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My Passat 130 TDI which I've had from new is lacking power prior to the turbo cutting in. For example where I would drive up hill in top gear I now have to change gear and get the turbo to cut in to accelerate up the hill. I've changed the MAF, Fuel Filter, Air Filter and the Water Temp Sensor (on the rear of the cylinder head) all to no avail.
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I'd suspect a vacuum leak in one of the vacuum hoses, or a faulty N75 valve (the one that controls the VNT), or a faulty N18 (the one that controls the EGR).
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