Misfires showing up on polar fis

[RoMocop]

I was driving my car today and had the polar menu up with the Misfire parameters from 1-4. I noticed that each time I sat in traffic or stopped at the lights the parameter Misfire 3 goes slowly from 0 to 1, to 2... and sometimes makes its way up to 6 before returning to 0. Then it will slowly creep up again and back to 0 and so on. Only happens when the car is sat at idle but stays on 0 when Im driving. Does anyone have any ideas what is causing this? Dodgey coil pack on cylinder 3?? Car seems ok when driving.

Cheers.

[bacillus]

Try swapping coil pack 3 with coil pack 1 and see what happens to the misfire. If it moves to cylinder 1 then there may be an issue with that coil pack.

fwiw I haven't noticed this happening with my car.

[GrayMK5GTI]

My GTI did the same on cylinder 3. Could have been carbon build up or a dodgy injector. .

I've got a spare injector for a k03 engine. I'm selling it for less than £15 if you whittle it down to that. 

[rich83]

I don't think idle misfires are that uncommon. Ask Alex he knows what the score is.

[ROH ECHT]

I think it is less likely to be all of the coils or plugs fouling at the same time. Multiple randoms are usually valve carbon build-up.
To do some other culprit elimination:
How is your fuel pressures on both the low and high side of the hpfp? [VCDS groups 002, 230, and 231.]

Have you seen my valve cleaning diy? I never have random misfires doing that every 10k miles. I also change my fuel filter every 25k miles and add 12oz of mineral spirits(mineral turpentine I think there) to the tank every 5k miles.

[Saintsteve]

I think it is less likely to be all of the coils or plugs fouling at the same time. Multiple randoms are usually valve carbon build-up.
To do some other culprit elimination:
How is your fuel pressures on both the low and high side of the hpfp? [VCDS groups 002, 230, and 231.]

Have you seen my valve cleaning diy? I never have random misfires doing that every 10k miles. I also change my fuel filter every 25k miles and add 12oz of mineral spirits(mineral turpentine I think there) to the tank every 5k miles.

Perhaps a real exhaust Emmisions check is in order?

[RoMocop]

Thank you for your replies. First thing I will do is try a different coil pack on cylinder 3 and see if that changes anything. Then Ill try and do some logging if I can figure out how. Ive also bought the revised pcv and gasket today so will swap those over. If all else fails I may have to look into the valve cleaning procedure.

Gray- Ill bear that in mind if it does come down to that.

[GrayMK5GTI]

^^ no probs fella 

I'll be at JKM in a few weeks for the RR day anyway 

I also have some inlet cleaning spray which may be worth a try, supposed to dissolve the carbon. Just sprays in the PCV port

[ROH ECHT]

Great if you can log some data b/c so many things can set off misfires, especially the random type. If it stays put that helps narrow the search to either a coil, plug, or injector to look at.

[RoMocop]

Ok dont really know what Im doing but tried to do some logging today. I dont know the best way to post it on here either but hopefully someone can make sense of it or explain to me the best way to do it (I'm on a mac). Sorry!


Group A:   '001            Group B:   '230            Group C:   '231      
      Engine Speed   Coolant   Lambda   Basic Setting      Rail Pressure   Rail Pressure   Rail Pressure          Pressure   Pressure   Load
   TIME      Temperature   Regulator   Requirements   TIME   (specified)   (actual)   Difference      TIME         
Marker   STAMP    /min   °C    %      STAMP    bar    bar    bar      STAMP    bar    bar    %
   0.09   2400   87   4.7   11101001   0   75.59   76.18   -0.59       0.04   5.74   5.65   57.6
   0.23   2480   87   4.3   11101001   0.14   78.16   78.27   -0.11       0.18   5.74   5.72   57.6
   0.37   2520   87   2.3   11101001   0.28   80.62   83.67   -3.05       0.32   5.74   5.72   58.4
   0.53   2560   87   2.3   11101001   0.42   82.99   85.19   -2.2       0.48   5.74   5.72   60
   0.67   2600   87   3.9   11101001   0.57   85.28   87.53   -2.25       0.62   5.74   5.71   60.8
   0.81   2680   87   9.4   11101001   0.71   87.53   89.68   -2.15       0.76   5.74   5.73   62
   0.95   2760   87   12.9   11101001   0.86   89.48   90.53   -1.05       0.9   5.74   5.7   64.7
   1.1   2840   87   16.8   11101001   1.01   90.96   94.01   -3.05       1.06   5.74   5.64   68.2
   1.24   2960   87   17.6   11101001   1.15   91.61   94.16   -2.56       1.2   5.74   5.58   71
   1.38   3040   87   17.6   11101001   1.3   92.11   91.79   0.32       1.34   5.74   5.56   71.8
   1.54   3160   87   16   11101001   1.43   92.62   91.87   0.75       1.48   5.74   5.57   72.5
   1.69   3240   87   13.3   11101001   1.59   93.23   91.93   1.3       1.63   5.74   5.59   73.7
   1.83   3360   87   11.7   11101001   1.73   93.81   93.2   0.61       1.78   5.74   5.59   74.5
   1.97   3440   87   11.7   11101001   1.87   94.42   95.13   -0.71       1.92   5.74   5.61   75.3
   2.12   3600   87   11.7   11101001   2.01   95.06   95.55   -0.5       2.08   5.74   5.65   75.3
   2.26   3680   87   13.3   11101001   2.17   95.83   96.74   -0.91       2.21   5.74   5.69   76.1
   2.4   3800   87   13.7   11101001   2.31   96.55   97.89   -1.35       2.36   5.74   5.69   76.5
   2.54   3880   87   14.1   11101001   2.45   97.29   96.24   1.04       2.5   5.74   5.7   77.3
   2.7   4000   87   13.7   11101001   2.6   98.06   97.72   0.33       2.65   5.74   5.59   78.4
   2.84   4080   87   14.5   11101001   2.74   98.85   98.51   0.34       2.79   5.74   5.52   80.8
   2.98   4160   87   14.5   11101001   2.88   99.66   101.37   -1.71       2.93   5.73   5.49   82
   3.13   4240   87   14.8   11101001   3.02   100.49   101.85   -1.37       3.07   5.73   5.57   82
   3.28   4360   87   15.2   11101001   3.18   101.46   102.56   -1.1       3.22   5.73   5.65   82
   3.41   4440   87   14.8   11101001   3.32   102.34   101.52   0.82       3.37   5.73   5.68   82
   3.56   4520   87   16   11101001   3.46   103.23   105.47   -2.24       3.51   5.73   5.72   82
   3.71   4600   87   19.9   11101001   3.6   104.02   106.75   -2.73       3.66   5.73   5.74   81.6
   3.85   4720   87   25   11101001   3.76   105.09   106.61   -1.53       3.8   5.73   5.78   80.4
   3.99   4800   87   25   11101001   3.9   105.9   109.94   -4.04       3.94   5.73   5.78   81.2
   4.13   4880   87   25   11101001   4.04   106.88   112.19   -5.32       4.08   5.73   5.78   80.8
   4.29   4960   87   25   11101001   4.2   107.86   111.94   -4.08       4.24   5.72   5.8   80.8
   4.43   5080   87   25   11101001   4.33   108.72   111.88   -3.17       4.38   5.72   5.79   80.8
   4.57   5120   87   25   11101001   4.47   109.38   112.67   -3.29       4.52   5.72   5.8   80.4
   4.72   5240   87   25   11101001   4.62   109.67   111.13   -1.47       4.66   5.72   5.79   80
   4.85   5280   87   25   11101001   4.76   109.84   112.79   -2.96       4.81   5.72   5.79   80.4
   4.99   5360   87   25   11101001   4.89   109.91   109.79   0.12       4.94   5.72   5.81   80
   5.13   5440   87   25   11101001   5.03   109.95   108.27   1.68       5.08   5.72   5.82   79.6
   5.29   5520   87   25   11101001   5.18   109.97   111.21   -1.24       5.24   5.72   5.81   79.2
   5.43   5560   87   25   11101001   5.33   109.98   114.41   -4.43       5.38   5.72   5.78   80
   5.57   5640   87   25   11101001   5.48   109.99   111.96   -1.98       5.52   5.68   5.78   79.2
   5.71   5720   87   25   11101001   5.62   109.99   114.41   -4.42       5.66   5.62   5.76   78
   5.86   5800   87   25   11101001   5.77   109.99   114.59   -4.6       5.82   5.57   5.73   76.9
   6   5840   87   25   11101001   5.91   109.99   112.36   -2.37       5.96   5.52   5.72   75.3
   6.14   5920   87   25   11101001   6.05   109.99   113.94   -3.95       6.1   5.47   5.64   75.3
   6.3   6000   87   25   11101001   6.19   109.99   114.44   -4.45       6.24   5.37   5.51   74.1
   6.44   6040   87   23.4   11101001   6.35   109.99   113.48   -3.49       6.4   5.32   5.36   74.9
   6.59   6120   87   14.5   11101001   6.49   109.99   109.57   0.42       6.54   5.28   5.17   75.7
   6.73   6160   87   13.7   11101001   6.64   109.99   128.67   -18.68       6.68   5.25   4.9   78.8
   6.88   6240   87   15.2   11101001   6.77   109.99   93.65   16.34       6.83   5.2   4.91   79.6
   7.02   6280   87   14.5   11101001   6.93   109.99   106.29   3.7       6.97   5.17   4.87   79.2
   7.16   6320   87   14.1   11101001   7.06   109.99   101.52   8.47       7.11   5.15   4.89   79.2
   7.3   6400   87   14.1   11101001   7.21   109.99   105.15   4.84       7.25   5.13   4.89   79.2
   7.46   6440   87   14.1   11101001   7.36   109.99   107.71   2.28       7.41   5.12   4.94   78.4
   7.59   6480   87   13.3   11101001   7.5   109.99   111.23   -1.24       7.55   5.1   4.95   78.4
   7.73   6520   87   12.9   11101001   7.64   109.99   106.42   3.57       7.69   5.1   5.01   78
   7.89   6600   87   11.7   11101001   7.78   109.99   113.68   -3.69       7.83   5.1   5.02   77.3
   8.03   6520   87   3.1   11111001   7.94   109.99   105.54   4.45       7.98   5.08   5.01   77.6

[bacillus]

(I'm on a mac). Sorry!

And so you should be...   

Your LPFP and HPFP are performing up to standard.

Since you're having misfires then I suggest you also log block 015 and 016.

[RoMocop]

Ta da...

[RoMocop]

(I'm on a mac). Sorry!

And so you should be...   

Your LPFP and HPFP are performing up to standard.

Since you're having misfires then I suggest you also log block 015 and 016.

Sorry if you got a headache from those jumble of numbers.

Thank you for reviewing them, so does that mean my APR pump seems to be working ok? I guess the real test would be a stage 2 map where more fuel is requested?

[bacillus]

Your APR hpfp should have no problem even with a stage 2+ map that requests 130 bar.

[RoMocop]

Your APR hpfp should have no problem even with a stage 2+ map that requests 130 bar.

I hope so lol. I bought the pump second hand so always wanted to double check that it's all up to standard.

Re the misfire on idle showing on polar- after doing the logging today (car got a good run) I noticed that no misfires showed up on polar. I wonder if the exhaust etc just needed cleaning out. I will continue to keep an eye on it.