Power all over and now traction control light on! I hate my golf!!!!

[topher]

the hissing noise will be the wastegate venting as your maf is reading high so the ecu "dumps" what it thinks is the extra air/boost in the system. I would assume the jerking is a misfire as the maf signal is sending dodgy readings but not quite exceeding the upper limit that triggers the 16487 code

[Big Tone]

Ahh,

I see, Nice one toph!

[Big Tone]

not good. fitted new maf and hs still the same. pretty sure all boost hs being vented to wastegate. it sounds like a whirlwind under the bonnet. new n75 new maf. where to next?

[topher]

did you clear the codes? might be in limp mode

check there isn't a boost hose popped off too because that can sometimes trick the ecu into thinking the maf is dead

[Big Tone]

I did clear the codes, took her for a spin, same again, less jerky though, more like a smooth hissing/tornado!

Exact same codes came back, but no "17705 - Pressure drop between......." though, just the MAF one!

Will check boost pipes tonight when I am back from work "again" because it does sound like the turbo is producing loads of boost, its just all going to waste.

I will be back.

[Big Tone]

Well, f*ck me, I have found the problem.

The boost gauge which I fitted at the weekend came with its own length of silicon hose. Which at the time I thought,

"thats a bit soft"

When under vacuum the hose collapses in on itself and kinks over, then when on boost the air to the FPR is cut off/restricted massively. It looked like this thing was alive when revving the engine.

Replaced now with some proper stuff so fingers crossed.

(I say fingers crossed cos i haven't actually taken it out yet )

[darren1.8t]

i better check mine m8 lol 

[Big Tone]

Ha ha, also noticed a bit of a boost leak on the charge to pancake pipe, going to ditch the cr*p o ring/c clip arrangement and fit a silicon reducer!