Join Date: Oct 2007
Location: Phoenix, AZ
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I had a 180 pump that was balanced with 022 DVs that had a bit of a funky idle. Only when in N or P. D would smooth it out. I wanted to try a set of 181s in it to experiment but ended up with a 215 pump instead. Since then ive come to the conclusion that DVs can absolutely affect idle quality.
However these minor performance upgrade DVs shouldn't affect idle on an otherwise healthy pump. At 275k it is possible the pump is just enough out of balance to show itself with a larger DV. I think as well these 160HP pumps are more finicky than the rest. (E.g. higher tolerances in P&B) Did the idle clean up any if you raised engine RPM slightly? You may be abke to get away with adjusting the low idle stop.
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91.0 D250 A727 w/ 216k on the clock. i/p replaced 20k ago, lift pump 2k, 1 turn fuel, 2 turns smoke, ground & polished AFC pin, timing bump, 366 spring 94 2500 4x4, 49k miles, Farrell Diesel rebuilt 215 pump, PDD 5x12 SAC, SXE 362, built 47RH