PopeyeVRS

would be worth also checking the tailgate wiring loom. On some cars they are notorious for fraying and chafing wires where it comes through the car body and into the tailgate. I believe that how the loom gets to the high level brake light

I had a similar issue with a previous car, so take this with a pinch of salt. One of the rear brake light bulbs had shorted in a way that brought the brake lights on permanently. I know you said you’ve replaced the bulbs, but have you tried unplugging the high level brake light? Apparently they can get wet and that would cause a short

no doubt i will, just wanted it running right. Its about due a service so ill do it then Edit : Just to update, it hasnt stuttered once since i changed the N75 valve, smooth power all the way through. Thanks to all for the suggestions!!

just to update this, ive been looking into getting a copy of VCDS. In the meantime, the N75 valve could be the culprit. For the sake of £30 its worth a go looks a bit of a sod to get to!! Edit : Correction, it IS a sod to get to!!! Changed N75 and the small hoses, what an absolute pain on a job if you dont have small hands. Anyway, first drive out and the power held strong right through the rev range. Looks promising.

It’s a ccza. That’s what is strange about the whole issue. If I get it over 3k before flooring in any gear you’d never know there was an issue. I’ve even tried cable tying the actuator for the runner flaps in case they were causing an obstruction. you can watch the boost drop slightly and return strong. il l try to get a video later if i can find a way to mount my phone

I’ve done some live data this evening, fuel rail pressure holds rock steady around 2100 psi which is just under 145 bar. Not sure if this is too high? when the power dips, boost and MAF values drop which I would expect. I can hear the DV activate when the power dips. Overall MAF reading hit 200 so I’m convinced whatever the issue is it isn’t serious.

its on 95k. Thats the second recommendation for cleaning inlet valves, i havent checked the injectors but i have checked rail pressure after i switch the engine off. it goes up slightly as i would expect. The fuel pressure does not drop off as if an injector was leaking but ill check first thing tomorrow. If pressure is zero ill know theres a leak. I would have thought i would get a misfire if either were that far gone tbh, but idle is rock steady and it really takes off later in the rev band.

It did this before I replaced the air filter so I’m reasonably sure it’s nothing to do with it. Plus it’s making very good peak power above 3k

Air filter is only a few months old, ramair foam one

Hi all, so my VRS has a weird issue and im at my wits end with it. Between 2 and 3k rpm if i floor it, the power comes and goes a few times, then when it clears the car picks up and pulls hard to redline. If i roll onto the throttle, there are no power dips and it just pulls hard. Mostly evident in 3rd and above. if im over 3k and floor it, the car picks up like it should. i have done various "tests" and replaced some parts to try to diagnose, I've also got limited info from live data using the torque app. I've replaced : - Diverter valve - now has Rev G fitted. Previously had a Rev C piston type, made no difference Coil packs and spark plugs - Had a misfire under load on one cylinder. Replaced coil pack, no misfires since Evap purge valve - came up with a Po441 fault code. Probably unrelated to the "main fault", replaced valve and code hasnt come back I have tested a few bits : - MAF reading - Peaks at around 204 on average on a 3rd gear pull. Sometimes a few up, sometimes a few down but its similar every time. Due to this, i dont think its a garden variety boost leak, especially as its making that kind of power higher up the rev band than the dips. Uplugged MAF sensor - Less pronounced, but dips still there. Can't see any evidence of oil seepage around boost pipes. Any ideas? im thinking i might need a copy of VCDS to log data, but if it could be something simple ill try that before laying out £200 without fixing it