2.0GTi playing up - hesitant on acceleration/idle

[Archie]

Just started today - when accelerator is depressed, response is hesitant/jerky/non-smooth, not as much power at high revs, and can't get above a certain speed in 4th or 5th. What's the likely cause - MAF, coil pack, TPS/ throttle body?

Possibly related: noticed a rapid clicking noise (increases with engine speed) coming from an unidentified unit mounted on the o/s inner front wing - between the washer reservoir and the header tank - one small vac pipe comes out into the engine (from a Bosch thing), with an electrical connector and another pipe which runs down - is this something to do with emissions control? Should it be clicking?

Many thanks, guys.

[GolfGL]

What car is it? have you got a picture of the area?
Check out the common problems but if its a 1.8t there are quite a few to go through. Most likely maf, ignition parts, o2 sensor, cracked vacuum pipe, coolant temp sensor etc. I dont know bout the clicking so maybe better to get it plugged into a vag com equiped computer and get the codes read.

[Archie]

Now cured. Problem was, as suspected, the air flow sensor. I took it out yesterday and cleaned it - no difference. Was only 85% sure it was this, so got it VAG-com confirmed at the main stealers. Cost - £65 for part, £39.00 for labour (grrr).

[D4veo MK4]

I got the same kind of problem with my 2.0 GTI as well. I was just wondering what yours is like now you have replaced it.

Thanks

[nadlad]

mite be ure variable vane system happens when the waste gate dunt open if it opens u need ure turbo stripping and cleaning

[Archie]

The difference is truly remarkable. The car is now extremely smooth, no hesitations in any gear, and much more responsive to throttle, gear changes, etc. I suspect the sensor was going down hill for quite a while.

The dealer says the AFM can cause a number of running faults.

[nadlad]

u mentioned that u had a noise i think my AFM is gone and i have this whirring noise since then is it similar to ure noise i wonder... my specialist says its gonna cost 400 quid to fix or clean out turbo and wastgate am thinkign i have same symtoms as u shud i try replacign the AFm first