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Join Date: Feb 2017
Any fault codes at all?
I would double check all the vac hoses again, especially the small one coming off the boost solenoid under the engine cover - Give them a squeeze, any soft spots?
Remove boost solenoid and try blowing through it, I know you said it was replaced but worth checking that it’s not faulty?
Throttle unit, is this sticking? Was it removed and cleaned when you deswirled the manifold?
Easy to diagnose, tends to show up first above 2,000rpm (across the range when it's fully dead), simply unplug the sensor, and should give 'normal' performance. Sometimes associated with a bit of smoke. You may be able to get away with just giving the sensor a bit of a clean (spray cleaner, avoid touching it). A faulty MAF can be linked to a failed EGR, as it can send the EGR crazy as it tries to compensate.
Also only tends to be an issue when the car is warm, as the engine uses a default map up until it reaches operating temperature.
Last edited by Topic; 14-10-17 at 10:15.