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1990/305 Engine/Trans Question

Discussion in 'GM Powertrain' started by Air Force One, Nov 19, 2009.

  1. Air Force One

    Air Force One New Member

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    Just had my 1990 Chevy 305 Engine Fuel Pump replaced since it was surging up/down and running erractically. Before this the trans was shfiting very hard from 1st to 2nd,,, seemed to shift a little smoother when it warmed. Now since the fuel pump has been replaced and the engine runs perfect it nows shifts 100% better. Anyway the fuel pump could have done that makes it shift smoother now??? Stumped! Thanks:rofl::sign0018:
    #1
  2. azdrtdog

    azdrtdog New Member

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    YES you have a t.p.s. throttle position sensor that tells the tranny how hard to shift dep. on throttle pos.the weak fuel pump made the motor run weak/ more throttle than nesc. when running strong harder shift
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