krismoriah Posted March 29, 2013 Share Posted March 29, 2013 1988 RD688S E6 350 4V Truck was running great until recently started losing power up the same hill...used to pull it in 4th, now have to pull in 3rd. Same weights same variables. Air filter clean, new fuel filters, no leaks in air to air. Pulled the ends off the turbo, a little play back and forth, kind of hard to spin by hand..but no roughness felt.Since this is a hill issue, is there an aneroid valve in the pump? Should the tubine be easier to spin by hand? I dont have a boost gauge...so yes i need to get one..just trying to rule out the obvious first. Quote Link to comment Share on other sites More sharing options...
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