similar to mine, I replaced the maf even though vag com didn't throw a maf code and it fixed it.

      Was chasing this fault for ages

      Comment

      • rynaqui
        S2Forum Fiend
        • Mar 2012
        • 2752
        • Country: Malta

        #4
        Probably MAF as above, it probably starts to misfire a bit after startup correct?
        1996 S2 ABY Silver

        Comment

        • CoupeWannabeS2
          S2Forum Addict
          • Nov 2004
          • 403
          • Country: United Kingdom

          #5
          Thanks everyone for the input.

          I will focus my attention on the MAF sensor.

          The first time it started the misfire was about 5 minutes after starting the car, and the second time I noticed it about 20 minutes or so later.

          Can you un-plug the MAF and get the car to run with some sort of factory settings? Just thinking to confirm if thats the problem, and so I can use the car for the time being?

          Comment

          • freakytate
            S2Forum Addict
            • Jun 2014
            • 206
            • Country: United Kingdom

            #6
            Can you run with maf unplugged like my golf tdi?

            Comment

            • Error404
              Super Moderator
              • Mar 2007
              • 19789
              • Country: United Kingdom

              #7
              Injector harness wiring would be my first suspect
              Panthero Coupé quattro 20vt
              Indigo ABY coupé
              Imola B6 S4 Avant

              Comment

              • 220bhp
                S2Forum Fiend
                • Nov 2004
                • 2578
                • Home: United Kingdom

                #8
                Dan I have a spare maf you can try.

                Comment

                • CoupeWannabeS2
                  S2Forum Addict
                  • Nov 2004
                  • 403
                  • Country: United Kingdom

                  #9
                  Originally posted by 220bhp
                  Dan I have a spare maf you can try.
                  Hi Lou, that would be great - I will drop you a private message.

                  Comment

                  Working...