G-8VXWWTRHPN Tsi300 misfire - VWWatercooled Australia

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Tsi300 misfire

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  • Tsi300 misfire

    Hey all finding a misfire with my tsi300
    P0300 P0301 and P0303
    Misfires under idle goes away around 2-3k rpm as a starting point I threw a set of plugs at it nothing still misfiring have moved coilpacks around to find that the misfires haven't moved
    Replaced pcv ,next looking at removing intake manifold to inspect for carbon buildup on valves and getting injectors tested anyone offer any advice that has been down this rabbit hole new to the obdeleven
    Last edited by ziggy_jacob; 09-09-2024, 08:20 PM.
    2007 polo gti

    1995 golf mk3 8v

  • #2
    What is the milage on it ziggy?
    Current: 2023 MY23 T-Roc R Lapiz Blue + Beats Audio + Black pack 2018 MY19 Golf R manual Lapiz Blue + DAP) 2018 MY18 Golf 110TSI (150TSI) Trendline manual White2014 Amarok TSI Red (tuned over 200kw + lots of extras) 2013 Up! manual Red 2017 Polo GTI manual Black Previous VWs and some others ...
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    • #3
      Could well be carbon buildup causing those misfires if the car has 100,000+km's on it. You can do a bit of a DIY carbon clean using a spray foam product to see if it improves, but this will only be a temporary fix and you will need to get the intake valves cleaned properly. There is a mechanic in Maitland (Diamond Mechanical) that does a lot of VW and other Euro's.

      There is a temperature sensor on the intake manifold that you can remove easily and then spray the foam cleaner in there to clean some of the gunk off the intake valves.

      LIQUI MOLY Petrol Engine Intake Decarb - 366g | Supercheap Auto
      2017 Ford Fiesta ST the go kart

      2015 Audi SQ5 bi-turbo V6 TDI family hauler

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      • #4
        Just went 110k
        2007 polo gti

        1995 golf mk3 8v

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        • #5
          Cheers for that might try that to see any improvement
          2007 polo gti

          1995 golf mk3 8v

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          • #6
            Oh and it happened all of a sudden that's what makes me suss I need to a compression check
            From my understanding it shouldn't be a vacuum leak because it's not all cylinders missing
            2007 polo gti

            1995 golf mk3 8v

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            • #7
              Well you have done the main culprits already (PCV, coil packs and spark plugs).

              Try a can of that intake cleaner and throw a bottle of injector cleaner in your fuel tank for good measure at the same time. If you get an improvement then you know what the issue is.

              Worse case scenario is timing is out from the timing chain skipping. Lets hope its not that. Are you getting any other error codes other than the misfire codes?
              2017 Ford Fiesta ST the go kart

              2015 Audi SQ5 bi-turbo V6 TDI family hauler

              Comment


              • #8
                Originally posted by Lucas_R View Post
                Well you have done the main culprits already (PCV, coil packs and spark plugs).

                Try a can of that intake cleaner and throw a bottle of injector cleaner in your fuel tank for good measure at the same time. If you get an improvement then you know what the issue is.

                Worse case scenario is timing is out from the timing chain skipping. Lets hope its not that. Are you getting any other error codes other than the misfire codes?
                No other codes that's what annoys me
                2007 polo gti

                1995 golf mk3 8v

                Comment


                • #9
                  Originally posted by ziggy_jacob View Post
                  No other codes that's what annoys me
                  If no other codes then it's a good chance its just carbon buildup causing your issues.
                  Last edited by Lucas_R; 24-09-2024, 12:58 PM.
                  2017 Ford Fiesta ST the go kart

                  2015 Audi SQ5 bi-turbo V6 TDI family hauler

                  Comment


                  • #10
                    Thanks legends so done both treatments has reduced misfires
                    Still getting these codes
                    So assuming it's manifold off time
                    Trouble codes:
                    P050100 - Vehicle Speed Sensor "A" Range/Performance
                    static
                    P030300 - Cyl.3 Misfire Detected
                    static
                    P130A00 - Hide cylinder
                    static
                    P030000 - Random/Multiple Cylinder Misfire Detected
                    static
                    2007 polo gti

                    1995 golf mk3 8v

                    Comment


                    • #11
                      Originally posted by Lucas_R View Post
                      If no other codes then it's a good chance its just carbon buildup causing your issues.
                      Did valve clean this morning Still misfiring after it they did have buildup though
                      Have codes
                      cylinder 3 misfire
                      Hide cylinder
                      Random/multiple misfire detected
                      Fuel too low (fuel light is on)

                      Thinking of getting my hands on a compression tester
                      2007 polo gti

                      1995 golf mk3 8v

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                      • #12
                        Epc light on and engine light flashes when it wants
                        2007 polo gti

                        1995 golf mk3 8v

                        Comment


                        • #13
                          Originally posted by ziggy_jacob View Post
                          Epc light on and engine light flashes when it wants
                          I didn't end up getting the injectors checked really wish I did after I get a compression check done next thing to do

                          I do remember some family telling me the car smelled of petrol after shutting it off and restarting it
                          Possible having a injector stuck open with out codes relating to it?
                          2007 polo gti

                          1995 golf mk3 8v

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                          • #14
                            Sad news peeps after carrying out compression test have concluded cylinder 3 has lost compression
                            Cyl #4-200
                            Cyl #3-25
                            Cyl #2-197.5
                            Cyl #1-195
                            2007 polo gti

                            1995 golf mk3 8v

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                            • #15
                              Ideal oppertunity to do a rebuild. MK6 GTI internals (rods and pistons) will fit, and easily available from ECS Tuning in OEM or upgraded components.

                              This is what I will eventually do to my TSI300 (sorry TSI480)
                              Current: 2023 MY23 T-Roc R Lapiz Blue + Beats Audio + Black pack 2018 MY19 Golf R manual Lapiz Blue + DAP) 2018 MY18 Golf 110TSI (150TSI) Trendline manual White2014 Amarok TSI Red (tuned over 200kw + lots of extras) 2013 Up! manual Red 2017 Polo GTI manual Black Previous VWs and some others ...
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                              Comment

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