Spluttering over 5000 revs as if not receiving enough fuel. Fault codes listed

[Reeceyy]

Alright guys, my car has just started having this problem where when I am accelerating hard, the car has these spluttering pull backs from around about 5000 rpm to the end of the rev range. Its as if its not receiving the right amount of fuel for the amount of revs that it does. Under 5000 rpm it pulls like a dream, but after 5000rpm it splutters and jumps. It does it in all gears. Its never done this before. I really don't know what the problem is but below is what come up on VCDS. Maybe someone has knowledge of what it could be with these symptoms.

The oil doesn't smell like petrol and the level is fine. I always use RON98. One thing i will mention is that i notice this problem after doing a 800 mile drive.

The car is stage 2 - 289bhp. (It doesn't have the hpfp piston)

Thanks.

[Reeceyy]

These are the fault codes that popped up on vcds:

10 Faults Found:
000665 - Boost Pressure Regulation
               P0299 - 002 - Control Range Not Reached - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 0
                    Fault Frequency: 3
                    Reset counter: 255
                    Mileage: 234556 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 20:45:22

             Freeze Frame:
                    RPM: 5476 /min
                    Load: 90.6 %
                    Speed: 148.0 km/h
                    Temperature: 89.0°C
                    Temperature: 25.0°C
                    Absolute Pres.: 1000.0 mbar
                    Voltage: 13.970 V

000808 - Knock Sensor 1 (G61)
               P0328 - 001 - Signal too High - Intermittent
             Freeze Frame:
                    Fault Status: 00100001
                    Fault Priority: 0
                    Fault Frequency: 7
                    Reset counter: 255
                    Mileage: 234832 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 02:26:03

             Freeze Frame:
                    RPM: 2598 /min
                    Load: 34.9 %
                    Speed: 106.0 km/h
                    Temperature: 91.0°C
                    Temperature: 30.0°C
                    Absolute Pres.: 890.0 mbar
                    Voltage: 14.224 V

000819 - Knock Sensor 2 (G66)
               P0333 - 001 - Signal too High - Intermittent
             Freeze Frame:
                    Fault Status: 00100001
                    Fault Priority: 0
                    Fault Frequency: 14
                    Reset counter: 255
                    Mileage: 234832 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 02:26:03

             Freeze Frame:
                    RPM: 2409 /min
                    Load: 35.3 %
                    Speed: 98.0 km/h
                    Temperature: 92.0°C
                    Temperature: 29.0°C
                    Absolute Pres.: 1000.0 mbar
                    Voltage: 14.224 V

012555 - Low Pressure Fuel regulation
               P310B - 002 - Fuel Pressure Outside Specification - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 0
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 234999 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 04:08:22

             Freeze Frame:
                    RPM: 1962 /min
                    Load: 12.2 %
                    Speed: 39.0 km/h
                    Temperature: 89.0°C
                    Temperature: 61.0°C
                    Absolute Pres.: 940.0 mbar
                    Voltage: 13.589 V

004243 - Bank 1; Fuel Measuring System 2
               P1093 - 008 - Malfunction - Intermittent
             Freeze Frame:
                    Fault Status: 00101000
                    Fault Priority: 0
                    Fault Frequency: 4
                    Reset counter: 255
                    Mileage: 235662 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 04:42:27

             Freeze Frame:
                    RPM: 2375 /min
                    Load: 7.4 %
                    Speed: 48.0 km/h
                    Temperature: 50.0°C
                    Temperature: 36.0°C
                    Absolute Pres.: 930.0 mbar
                    Voltage: 14.351 V

000135 - Fuel Rail/System Pressure
               P0087 - 002 - Too Low - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 0
                    Fault Frequency: 8
                    Reset counter: 255
                    Mileage: 237008 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 20:47:40

             Freeze Frame:
                    RPM: 4147 /min
                    Load: 44.7 %
                    Speed: 141.0 km/h
                    Temperature: 90.0°C
                    Temperature: 25.0°C
                    Absolute Pres.: 1000.0 mbar
                    Voltage: 14.097 V

008759 - Oxygen (Lambda) Sensor B1 S1
               P2237 - 008 - Pump Current Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101000
                    Fault Priority: 0
                    Fault Frequency: 2
                    Reset counter: 255
                    Mileage: 237483 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 19:40:28

             Freeze Frame:
                    RPM: 2167 /min
                    Load: 7.4 %
                    Speed: 44.0 km/h
                    Temperature: 76.0°C
                    Temperature: 27.0°C
                    Absolute Pres.: 1000.0 mbar
                    Voltage: 14.097 V

000768 - Random/Multiple Cylinder Misfire Detected
               P0300 - 001 -
             Freeze Frame:
                    Fault Status: 01100001
                    Fault Priority: 0
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 237634 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 10:00:43

             Freeze Frame:
                    RPM: 6317 /min
                    Load: 80.0 %
                    Speed: 88.0 km/h
                    Temperature: 85.0°C
                    Temperature: 24.0°C
                    Absolute Pres.: 1000.0 mbar
                    Voltage: 13.970 V

000771 - Cylinder 3
               P0303 - 001 - Misfire Detected
             Freeze Frame:
                    Fault Status: 01100001
                    Fault Priority: 0
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 237634 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 10:00:43

             Freeze Frame:
                    RPM: 6317 /min
                    Load: 80.0 %
                    Speed: 88.0 km/h
                    Temperature: 85.0°C
                    Temperature: 24.0°C
                    Absolute Pres.: 1000.0 mbar
                    Voltage: 13.970 V

000772 - Cylinder 4
               P0304 - 001 - Misfire Detected
             Freeze Frame:
                    Fault Status: 01100001
                    Fault Priority: 0
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 237634 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 10:00:43

             Freeze Frame:
                    RPM: 6317 /min
                    Load: 80.0 %
                    Speed: 88.0 km/h
                    Temperature: 85.0°C
                    Temperature: 24.0°C
                    Absolute Pres.: 1000.0 mbar
                    Voltage: 13.970 V

[Reeceyy]

Anyone??

[GVK]

When's the time it had plugs/coil packs... I'd start from there and maybe a fuel pump and check the follower

[lazy]

There's lots of low fuel pressure faults. I would change the fuel filter to start with as it's cheap and easy to do.

[Reeceyy]

Today I've changed the fuel filter, and I took the HPFP off to inspect the cam follower (pic bellow) and the lobe of the camshaft and they are fine!!

I'm running out of ideas now on what this could be.

I've seen a video on YouTube of a Mk6 GTI that somewhat suffered from more o less the same problem and he changed the coils and that fixed the issue. I have also had the engine light flashing when giving it some and and it splutters but now it's permanent on. I really don't know what else this could be. The spark plugs are only 2 months old !

Any ideas??

[lazy]

I'm not an expert on these engines but I would drive it with vcds plugged in and see if it's giving the correct fuel pressure when required. At least you know then whether to be looking at the fuel system or not.

[K03MK5]

Injectors or carbon build up.

[ZoliWorks]

Carbon buildup, dirty injectors, dirty hpfp, dirty fprv, dirty rail pressure regulator, dirty rail/hpfp sensors, failing lpfp. Could be a lot of things These are the thing's I'd check.

I know for a fact that when I had my pump rebuilt, the guy over at Vis told me it was one of the dirtiest pumps he worked with. I'm pretty sure my injectors are partly clogged as well. The FPRV was black on the inside when I changed it for the uprated one.

[Reeceyy]

Ive make a log in vcds. If anyone could give me a bit of feedback from the graph on what the problem could be, id much apprechiate it. Any questions or doubts, let me know to clarify.

[Reeceyy]

Today I changed the spark plugs to the NGK ones that everyone recommends. I had Bosch OEM. They haven't made a difference!

I cleaned the fuel regulator valve which sits on top of the HPFP, again, no difference.

There have been a few things I have noticed today more than before....the car is leting out light black smoke under WOT. When the car idles there is a strong smell of fuel! Also, the car has an intermittent misfire on idle. Whilst misfiring, I connected the car up to vcds and i got a p2279 code come up. (Usually MAF o O2 sensors) I do believe the O2 sensors are faulty because I've had 2 faults come up for the 2 sensors. Usually always the sensor under the car always comes up.

Anyone got any feedback on this or info on that graph I put up yesterday?

[pudding]

The knock sensor and misfire codes are because of lean fuelling.

You have 2 issues. Bad lambda sensor and insufficient fuel flow. B1 S1 is the Pre cat O2 sensor in the downpipe next to the turbo. It is the primary sensor, so is the important one.

The graph doesn't make any sense because the boost and rail pressure specifieds are flat lined.  Fuel pressure actual seems to follow rpm though, but fuel pressure and fuel flow are different things though.  For a remapped engine you need more flow, therefore you need HPFP internals at minimum. If that still doesn't solve the fuelling short fall, then fit a new LPFP.  They get tired with age and were revised by VW twice in the MK5's lifespan.

Put a new genuine O2 sensor and VIS Stage 1 internals in and you should be sorted.

[Reeceyy]

UPDATE for future references: Car is now sorted! I had the lambda (O2) sensor changed and I changed the hpfp piston to a vis one and now the car is back to its good old self. I also changed the cam follower for peace of mind.

I was getting low fuel pressure faults that where setting off other faults. I did however change the spark plugs and the coilpacks and they made no difference, but they're changed and new now so no complaints.

Below are the pics of the old parts I changed.

[K03MK5]

Hi, I have a stage 2+ k04 swap conversion running 345bhp.  They found the inlet manifold runner and inlet valves to be heavily soiled with carbon build (with proof) also expect injectors to be soiled to.  Advised walnut blasting and injectors to be cleaners.  Got a quote £850 all in.