flat spot

[jhono]

help info and ideas needed,i recently got a massive flat spot at around 2500 rpm and only when accelerating in 4th or top gear,vagcom missfire detacted,changed coil packs,no change,checked correct spark plugs fitted 10,000 ago by vw ok,today i have bourght a maf sensor and fitted it huge cost,result it has improved a lot but there is still hesitating under full throttle in 4th 5th and 6th any ideas as i am stumped with this 1

[bacillus]

I would do some live logging with vcds of your actual vs requested fuel rail pressure.
It's block 106

[Saint Steve]

^^^ 2nd that,  low fuel pressures. What stage map are you running if any?

[StuF]

Could it be your high pressure fuel pump? Im sure someone on here with much more knowledge than me will be on soon.
Is your car mapped/modded? Mileage? Age?
Probably need a bit more info

[jhono]

thanks for replys so far,its an 06 plate gti 67,000 full history,fitting the new maf has certainly improved it and most people wouldnt probably no owt was wrong,but haveing had 2 cupra Rs and half a dozen audis and my last 2 cars were a3 sline 170 tdi,and a remamped ibiza cupra deisel,this is my first petrol golf gti,and the car is standard for now anyway,lots of plans in mind but just want to make sure its running rite

[jhono]

ok  just got back from a trip to the new forest i did 870 miles and the engine didnt miss a beat,infact it seems a lot better now i have fitted a new maf returned a healthy 38.5 mpg on many occaisons puzzleling to say the least 

[StuF]

38 mpg - blimey, mine struggles to get 25
Sounds like its better!