My name is Col and and I've owned a Golf R mk6 DSG for 5 and a bit years. The Golf is my 4 wheel toy and to me it's like a go-kart and on the tight windy back roads, WOW. My other toy is a 1981 Suzuki GS1100E that I've restored, that's a blast for the occasional weekend ride. What I take issue with is incompetence from dealerships who charge you the earth for poor quality work, misdiagnosis and dumb looks. So, I figured with a VCDS in my possession I couldn't be any worse 
It's taken a while, but I finally did it and picked up my Ross-Tech Hex-V2. Great piece of gear to hopefully help with a few issues I've had for awhile. Having used a few other specialized scan tools, I'm surprised how quick it does the scan. Set out below is the Golfs story and i'd love some assistance to figure out the problem.
Golf R Mk6 DSG 60,000kms stock standard as far as I know; only parts changed were recommended to be changed. This problem has been causing me grief for near on 18 months. I have visited the VW dealer and they couldnt or werent interested in helping me out, so I spoke to a number of people who offered opinions, hence the parts replaced.
Using full throttle the engine will reach approximately 3500RPM and stop dead for 1-2 seconds then go again to full RPM.
Light throttle and progressively using more throttle the dead flat spot isnt as pronounced.
When traveling along at say 80kph and lightly accelerating the engine would stumble/misfire then slowly clear and off it would go.
Fuel consumption is shocking, the idle is erratic at times but not always, and mostly its okay.
Parts changed and the result.
Diverter valve: No change and the original one seemed in good condition.
Audi ignition coils: No change.
New spark plugs: New NGK double platinum gaped at .028 this is when the stumble/misfire started. Original VW spark plugs were worn but not stuffed.
New HPFP: New genuine HPFP fitted, checked the camshaft bucket all okay, idle seemed ever so slightly smoother.
New LPFP module: No change.
New BOSCH (Germany) spark plugs: Gaped to .028 no change still the stumble/misfire. Re-gaped the plugs to .026 the stumble/misfire was less evident. Re-gaped to .024 the stumble/misfire was nearly gone. Re-gaped to .022 no stumble or misfire. Re fitted the original coils and NGK spark plugs stumble/misfire back again.
PCV valve inspected and found to be good.
Fuel filter changed a number of times: No change.
Have done a pressure test from the turbo to the throttle body and it held a steady 25psi.
The inlet manifold was inspected for leaks using brake clean while the engine was running; no increase in RPM was found.
Disconnecting the MAF sensor connector causes no idle problems, remove the MAF sensor with the connector fitted (seal the MAF hole in the manifold) and rest the MAF on the engine cover start the engine and no problems, however move the sensor and the engine stops. Checked the MAF wiring, all okay. Connected a DMM to the MAF, had an idle voltage of 2.67 volts, increased the RPM and the voltage reduced to 2.47 volts.
As you can see Ive replaced and tested what I could and this is why I purchased my Ross-Tech HEX-V2, so if there is anyone who could throw some light on the problem, Im all ears.
Thank you and regards Col.
It's taken a while, but I finally did it and picked up my Ross-Tech Hex-V2. Great piece of gear to hopefully help with a few issues I've had for awhile. Having used a few other specialized scan tools, I'm surprised how quick it does the scan. Set out below is the Golfs story and i'd love some assistance to figure out the problem.
Golf R Mk6 DSG 60,000kms stock standard as far as I know; only parts changed were recommended to be changed. This problem has been causing me grief for near on 18 months. I have visited the VW dealer and they couldnt or werent interested in helping me out, so I spoke to a number of people who offered opinions, hence the parts replaced.
Using full throttle the engine will reach approximately 3500RPM and stop dead for 1-2 seconds then go again to full RPM.
Light throttle and progressively using more throttle the dead flat spot isnt as pronounced.
When traveling along at say 80kph and lightly accelerating the engine would stumble/misfire then slowly clear and off it would go.
Fuel consumption is shocking, the idle is erratic at times but not always, and mostly its okay.
Parts changed and the result.
Diverter valve: No change and the original one seemed in good condition.
Audi ignition coils: No change.
New spark plugs: New NGK double platinum gaped at .028 this is when the stumble/misfire started. Original VW spark plugs were worn but not stuffed.
New HPFP: New genuine HPFP fitted, checked the camshaft bucket all okay, idle seemed ever so slightly smoother.
New LPFP module: No change.
New BOSCH (Germany) spark plugs: Gaped to .028 no change still the stumble/misfire. Re-gaped the plugs to .026 the stumble/misfire was less evident. Re-gaped to .024 the stumble/misfire was nearly gone. Re-gaped to .022 no stumble or misfire. Re fitted the original coils and NGK spark plugs stumble/misfire back again.
PCV valve inspected and found to be good.
Fuel filter changed a number of times: No change.
Have done a pressure test from the turbo to the throttle body and it held a steady 25psi.
The inlet manifold was inspected for leaks using brake clean while the engine was running; no increase in RPM was found.
Disconnecting the MAF sensor connector causes no idle problems, remove the MAF sensor with the connector fitted (seal the MAF hole in the manifold) and rest the MAF on the engine cover start the engine and no problems, however move the sensor and the engine stops. Checked the MAF wiring, all okay. Connected a DMM to the MAF, had an idle voltage of 2.67 volts, increased the RPM and the voltage reduced to 2.47 volts.
As you can see Ive replaced and tested what I could and this is why I purchased my Ross-Tech HEX-V2, so if there is anyone who could throw some light on the problem, Im all ears.
Thank you and regards Col.
. The first log to 16 seconds is full throttle in second and third. The next is second, third and fourth. As usual when you try to reproduce a fault nothing really goes wrong. However the car still feels down on power to me.