flat spots

[GTi-Kid]

hi all, when im drivin along as i get up to about 3000rpm it feels as though there is no power and hn sometimes on an odd accasion the power comes back at about 4000rpm, its a mk3 GTI 8v it has a driled airbox bu was already drilled when i brought the car.
also in 3rd n 4th and the same revs its also as if the revs slow down cos they take quite a while to build up at times.

mny thnaks Dan, 

[tshirt2k]

Check the usual stuff. ecu relay fuel pump relay, vacuum lines and Collant temp sender.

[GTi-Kid]

yep there all gravy my work mate ita use to work at a vw audi specialest and he seems to think that its in need of a tune up, he thinks theres not enought fuel, although runs superb with no air filter and like a peice with a filter, although my suspission are the fuel pump as the car wouldnt start just now for about 40 sec's and i tryed one last time and i flicked on the ignition and after about 2 or 3 seconds after the ignition was on the fuel pump slowely made its little noise. am i on to somethin surely i wont need a tune up at 93k???
cheers for your time guys means a lot! Dan.

[danny_p]

sounds like its out of tune to me

[GTi-Kid]

took it down to be tuned guy said it was the lamba sensor so £60 later replaced it and still no different. i think personally its where the air box has been drilled out and theres more air and not enough fuel

[GTi-Kid]

ok now its had the following done: tune up, checked fuel pressure checked all the valves are ok, checked timing air pipes 2 new lamba sensors, fuel and air mixture. still runs like a sack of ....

yesterday i found that one of the injector plugs was lose (unpluged) reconnected it and went perfectly for 2 minutes then started playin up again. this is really p****ing me off as im tryin to sell the car aswell.

please someone put me out my misery lol cheers dan

[oakgreengolf]

have you changed that ecu relay. mine used to play up around 2500 3000 rpm this was the problem

[GTi-Kid]

ok now it's tryin to stall when it hit's the mark just under 3000pm and does it until it gets to the mark just over 300rpm it throws me back and 4th in my seat not good for a good impression.

[boneybradley]

give the thottle body a really good clean (this will cost a couple of quid but its the best way of making the mk3 run better) and then get it on vag-com and scan for any fault codes, clear them and run for a few days and then scan again and see what shows up (I'm sure someone here will be able to help with the vag-com bit for a few beers  )

[diver705]

Can anybody tel me what ecu relay plays up when care loses power after 3000 rmp please