I've got a power loss at < 2500 rpm and a judder on turn off so after reading plenty of posts I set about it this weekend. First off I cleaned the EGR valve which you cant go wrong with the guide on here, then I cleaned the intake body where the butterfly valve is. All staight forward.
Next up was cleaning the MAF sensor. Plenty of posts just say disconnect it to see how it runs. No-one seems to point out that the MAF and therefore electrical connection is located directly under the battery tray! So only I could figure to access was take the battery out, then go about disconnecting the fuse box in order to finally get the battery tray out, what an effort. I couldnt find a decent guide to removing the MAF sensor but for reference on one side mine was in by 2x10mil bolts, one which is accessible from above, the other which isnt! So had to jack the car up and tackle one of the bolts from underneath. In order to access I had to take the lower turbo hose off, then unbolt the Pierburg VGT valve to pull aside which is bang in the way. With that done the other side of the MAF was on by a weird metal jubilee type clip that had a slot in. I managed to wedge it off and it pinged off. The MAF was now loose but still a bugger to get out, had to just wiggle free with a bit of brute force. When that was cleaned up I wedged it back in, but couldnt for the life of me get that metal clip back on, so did a bodge job with a plastic cable tie for now!
Im still waiting for the silicone vac hoses to arrive from ebay (btw halfrauds were charging £15 for a 5mm hose but got a 1m one off ebay for £1.82 free delivery!), but I noted the VGT actuator arm doesnt move on start-up/revving. I sucked on the hose from the actuator and the arm moved a fair bit so must be a vac problem.
Finally, a couple of questions...does the Pierburg valve's electical connection just pull off? I couldnt see a clip so tried yanking it off but couldnt get it unhooked? Once off I'll clean it up using that Polish link! To confirm, is the hose from the Pierburg valve to the VGT actuator arm the 3mm one and the hose from the vac resevoir the 5mm one? The latter no-one seemed to mention it goes on like a 3m convoluted path up by the battery tray meandering to the back of the engine which looks pretty much inaccessible! So hoping that one is ok. These hoses currently have a metal tie keeping them on the Pierburg, when/if I replace them do I need some form of tie to keep them on or should they be okay?
Bit of an essay that, but once sorted Im hoping she'll run like a dream as its been re-mapped to 190bhp!
Mines a 147 jtdm 150bhp btw