Quote:
Originally Posted by Mxfrank
+1 The wastegate servo is serviceable, as are the vacuum elements that control it. Sometimes the wastegate itself becomes stuck, and 50/50 you can free it up on the car rather than having to R&R.
Actually, that assumes (always bad) that the problem is low turbo pressure. The most common problem on these engines is a clogged pressure sense take-off. Look on the left side of your intake manifold. Find the large sensor. Just below that, you'll find a hose connected to a screw-in fitting. Remove the hose, undo the fitting and clean it out, replace with the hose. I bet you find your mojo. Mechanics these days have forgotten all the oddities of working on old diesels.
If you want to do a pressure test, just attach your pressure gauge to the fitting described above. Easy.
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I did clean those out previously, but it didn't help. I also stuck a small nail in that area and there's a bunch of gunk in there. So even with the sensor cleaned, it probably gets reclogged again because the gunk in the manifold is there to help replug it. I'm trying to clean the manifold now, if I could just get the crossover elbow tube up and out.