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IP= Injection Pump (fuel pump)
Are you able to adjust the injection timing on that truck? If so increase the timing a degree or two, switching to Bio-D chemically increases the timing I do not know the specifics on that but it has been discussed on TDIclub. So if you have access to Bio give it a try up to maybe 20% and see if it changes the smoke.
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"It's not rocket surgery!" -MetroMPG
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