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'88 5000CD TQW engine knocking
>Does anyone have the answer to this?
>Intermittently, the digital boost guage will stop functioning and read
>0.0, or 0.1
>Once this happens, the engine will knock under hard acceleration
>(pinging begins at about 3800rpm). No warning lights come on.
>When the boost guage is functioning properly everything is great!
i would guess you have an intermittent vacuum leak in the line that goes
from the mainfold to the computer..